diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index f3b99043..33481caf 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -10,7 +10,7 @@ jobs:
       - name: Setup Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '2.7'
+          ruby-version: '3.0.0'
       - name: Build and run tests
         run: |
           gem install bundler
diff --git a/Gemfile.lock b/Gemfile.lock
index 640435b3..172853fb 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -1,10 +1,10 @@
 PATH
   remote: .
   specs:
-    xero-ruby (4.0.0)
+    xero-ruby (5.0.0)
       faraday (>= 2.0, < 3.0)
       json (~> 2.1, >= 2.1.0)
-      json-jwt (~> 1.5, >= 1.5.2)
+      json-jwt (~> 1.16, >= 1.16.3)
 
 GEM
   remote: https://rubygems.org/
diff --git a/docs/accounting/AccountingApi.md b/docs/accounting/AccountingApi.md
index 54cdfdd1..e43662fa 100644
--- a/docs/accounting/AccountingApi.md
+++ b/docs/accounting/AccountingApi.md
@@ -65,9 +65,12 @@ Method | HTTP request | Description
 [**delete_batch_payment_by_url_param**](AccountingApi.md#delete_batch_payment_by_url_param) | **POST** /BatchPayments/{BatchPaymentID} | Updates a specific batch payment for invoices and credit notes
 [**delete_contact_group_contact**](AccountingApi.md#delete_contact_group_contact) | **DELETE** /ContactGroups/{ContactGroupID}/Contacts/{ContactID} | Deletes a specific contact from a contact group using a unique contact Id
 [**delete_contact_group_contacts**](AccountingApi.md#delete_contact_group_contacts) | **DELETE** /ContactGroups/{ContactGroupID}/Contacts | Deletes all contacts from a specific contact group
+[**delete_credit_note_allocations**](AccountingApi.md#delete_credit_note_allocations) | **DELETE** /CreditNotes/{CreditNoteID}/Allocations/{AllocationID} | Deletes an Allocation from a Credit Note
 [**delete_item**](AccountingApi.md#delete_item) | **DELETE** /Items/{ItemID} | Deletes a specific item
 [**delete_linked_transaction**](AccountingApi.md#delete_linked_transaction) | **DELETE** /LinkedTransactions/{LinkedTransactionID} | Deletes a specific linked transactions (billable expenses)
+[**delete_overpayment_allocations**](AccountingApi.md#delete_overpayment_allocations) | **DELETE** /Overpayments/{OverpaymentID}/Allocations/{AllocationID} | Deletes an Allocation from an overpayment
 [**delete_payment**](AccountingApi.md#delete_payment) | **POST** /Payments/{PaymentID} | Updates a specific payment for invoices and credit notes
+[**delete_prepayment_allocations**](AccountingApi.md#delete_prepayment_allocations) | **DELETE** /Prepayments/{PrepaymentID}/Allocations/{AllocationID} | Deletes an Allocation from a Prepayment
 [**delete_tracking_category**](AccountingApi.md#delete_tracking_category) | **DELETE** /TrackingCategories/{TrackingCategoryID} | Deletes a specific tracking category
 [**delete_tracking_options**](AccountingApi.md#delete_tracking_options) | **DELETE** /TrackingCategories/{TrackingCategoryID}/Options/{TrackingOptionID} | Deletes a specific option for a specific tracking category
 [**email_invoice**](AccountingApi.md#email_invoice) | **POST** /Invoices/{InvoiceID}/Email | Sends a copy of a specific invoice to related contact via email
@@ -242,7 +245,7 @@ Method | HTTP request | Description
 
 ## create_account
 
-> Accounts create_account(xero_tenant_id, account)
+> Accounts create_account(xero_tenant_id, account, opts)
 
 Creates a new chart of accounts
 
@@ -273,9 +276,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 account = { "Code":"123456", "Name":"Foobar", "Type":"EXPENSE", "Description":"Hello World" } # Account | Account object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new chart of accounts
-  result = api_instance.create_account(xero_tenant_id, account)
+  result = api_instance.create_account(xero_tenant_id, account, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_account: #{e}"
@@ -289,6 +296,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **account** | [**Account**](Account.md)| Account object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -306,7 +314,7 @@ Name | Type | Description  | Notes
 
 ## create_account_attachment_by_file_name
 
-> Attachments create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+> Attachments create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts)
 
 Creates an attachment on a specific account
 
@@ -339,9 +347,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 account_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Account object
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an attachment on a specific account
-  result = api_instance.create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+  result = api_instance.create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_account_attachment_by_file_name: #{e}"
@@ -357,6 +369,7 @@ Name | Type | Description  | Notes
  **account_id** | [**String**](.md)| Unique identifier for Account object | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -374,7 +387,7 @@ Name | Type | Description  | Notes
 
 ## create_bank_transaction_attachment_by_file_name
 
-> Attachments create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+> Attachments create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts)
 
 Creates an attachment for a specific bank transaction by filename
 
@@ -407,9 +420,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transaction_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transaction
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an attachment for a specific bank transaction by filename
-  result = api_instance.create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+  result = api_instance.create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_bank_transaction_attachment_by_file_name: #{e}"
@@ -425,6 +442,7 @@ Name | Type | Description  | Notes
  **bank_transaction_id** | [**String**](.md)| Xero generated unique identifier for a bank transaction | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -442,7 +460,7 @@ Name | Type | Description  | Notes
 
 ## create_bank_transaction_history_record
 
-> HistoryRecords create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, history_records)
+> HistoryRecords create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, history_records, opts)
 
 Creates a history record for a specific bank transactions
 
@@ -474,9 +492,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transaction_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transaction
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific bank transactions
-  result = api_instance.create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, history_records)
+  result = api_instance.create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_bank_transaction_history_record: #{e}"
@@ -491,6 +513,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **bank_transaction_id** | [**String**](.md)| Xero generated unique identifier for a bank transaction | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -542,7 +565,9 @@ bank_transactions = { bankTransactions: [{ type: BankTransaction.TypeEnum.SPEND,
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -563,6 +588,7 @@ Name | Type | Description  | Notes
  **bank_transactions** | [**BankTransactions**](BankTransactions.md)| BankTransactions with an array of BankTransaction objects in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -580,7 +606,7 @@ Name | Type | Description  | Notes
 
 ## create_bank_transfer
 
-> BankTransfers create_bank_transfer(xero_tenant_id, bank_transfers)
+> BankTransfers create_bank_transfer(xero_tenant_id, bank_transfers, opts)
 
 Creates a bank transfer
 
@@ -611,9 +637,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transfers = { "BankTransfers": [ { "FromBankAccount": { "Code": "090", "Name": "My Savings", "AccountID": "00000000-0000-0000-0000-000000000000", "Type": "BANK", "BankAccountNumber": "123455", "Status": "ACTIVE", "BankAccountType": "BANK", "CurrencyCode": "USD", "TaxType": "NONE", "EnablePaymentsToAccount": false, "ShowInExpenseClaims": false, "Class": "ASSET", "ReportingCode": "ASS", "ReportingCodeName": "Assets", "HasAttachments": false, "UpdatedDateUTC": "2016-10-17T13:45:33.993-07:00" }, "ToBankAccount": { "Code": "088", "Name": "Business Wells Fargo", "AccountID": "00000000-0000-0000-0000-000000000000", "Type": "BANK", "BankAccountNumber": "123455", "Status": "ACTIVE", "BankAccountType": "BANK", "CurrencyCode": "USD", "TaxType": "NONE", "EnablePaymentsToAccount": false, "ShowInExpenseClaims": false, "Class": "ASSET", "ReportingCode": "ASS", "ReportingCodeName": "Assets", "HasAttachments": false, "UpdatedDateUTC": "2016-06-03T08:31:14.517-07:00" }, "Amount": "50.00", "FromIsReconciled": true, "ToIsReconciled": true, "Reference": "Sub 098801" } ] } # BankTransfers | BankTransfers with array of BankTransfer objects in request body
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a bank transfer
-  result = api_instance.create_bank_transfer(xero_tenant_id, bank_transfers)
+  result = api_instance.create_bank_transfer(xero_tenant_id, bank_transfers, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_bank_transfer: #{e}"
@@ -627,6 +657,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **bank_transfers** | [**BankTransfers**](BankTransfers.md)| BankTransfers with array of BankTransfer objects in request body | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -644,7 +675,7 @@ Name | Type | Description  | Notes
 
 ## create_bank_transfer_attachment_by_file_name
 
-> Attachments create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
+> Attachments create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts)
 
 
 
@@ -677,8 +708,12 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transfer_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transfer
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
-  result = api_instance.create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
+  result = api_instance.create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_bank_transfer_attachment_by_file_name: #{e}"
@@ -694,6 +729,7 @@ Name | Type | Description  | Notes
  **bank_transfer_id** | [**String**](.md)| Xero generated unique identifier for a bank transfer | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -711,7 +747,7 @@ Name | Type | Description  | Notes
 
 ## create_bank_transfer_history_record
 
-> HistoryRecords create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, history_records)
+> HistoryRecords create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, history_records, opts)
 
 Creates a history record for a specific bank transfer
 
@@ -743,9 +779,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transfer_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transfer
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific bank transfer
-  result = api_instance.create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, history_records)
+  result = api_instance.create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_bank_transfer_history_record: #{e}"
@@ -760,6 +800,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **bank_transfer_id** | [**String**](.md)| Xero generated unique identifier for a bank transfer | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -809,7 +850,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 batch_payments = { "BatchPayments": [ { "Account": { "AccountID": "00000000-0000-0000-0000-000000000000" }, "Reference": "ref", "Date": "2018-08-01", "Payments": [ { "Account": { "Code": "001" }, "Date": "2019-12-31", "Amount": 500, "Invoice": { "InvoiceID": "00000000-0000-0000-0000-000000000000", "LineItems": [], "Contact": {}, "Type": "ACCPAY" } } ] } ] } # BatchPayments | BatchPayments with an array of Payments in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -829,6 +872,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **batch_payments** | [**BatchPayments**](BatchPayments.md)| BatchPayments with an array of Payments in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -846,7 +890,7 @@ Name | Type | Description  | Notes
 
 ## create_batch_payment_history_record
 
-> HistoryRecords create_batch_payment_history_record(xero_tenant_id, batch_payment_id, history_records)
+> HistoryRecords create_batch_payment_history_record(xero_tenant_id, batch_payment_id, history_records, opts)
 
 Creates a history record for a specific batch payment
 
@@ -878,9 +922,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 batch_payment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for BatchPayment
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific batch payment
-  result = api_instance.create_batch_payment_history_record(xero_tenant_id, batch_payment_id, history_records)
+  result = api_instance.create_batch_payment_history_record(xero_tenant_id, batch_payment_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_batch_payment_history_record: #{e}"
@@ -895,6 +943,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **batch_payment_id** | [**String**](.md)| Unique identifier for BatchPayment | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -912,7 +961,7 @@ Name | Type | Description  | Notes
 
 ## create_branding_theme_payment_services
 
-> PaymentServices create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, payment_services)
+> PaymentServices create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, payment_services, opts)
 
 Creates a new custom payment service for a specific branding theme
 
@@ -944,9 +993,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 branding_theme_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Branding Theme
 payment_services = { "PaymentServices": [ { "PaymentServiceID": "54b3b4f6-0443-4fba-bcd1-61ec0c35ca55", "PaymentServiceName": "PayUpNow", "PaymentServiceUrl": "https://www.payupnow.com/", "PaymentServiceType": "Custom", "PayNowText": "Time To Pay" } ] } # PaymentServices | PaymentServices array with PaymentService object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new custom payment service for a specific branding theme
-  result = api_instance.create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, payment_services)
+  result = api_instance.create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, payment_services, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_branding_theme_payment_services: #{e}"
@@ -961,6 +1014,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **branding_theme_id** | [**String**](.md)| Unique identifier for a Branding Theme | 
  **payment_services** | [**PaymentServices**](PaymentServices.md)| PaymentServices array with PaymentService object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -978,7 +1032,7 @@ Name | Type | Description  | Notes
 
 ## create_contact_attachment_by_file_name
 
-> Attachments create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+> Attachments create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts)
 
 
 
@@ -1011,8 +1065,12 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
-  result = api_instance.create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+  result = api_instance.create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_contact_attachment_by_file_name: #{e}"
@@ -1028,6 +1086,7 @@ Name | Type | Description  | Notes
  **contact_id** | [**String**](.md)| Unique identifier for a Contact | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1045,7 +1104,7 @@ Name | Type | Description  | Notes
 
 ## create_contact_group
 
-> ContactGroups create_contact_group(xero_tenant_id, contact_groups)
+> ContactGroups create_contact_group(xero_tenant_id, contact_groups, opts)
 
 Creates a contact group
 
@@ -1076,9 +1135,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_groups = { "ContactGroups": [{ "Name": "VIPs" }]} # ContactGroups | ContactGroups with an array of names in request body
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a contact group
-  result = api_instance.create_contact_group(xero_tenant_id, contact_groups)
+  result = api_instance.create_contact_group(xero_tenant_id, contact_groups, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_contact_group: #{e}"
@@ -1092,6 +1155,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contact_groups** | [**ContactGroups**](ContactGroups.md)| ContactGroups with an array of names in request body | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1109,7 +1173,7 @@ Name | Type | Description  | Notes
 
 ## create_contact_group_contacts
 
-> Contacts create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts)
+> Contacts create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts, opts)
 
 Creates contacts to a specific contact group
 
@@ -1141,9 +1205,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_group_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact Group
 contacts = { "Contacts": [ { "ContactID": "a3675fc4-f8dd-4f03-ba5b-f1870566bcd7" }, { "ContactID": "4e1753b9-018a-4775-b6aa-1bc7871cfee3" } ] } # Contacts | Contacts with array of contacts specifying the ContactID to be added to ContactGroup in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates contacts to a specific contact group
-  result = api_instance.create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts)
+  result = api_instance.create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_contact_group_contacts: #{e}"
@@ -1158,6 +1226,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contact_group_id** | [**String**](.md)| Unique identifier for a Contact Group | 
  **contacts** | [**Contacts**](Contacts.md)| Contacts with array of contacts specifying the ContactID to be added to ContactGroup in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1175,7 +1244,7 @@ Name | Type | Description  | Notes
 
 ## create_contact_history
 
-> HistoryRecords create_contact_history(xero_tenant_id, contact_id, history_records)
+> HistoryRecords create_contact_history(xero_tenant_id, contact_id, history_records, opts)
 
 Creates a new history record for a specific contact
 
@@ -1207,9 +1276,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new history record for a specific contact
-  result = api_instance.create_contact_history(xero_tenant_id, contact_id, history_records)
+  result = api_instance.create_contact_history(xero_tenant_id, contact_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_contact_history: #{e}"
@@ -1224,6 +1297,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contact_id** | [**String**](.md)| Unique identifier for a Contact | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1273,7 +1347,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contacts = { "Contacts": [ { "ContactID": "3ff6d40c-af9a-40a3-89ce-3c1556a25591", "ContactStatus": "ACTIVE", "Name": "Foo9987", "EmailAddress": "sid32476@blah.com", "BankAccountDetails": "", "Addresses": [ { "AddressType": "STREET", "City": "", "Region": "", "PostalCode": "", "Country": "" }, { "AddressType": "POBOX", "City": "", "Region": "", "PostalCode": "", "Country": "" } ], "Phones": [ { "PhoneType": "DEFAULT", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "DDI", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "FAX", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "MOBILE", "PhoneNumber": "555-1212", "PhoneAreaCode": "415", "PhoneCountryCode": "" } ], "UpdatedDateUTC": "/Date(1551399321043+0000)/", "ContactGroups": [], "IsSupplier": false, "IsCustomer": false, "SalesTrackingCategories": [], "PurchasesTrackingCategories": [], "PaymentTerms": { "Bills": { "Day": 15, "Type": "OFCURRENTMONTH" }, "Sales": { "Day": 10, "Type": "DAYSAFTERBILLMONTH" } }, "ContactPersons": [] } ] } # Contacts | Contacts with an array of Contact objects to create in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1293,6 +1369,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contacts** | [**Contacts**](Contacts.md)| Contacts with an array of Contact objects to create in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1343,7 +1420,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Credit Note
 allocations = { "Allocations": [ { "Invoice": { "LineItems": [], "InvoiceID": "c45720a1-ade3-4a38-a064-d15489be6841" }, "Amount": 1, "Date": "2019-03-05" } ] } # Allocations | Allocations with array of Allocation object in body of request.
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1364,6 +1443,7 @@ Name | Type | Description  | Notes
  **credit_note_id** | [**String**](.md)| Unique identifier for a Credit Note | 
  **allocations** | [**Allocations**](Allocations.md)| Allocations with array of Allocation object in body of request. | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1415,7 +1495,9 @@ credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identi
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
 opts = {
-  include_online: false # Boolean | Allows an attachment to be seen by the end customer within their online invoice
+  include_online: false, # Boolean | Allows an attachment to be seen by the end customer within their online invoice
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1437,6 +1519,7 @@ Name | Type | Description  | Notes
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
  **include_online** | **Boolean**| Allows an attachment to be seen by the end customer within their online invoice | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1454,7 +1537,7 @@ Name | Type | Description  | Notes
 
 ## create_credit_note_history
 
-> HistoryRecords create_credit_note_history(xero_tenant_id, credit_note_id, history_records)
+> HistoryRecords create_credit_note_history(xero_tenant_id, credit_note_id, history_records, opts)
 
 Retrieves history records of a specific credit note
 
@@ -1486,9 +1569,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Credit Note
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Retrieves history records of a specific credit note
-  result = api_instance.create_credit_note_history(xero_tenant_id, credit_note_id, history_records)
+  result = api_instance.create_credit_note_history(xero_tenant_id, credit_note_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_credit_note_history: #{e}"
@@ -1503,6 +1590,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **credit_note_id** | [**String**](.md)| Unique identifier for a Credit Note | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1554,7 +1642,9 @@ credit_notes = { "CreditNotes":[ { "Type":"ACCPAYCREDIT", "Contact":{ "ContactID
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1575,6 +1665,7 @@ Name | Type | Description  | Notes
  **credit_notes** | [**CreditNotes**](CreditNotes.md)| Credit Notes with array of CreditNote object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1592,7 +1683,7 @@ Name | Type | Description  | Notes
 
 ## create_currency
 
-> Currencies create_currency(xero_tenant_id, currency)
+> Currencies create_currency(xero_tenant_id, currency, opts)
 
 Create a new currency for a Xero organisation
 
@@ -1623,9 +1714,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 currency = { "Code": "USD", "Description": "United States Dollar" } # Currency | Currency object in the body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Create a new currency for a Xero organisation
-  result = api_instance.create_currency(xero_tenant_id, currency)
+  result = api_instance.create_currency(xero_tenant_id, currency, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_currency: #{e}"
@@ -1639,6 +1734,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **currency** | [**Currency**](Currency.md)| Currency object in the body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1688,7 +1784,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 employees = { "Employees": [ { "FirstName": "Nick", "LastName": "Fury", "ExternalLink": { "Url": "http://twitter.com/#!/search/Nick+Fury" } } ] } # Employees | Employees with array of Employee object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1708,6 +1806,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employees** | [**Employees**](Employees.md)| Employees with array of Employee object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1725,7 +1824,7 @@ Name | Type | Description  | Notes
 
 ## create_expense_claim_history
 
-> HistoryRecords create_expense_claim_history(xero_tenant_id, expense_claim_id, history_records)
+> HistoryRecords create_expense_claim_history(xero_tenant_id, expense_claim_id, history_records, opts)
 
 Creates a history record for a specific expense claim
 
@@ -1757,9 +1856,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 expense_claim_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ExpenseClaim
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific expense claim
-  result = api_instance.create_expense_claim_history(xero_tenant_id, expense_claim_id, history_records)
+  result = api_instance.create_expense_claim_history(xero_tenant_id, expense_claim_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_expense_claim_history: #{e}"
@@ -1774,6 +1877,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **expense_claim_id** | [**String**](.md)| Unique identifier for a ExpenseClaim | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1791,7 +1895,7 @@ Name | Type | Description  | Notes
 
 ## create_expense_claims
 
-> ExpenseClaims create_expense_claims(xero_tenant_id, expense_claims)
+> ExpenseClaims create_expense_claims(xero_tenant_id, expense_claims, opts)
 
 Creates expense claims
 
@@ -1822,9 +1926,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 expense_claims = { "ExpenseClaims": [ { "Status": "SUBMITTED", "User": { "UserID": "d1164823-0ac1-41ad-987b-b4e30fe0b273" }, "Receipts": [ { "Lineitems": [], "ReceiptID": "dc1c7f6d-0a4c-402f-acac-551d62ce5816" } ] } ] } # ExpenseClaims | ExpenseClaims with array of ExpenseClaim object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates expense claims
-  result = api_instance.create_expense_claims(xero_tenant_id, expense_claims)
+  result = api_instance.create_expense_claims(xero_tenant_id, expense_claims, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_expense_claims: #{e}"
@@ -1838,6 +1946,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **expense_claims** | [**ExpenseClaims**](ExpenseClaims.md)| ExpenseClaims with array of ExpenseClaim object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1889,7 +1998,9 @@ invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
 opts = {
-  include_online: false # Boolean | Allows an attachment to be seen by the end customer within their online invoice
+  include_online: false, # Boolean | Allows an attachment to be seen by the end customer within their online invoice
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -1911,6 +2022,7 @@ Name | Type | Description  | Notes
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
  **include_online** | **Boolean**| Allows an attachment to be seen by the end customer within their online invoice | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1928,7 +2040,7 @@ Name | Type | Description  | Notes
 
 ## create_invoice_history
 
-> HistoryRecords create_invoice_history(xero_tenant_id, invoice_id, history_records)
+> HistoryRecords create_invoice_history(xero_tenant_id, invoice_id, history_records, opts)
 
 Creates a history record for a specific invoice
 
@@ -1960,9 +2072,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Invoice
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific invoice
-  result = api_instance.create_invoice_history(xero_tenant_id, invoice_id, history_records)
+  result = api_instance.create_invoice_history(xero_tenant_id, invoice_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_invoice_history: #{e}"
@@ -1977,6 +2093,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **invoice_id** | [**String**](.md)| Unique identifier for an Invoice | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2028,7 +2145,9 @@ invoices = { "Invoices": [ { "Type": "ACCREC", "Contact": { "ContactID": "430fa1
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2049,6 +2168,7 @@ Name | Type | Description  | Notes
  **invoices** | [**Invoices**](Invoices.md)| Invoices with an array of invoice objects in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2066,7 +2186,7 @@ Name | Type | Description  | Notes
 
 ## create_item_history
 
-> HistoryRecords create_item_history(xero_tenant_id, item_id, history_records)
+> HistoryRecords create_item_history(xero_tenant_id, item_id, history_records, opts)
 
 Creates a history record for a specific item
 
@@ -2098,9 +2218,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 item_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Item
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific item
-  result = api_instance.create_item_history(xero_tenant_id, item_id, history_records)
+  result = api_instance.create_item_history(xero_tenant_id, item_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_item_history: #{e}"
@@ -2115,6 +2239,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **item_id** | [**String**](.md)| Unique identifier for an Item | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2166,7 +2291,9 @@ items = { "Items": [ { "Code": "code123", "Name": "Item Name XYZ", "Description"
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2187,6 +2314,7 @@ Name | Type | Description  | Notes
  **items** | [**Items**](Items.md)| Items with an array of Item objects in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2204,7 +2332,7 @@ Name | Type | Description  | Notes
 
 ## create_linked_transaction
 
-> LinkedTransactions create_linked_transaction(xero_tenant_id, linked_transaction)
+> LinkedTransactions create_linked_transaction(xero_tenant_id, linked_transaction, opts)
 
 Creates linked transactions (billable expenses)
 
@@ -2235,9 +2363,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 linked_transaction = { "LinkedTransactions": [ { "SourceTransactionID": "a848644a-f20f-4630-98c3-386bd7505631", "SourceLineItemID": "b0df260d-3cc8-4ced-9bd6-41924f624ed3" } ] } # LinkedTransaction | LinkedTransaction object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates linked transactions (billable expenses)
-  result = api_instance.create_linked_transaction(xero_tenant_id, linked_transaction)
+  result = api_instance.create_linked_transaction(xero_tenant_id, linked_transaction, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_linked_transaction: #{e}"
@@ -2251,6 +2383,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **linked_transaction** | [**LinkedTransaction**](LinkedTransaction.md)| LinkedTransaction object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2268,7 +2401,7 @@ Name | Type | Description  | Notes
 
 ## create_manual_journal_attachment_by_file_name
 
-> Attachments create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+> Attachments create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts)
 
 Creates a specific attachment for a specific manual journal by file name
 
@@ -2301,9 +2434,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journal_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ManualJournal
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a specific attachment for a specific manual journal by file name
-  result = api_instance.create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+  result = api_instance.create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_manual_journal_attachment_by_file_name: #{e}"
@@ -2319,6 +2456,7 @@ Name | Type | Description  | Notes
  **manual_journal_id** | [**String**](.md)| Unique identifier for a ManualJournal | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2336,7 +2474,7 @@ Name | Type | Description  | Notes
 
 ## create_manual_journal_history_record
 
-> HistoryRecords create_manual_journal_history_record(xero_tenant_id, manual_journal_id, history_records)
+> HistoryRecords create_manual_journal_history_record(xero_tenant_id, manual_journal_id, history_records, opts)
 
 Creates a history record for a specific manual journal
 
@@ -2368,9 +2506,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journal_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ManualJournal
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific manual journal
-  result = api_instance.create_manual_journal_history_record(xero_tenant_id, manual_journal_id, history_records)
+  result = api_instance.create_manual_journal_history_record(xero_tenant_id, manual_journal_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_manual_journal_history_record: #{e}"
@@ -2385,6 +2527,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **manual_journal_id** | [**String**](.md)| Unique identifier for a ManualJournal | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2434,7 +2577,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journals = { "ManualJournals": [ { "Narration": "Journal Desc", "JournalLines": [ { "LineAmount": 100, "AccountCode": "400", "Description": "Money Movement" }, { "LineAmount": -100, "AccountCode": "400", "Description": "Prepayment of things", "Tracking": [ { "Name": "North", "Option": "Region" } ] } ], "Date": "2019-03-14" } ] } # ManualJournals | ManualJournals array with ManualJournal object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2454,6 +2599,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **manual_journals** | [**ManualJournals**](ManualJournals.md)| ManualJournals array with ManualJournal object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2504,7 +2650,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 overpayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Overpayment
 allocations = { "Allocations": [ { "Invoice": { "InvoiceID": "00000000-0000-0000-0000-000000000000", "LineItems": [], "Contact": {}, "Type": "ACCPAY" }, "Amount": 10.00, "Date": "2019-03-12" } ] } # Allocations | Allocations array with Allocation object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2525,6 +2673,7 @@ Name | Type | Description  | Notes
  **overpayment_id** | [**String**](.md)| Unique identifier for a Overpayment | 
  **allocations** | [**Allocations**](Allocations.md)| Allocations array with Allocation object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2542,7 +2691,7 @@ Name | Type | Description  | Notes
 
 ## create_overpayment_history
 
-> HistoryRecords create_overpayment_history(xero_tenant_id, overpayment_id, history_records)
+> HistoryRecords create_overpayment_history(xero_tenant_id, overpayment_id, history_records, opts)
 
 Creates a history record for a specific overpayment
 
@@ -2574,9 +2723,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 overpayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Overpayment
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific overpayment
-  result = api_instance.create_overpayment_history(xero_tenant_id, overpayment_id, history_records)
+  result = api_instance.create_overpayment_history(xero_tenant_id, overpayment_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_overpayment_history: #{e}"
@@ -2591,6 +2744,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **overpayment_id** | [**String**](.md)| Unique identifier for a Overpayment | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2608,7 +2762,7 @@ Name | Type | Description  | Notes
 
 ## create_payment
 
-> Payments create_payment(xero_tenant_id, payment)
+> Payments create_payment(xero_tenant_id, payment, opts)
 
 Creates a single payment for invoice or credit notes
 
@@ -2639,9 +2793,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 payment = { "Payments": [ { "Invoice": { "LineItems": [], "InvoiceID": "00000000-0000-0000-0000-000000000000" }, "Account": { "Code": "970" }, "Date": "2019-03-12", "Amount": 1 } ] } # Payment | Request body with a single Payment object
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a single payment for invoice or credit notes
-  result = api_instance.create_payment(xero_tenant_id, payment)
+  result = api_instance.create_payment(xero_tenant_id, payment, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_payment: #{e}"
@@ -2655,6 +2813,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payment** | [**Payment**](Payment.md)| Request body with a single Payment object | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2672,7 +2831,7 @@ Name | Type | Description  | Notes
 
 ## create_payment_history
 
-> HistoryRecords create_payment_history(xero_tenant_id, payment_id, history_records)
+> HistoryRecords create_payment_history(xero_tenant_id, payment_id, history_records, opts)
 
 Creates a history record for a specific payment
 
@@ -2704,9 +2863,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 payment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Payment
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific payment
-  result = api_instance.create_payment_history(xero_tenant_id, payment_id, history_records)
+  result = api_instance.create_payment_history(xero_tenant_id, payment_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_payment_history: #{e}"
@@ -2721,6 +2884,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payment_id** | [**String**](.md)| Unique identifier for a Payment | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2738,7 +2902,7 @@ Name | Type | Description  | Notes
 
 ## create_payment_service
 
-> PaymentServices create_payment_service(xero_tenant_id, payment_services)
+> PaymentServices create_payment_service(xero_tenant_id, payment_services, opts)
 
 Creates a payment service
 
@@ -2769,9 +2933,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 payment_services = { "PaymentServices": [ { "PaymentServiceName": "PayUpNow", "PaymentServiceUrl": "https://www.payupnow.com/", "PayNowText": "Time To Pay" } ] } # PaymentServices | PaymentServices array with PaymentService object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a payment service
-  result = api_instance.create_payment_service(xero_tenant_id, payment_services)
+  result = api_instance.create_payment_service(xero_tenant_id, payment_services, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_payment_service: #{e}"
@@ -2785,6 +2953,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payment_services** | [**PaymentServices**](PaymentServices.md)| PaymentServices array with PaymentService object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2834,7 +3003,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 payments = { "Payments": [ { "Invoice": { "LineItems": [], "InvoiceID": "00000000-0000-0000-0000-000000000000" }, "Account": { "Code": "970" }, "Date": "2019-03-12", "Amount": 1 } ] } # Payments | Payments array with Payment object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2854,6 +3025,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payments** | [**Payments**](Payments.md)| Payments array with Payment object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2904,7 +3076,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 prepayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a PrePayment
 allocations = { "Allocations": [ { "Invoice": { "LineItems": [], "InvoiceID": "00000000-0000-0000-0000-000000000000" }, "Amount": 1, "Date": "2019-01-10" } ] } # Allocations | Allocations with an array of Allocation object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -2925,6 +3099,7 @@ Name | Type | Description  | Notes
  **prepayment_id** | [**String**](.md)| Unique identifier for a PrePayment | 
  **allocations** | [**Allocations**](Allocations.md)| Allocations with an array of Allocation object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2942,7 +3117,7 @@ Name | Type | Description  | Notes
 
 ## create_prepayment_history
 
-> HistoryRecords create_prepayment_history(xero_tenant_id, prepayment_id, history_records)
+> HistoryRecords create_prepayment_history(xero_tenant_id, prepayment_id, history_records, opts)
 
 Creates a history record for a specific prepayment
 
@@ -2974,9 +3149,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 prepayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a PrePayment
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific prepayment
-  result = api_instance.create_prepayment_history(xero_tenant_id, prepayment_id, history_records)
+  result = api_instance.create_prepayment_history(xero_tenant_id, prepayment_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_prepayment_history: #{e}"
@@ -2991,6 +3170,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **prepayment_id** | [**String**](.md)| Unique identifier for a PrePayment | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3008,7 +3188,7 @@ Name | Type | Description  | Notes
 
 ## create_purchase_order_attachment_by_file_name
 
-> Attachments create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+> Attachments create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts)
 
 Creates attachment for a specific purchase order
 
@@ -3041,9 +3221,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_order_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Purchase Order
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates attachment for a specific purchase order
-  result = api_instance.create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+  result = api_instance.create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_purchase_order_attachment_by_file_name: #{e}"
@@ -3059,6 +3243,7 @@ Name | Type | Description  | Notes
  **purchase_order_id** | [**String**](.md)| Unique identifier for an Purchase Order | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3076,7 +3261,7 @@ Name | Type | Description  | Notes
 
 ## create_purchase_order_history
 
-> HistoryRecords create_purchase_order_history(xero_tenant_id, purchase_order_id, history_records)
+> HistoryRecords create_purchase_order_history(xero_tenant_id, purchase_order_id, history_records, opts)
 
 Creates a history record for a specific purchase orders
 
@@ -3108,9 +3293,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_order_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Purchase Order
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific purchase orders
-  result = api_instance.create_purchase_order_history(xero_tenant_id, purchase_order_id, history_records)
+  result = api_instance.create_purchase_order_history(xero_tenant_id, purchase_order_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_purchase_order_history: #{e}"
@@ -3125,6 +3314,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **purchase_order_id** | [**String**](.md)| Unique identifier for an Purchase Order | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3174,7 +3364,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_orders = { "PurchaseOrders": [ { "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "LineItems": [ { "Description": "Foobar", "Quantity": 1, "UnitAmount": 20, "AccountCode": "710" } ], "Date": "2019-03-13" } ] } # PurchaseOrders | PurchaseOrders with an array of PurchaseOrder object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -3194,6 +3386,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **purchase_orders** | [**PurchaseOrders**](PurchaseOrders.md)| PurchaseOrders with an array of PurchaseOrder object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3211,7 +3404,7 @@ Name | Type | Description  | Notes
 
 ## create_quote_attachment_by_file_name
 
-> Attachments create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+> Attachments create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts)
 
 Creates attachment for a specific quote
 
@@ -3244,9 +3437,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quote_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Quote
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates attachment for a specific quote
-  result = api_instance.create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+  result = api_instance.create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_quote_attachment_by_file_name: #{e}"
@@ -3262,6 +3459,7 @@ Name | Type | Description  | Notes
  **quote_id** | [**String**](.md)| Unique identifier for an Quote | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3279,7 +3477,7 @@ Name | Type | Description  | Notes
 
 ## create_quote_history
 
-> HistoryRecords create_quote_history(xero_tenant_id, quote_id, history_records)
+> HistoryRecords create_quote_history(xero_tenant_id, quote_id, history_records, opts)
 
 Creates a history record for a specific quote
 
@@ -3311,9 +3509,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quote_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Quote
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific quote
-  result = api_instance.create_quote_history(xero_tenant_id, quote_id, history_records)
+  result = api_instance.create_quote_history(xero_tenant_id, quote_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_quote_history: #{e}"
@@ -3328,6 +3530,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **quote_id** | [**String**](.md)| Unique identifier for an Quote | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3377,7 +3580,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quotes = { "Quotes": [ { "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "LineItems": [ { "Description": "Foobar", "Quantity": 1, "UnitAmount": 20, "AccountCode": "12775" } ], "Date": "2020-02-01" } ] } # Quotes | Quotes with an array of Quote object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -3397,6 +3602,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **quotes** | [**Quotes**](Quotes.md)| Quotes with an array of Quote object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3446,7 +3652,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 receipts = { "Receipts": [ { "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "Lineitems": [ { "Description": "Foobar", "Quantity": 2, "UnitAmount": 20, "AccountCode": "400", "TaxType": "NONE", "LineAmount": 40 } ], "User": { "UserID": "00000000-0000-0000-0000-000000000000" }, "LineAmountTypes": "NoTax", "Status": "DRAFT" } ] } # Receipts | Receipts with an array of Receipt object in body of request
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -3466,6 +3674,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **receipts** | [**Receipts**](Receipts.md)| Receipts with an array of Receipt object in body of request | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3483,7 +3692,7 @@ Name | Type | Description  | Notes
 
 ## create_receipt_attachment_by_file_name
 
-> Attachments create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
+> Attachments create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts)
 
 Creates an attachment on a specific expense claim receipts by file name
 
@@ -3516,9 +3725,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 receipt_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Receipt
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an attachment on a specific expense claim receipts by file name
-  result = api_instance.create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
+  result = api_instance.create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_receipt_attachment_by_file_name: #{e}"
@@ -3534,6 +3747,7 @@ Name | Type | Description  | Notes
  **receipt_id** | [**String**](.md)| Unique identifier for a Receipt | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3551,7 +3765,7 @@ Name | Type | Description  | Notes
 
 ## create_receipt_history
 
-> HistoryRecords create_receipt_history(xero_tenant_id, receipt_id, history_records)
+> HistoryRecords create_receipt_history(xero_tenant_id, receipt_id, history_records, opts)
 
 Creates a history record for a specific receipt
 
@@ -3583,9 +3797,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 receipt_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Receipt
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a history record for a specific receipt
-  result = api_instance.create_receipt_history(xero_tenant_id, receipt_id, history_records)
+  result = api_instance.create_receipt_history(xero_tenant_id, receipt_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_receipt_history: #{e}"
@@ -3600,6 +3818,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **receipt_id** | [**String**](.md)| Unique identifier for a Receipt | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3617,7 +3836,7 @@ Name | Type | Description  | Notes
 
 ## create_repeating_invoice_attachment_by_file_name
 
-> Attachments create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+> Attachments create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
 
 Creates an attachment from a specific repeating invoices by file name
 
@@ -3650,9 +3869,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Repeating Invoice
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an attachment from a specific repeating invoices by file name
-  result = api_instance.create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+  result = api_instance.create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_repeating_invoice_attachment_by_file_name: #{e}"
@@ -3668,6 +3891,7 @@ Name | Type | Description  | Notes
  **repeating_invoice_id** | [**String**](.md)| Unique identifier for a Repeating Invoice | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3685,7 +3909,7 @@ Name | Type | Description  | Notes
 
 ## create_repeating_invoice_history
 
-> HistoryRecords create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, history_records)
+> HistoryRecords create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, history_records, opts)
 
 Creates a  history record for a specific repeating invoice
 
@@ -3717,9 +3941,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Repeating Invoice
 history_records = { "HistoryRecords": [ { "Details": "Hello World" } ] } # HistoryRecords | HistoryRecords containing an array of HistoryRecord objects in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a  history record for a specific repeating invoice
-  result = api_instance.create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, history_records)
+  result = api_instance.create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, history_records, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_repeating_invoice_history: #{e}"
@@ -3734,6 +3962,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **repeating_invoice_id** | [**String**](.md)| Unique identifier for a Repeating Invoice | 
  **history_records** | [**HistoryRecords**](HistoryRecords.md)| HistoryRecords containing an array of HistoryRecord objects in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3783,7 +4012,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoices = { "RepeatingInvoices": [ { "Schedule": { "Period": 1, "Unit": "MONTHLY", "DueDate": 10, "DueDateType": "OFFOLLOWINGMONTH", "StartDate": "\/Date(1555286400000+0000)\/" }, "Type": "ACCREC", "Reference": "[Week]", "ApprovedForSending": false, "SendCopy": false, "MarkAsSent": false, "IncludePDF": false, "Contact": { "ContactID": "430fa14a-f945-44d3-9f97-5df5e28441b8", "Name": "Liam Gallagher" }, "Status": "AUTHORISED", "LineAmountTypes": "Exclusive", "LineItems": [ { "Description": "Guitars Fender Strat", "UnitAmount": 5000.00, "TaxType": "OUTPUT2", "TaxAmount": 750.00, "LineAmount": 5000.00, "AccountCode": "200", "Tracking": [], "Quantity": 1.0000, "LineItemID": "13a8353c-d2af-4d5b-920c-438449f08900", "DiscountEnteredAsPercent": true } ], "CurrencyCode": "NZD" } ] } # RepeatingInvoices | RepeatingInvoices with an array of repeating invoice objects in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -3803,6 +4034,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **repeating_invoices** | [**RepeatingInvoices**](RepeatingInvoices.md)| RepeatingInvoices with an array of repeating invoice objects in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3820,7 +4052,7 @@ Name | Type | Description  | Notes
 
 ## create_tax_rates
 
-> TaxRates create_tax_rates(xero_tenant_id, tax_rates)
+> TaxRates create_tax_rates(xero_tenant_id, tax_rates, opts)
 
 Creates one or more tax rates
 
@@ -3851,9 +4083,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tax_rates = { "TaxRates": [ { "Name": "CA State Tax", "TaxComponents": [ { "Name": "State Tax", "Rate": 2.25 } ] } ] } # TaxRates | TaxRates array with TaxRate object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates one or more tax rates
-  result = api_instance.create_tax_rates(xero_tenant_id, tax_rates)
+  result = api_instance.create_tax_rates(xero_tenant_id, tax_rates, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_tax_rates: #{e}"
@@ -3867,6 +4103,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **tax_rates** | [**TaxRates**](TaxRates.md)| TaxRates array with TaxRate object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3884,7 +4121,7 @@ Name | Type | Description  | Notes
 
 ## create_tracking_category
 
-> TrackingCategories create_tracking_category(xero_tenant_id, tracking_category)
+> TrackingCategories create_tracking_category(xero_tenant_id, tracking_category, opts)
 
 Create tracking categories
 
@@ -3915,9 +4152,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tracking_category = { name: "FooBar" } # TrackingCategory | TrackingCategory object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Create tracking categories
-  result = api_instance.create_tracking_category(xero_tenant_id, tracking_category)
+  result = api_instance.create_tracking_category(xero_tenant_id, tracking_category, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_tracking_category: #{e}"
@@ -3931,6 +4172,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **tracking_category** | [**TrackingCategory**](TrackingCategory.md)| TrackingCategory object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3948,7 +4190,7 @@ Name | Type | Description  | Notes
 
 ## create_tracking_options
 
-> TrackingOptions create_tracking_options(xero_tenant_id, tracking_category_id, tracking_option)
+> TrackingOptions create_tracking_options(xero_tenant_id, tracking_category_id, tracking_option, opts)
 
 Creates options for a specific tracking category
 
@@ -3980,9 +4222,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tracking_category_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a TrackingCategory
 tracking_option = { name: " Bar" } # TrackingOption | TrackingOption object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates options for a specific tracking category
-  result = api_instance.create_tracking_options(xero_tenant_id, tracking_category_id, tracking_option)
+  result = api_instance.create_tracking_options(xero_tenant_id, tracking_category_id, tracking_option, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->create_tracking_options: #{e}"
@@ -3997,6 +4243,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **tracking_category_id** | [**String**](.md)| Unique identifier for a TrackingCategory | 
  **tracking_option** | [**TrackingOption**](TrackingOption.md)| TrackingOption object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4078,7 +4325,7 @@ Name | Type | Description  | Notes
 
 ## delete_batch_payment
 
-> BatchPayments delete_batch_payment(xero_tenant_id, batch_payment_delete)
+> BatchPayments delete_batch_payment(xero_tenant_id, batch_payment_delete, opts)
 
 Updates a specific batch payment for invoices and credit notes
 
@@ -4109,9 +4356,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 batch_payment_delete = { "BatchPaymentID": "9bf296e9-0748-4d29-a3dc-24dde1098030", "Status":"DELETED" } # BatchPaymentDelete | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific batch payment for invoices and credit notes
-  result = api_instance.delete_batch_payment(xero_tenant_id, batch_payment_delete)
+  result = api_instance.delete_batch_payment(xero_tenant_id, batch_payment_delete, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->delete_batch_payment: #{e}"
@@ -4125,6 +4376,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **batch_payment_delete** | [**BatchPaymentDelete**](BatchPaymentDelete.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4142,7 +4394,7 @@ Name | Type | Description  | Notes
 
 ## delete_batch_payment_by_url_param
 
-> BatchPayments delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param)
+> BatchPayments delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param, opts)
 
 Updates a specific batch payment for invoices and credit notes
 
@@ -4174,9 +4426,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 batch_payment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for BatchPayment
 batch_payment_delete_by_url_param = { "Status":"DELETED" } # BatchPaymentDeleteByUrlParam | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific batch payment for invoices and credit notes
-  result = api_instance.delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param)
+  result = api_instance.delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->delete_batch_payment_by_url_param: #{e}"
@@ -4191,6 +4447,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **batch_payment_id** | [**String**](.md)| Unique identifier for BatchPayment | 
  **batch_payment_delete_by_url_param** | [**BatchPaymentDeleteByUrlParam**](BatchPaymentDeleteByUrlParam.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4334,6 +4591,72 @@ nil (empty response body)
 - **Accept**: Not defined
 
 
+## delete_credit_note_allocations
+
+> Allocation delete_credit_note_allocations(xero_tenant_id, credit_note_id, allocation_id)
+
+Deletes an Allocation from a Credit Note
+
+### Example
+
+```ruby
+# load the gem
+require 'xero-ruby'
+
+creds = {
+  client_id: ENV['CLIENT_ID'],
+  client_secret: ENV['CLIENT_SECRET'],
+  redirect_uri: ENV['REDIRECT_URI'],
+  scopes: ENV['SCOPES']
+}
+xero_client = XeroRuby::ApiClient.new(credentials: creds)
+
+token_set = fetch_valid_token_set(user) # example
+
+xero_client.refresh_token_set(token_set)
+
+# You need to namespace your api method call to one of the following api sets
+# [:accounting_api, :assets_api, :projects_api, :files_api, :payroll_au_api, :payroll_nz_api, :payroll_uk_api, :app_store_api]
+
+api_instance = xero_client.<api_set>
+
+
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
+credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Credit Note
+allocation_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Allocation object
+begin
+  #Deletes an Allocation from a Credit Note
+  result = api_instance.delete_credit_note_allocations(xero_tenant_id, credit_note_id, allocation_id)
+  p result
+rescue XeroRuby::Accounting::ApiError => e
+  puts "Exception when calling AccountingApi->delete_credit_note_allocations: #{e}"
+end
+```
+
+### Parameters
+
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **xero_tenant_id** | **String**| Xero identifier for Tenant | 
+ **credit_note_id** | [**String**](.md)| Unique identifier for a Credit Note | 
+ **allocation_id** | [**String**](.md)| Unique identifier for Allocation object | 
+
+### Return type
+
+[**Allocation**](Allocation.md)
+
+### Authorization
+
+[OAuth2](../README.md#OAuth2)
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json
+
+
 ## delete_item
 
 > delete_item(xero_tenant_id, item_id)
@@ -4460,9 +4783,75 @@ nil (empty response body)
 - **Accept**: application/json
 
 
+## delete_overpayment_allocations
+
+> Allocation delete_overpayment_allocations(xero_tenant_id, overpayment_id, allocation_id)
+
+Deletes an Allocation from an overpayment
+
+### Example
+
+```ruby
+# load the gem
+require 'xero-ruby'
+
+creds = {
+  client_id: ENV['CLIENT_ID'],
+  client_secret: ENV['CLIENT_SECRET'],
+  redirect_uri: ENV['REDIRECT_URI'],
+  scopes: ENV['SCOPES']
+}
+xero_client = XeroRuby::ApiClient.new(credentials: creds)
+
+token_set = fetch_valid_token_set(user) # example
+
+xero_client.refresh_token_set(token_set)
+
+# You need to namespace your api method call to one of the following api sets
+# [:accounting_api, :assets_api, :projects_api, :files_api, :payroll_au_api, :payroll_nz_api, :payroll_uk_api, :app_store_api]
+
+api_instance = xero_client.<api_set>
+
+
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
+overpayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Overpayment
+allocation_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Allocation object
+begin
+  #Deletes an Allocation from an overpayment
+  result = api_instance.delete_overpayment_allocations(xero_tenant_id, overpayment_id, allocation_id)
+  p result
+rescue XeroRuby::Accounting::ApiError => e
+  puts "Exception when calling AccountingApi->delete_overpayment_allocations: #{e}"
+end
+```
+
+### Parameters
+
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **xero_tenant_id** | **String**| Xero identifier for Tenant | 
+ **overpayment_id** | [**String**](.md)| Unique identifier for a Overpayment | 
+ **allocation_id** | [**String**](.md)| Unique identifier for Allocation object | 
+
+### Return type
+
+[**Allocation**](Allocation.md)
+
+### Authorization
+
+[OAuth2](../README.md#OAuth2)
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json
+
+
 ## delete_payment
 
-> Payments delete_payment(xero_tenant_id, payment_id, payment_delete)
+> Payments delete_payment(xero_tenant_id, payment_id, payment_delete, opts)
 
 Updates a specific payment for invoices and credit notes
 
@@ -4494,9 +4883,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 payment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Payment
 payment_delete = { "Payments":[ { "Status":"DELETED" } ] } # PaymentDelete | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific payment for invoices and credit notes
-  result = api_instance.delete_payment(xero_tenant_id, payment_id, payment_delete)
+  result = api_instance.delete_payment(xero_tenant_id, payment_id, payment_delete, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->delete_payment: #{e}"
@@ -4511,6 +4904,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payment_id** | [**String**](.md)| Unique identifier for a Payment | 
  **payment_delete** | [**PaymentDelete**](PaymentDelete.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4526,6 +4920,72 @@ Name | Type | Description  | Notes
 - **Accept**: application/json
 
 
+## delete_prepayment_allocations
+
+> Allocation delete_prepayment_allocations(xero_tenant_id, prepayment_id, allocation_id)
+
+Deletes an Allocation from a Prepayment
+
+### Example
+
+```ruby
+# load the gem
+require 'xero-ruby'
+
+creds = {
+  client_id: ENV['CLIENT_ID'],
+  client_secret: ENV['CLIENT_SECRET'],
+  redirect_uri: ENV['REDIRECT_URI'],
+  scopes: ENV['SCOPES']
+}
+xero_client = XeroRuby::ApiClient.new(credentials: creds)
+
+token_set = fetch_valid_token_set(user) # example
+
+xero_client.refresh_token_set(token_set)
+
+# You need to namespace your api method call to one of the following api sets
+# [:accounting_api, :assets_api, :projects_api, :files_api, :payroll_au_api, :payroll_nz_api, :payroll_uk_api, :app_store_api]
+
+api_instance = xero_client.<api_set>
+
+
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
+prepayment_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a PrePayment
+allocation_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Allocation object
+begin
+  #Deletes an Allocation from a Prepayment
+  result = api_instance.delete_prepayment_allocations(xero_tenant_id, prepayment_id, allocation_id)
+  p result
+rescue XeroRuby::Accounting::ApiError => e
+  puts "Exception when calling AccountingApi->delete_prepayment_allocations: #{e}"
+end
+```
+
+### Parameters
+
+
+Name | Type | Description  | Notes
+------------- | ------------- | ------------- | -------------
+ **xero_tenant_id** | **String**| Xero identifier for Tenant | 
+ **prepayment_id** | [**String**](.md)| Unique identifier for a PrePayment | 
+ **allocation_id** | [**String**](.md)| Unique identifier for Allocation object | 
+
+### Return type
+
+[**Allocation**](Allocation.md)
+
+### Authorization
+
+[OAuth2](../README.md#OAuth2)
+
+### HTTP request headers
+
+- **Content-Type**: Not defined
+- **Accept**: application/json
+
+
 ## delete_tracking_category
 
 > TrackingCategories delete_tracking_category(xero_tenant_id, tracking_category_id)
@@ -4658,7 +5118,7 @@ Name | Type | Description  | Notes
 
 ## email_invoice
 
-> email_invoice(xero_tenant_id, invoice_id, request_empty)
+> email_invoice(xero_tenant_id, invoice_id, request_empty, opts)
 
 Sends a copy of a specific invoice to related contact via email
 
@@ -4690,9 +5150,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Invoice
 request_empty = {} # RequestEmpty | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Sends a copy of a specific invoice to related contact via email
-  api_instance.email_invoice(xero_tenant_id, invoice_id, request_empty)
+  api_instance.email_invoice(xero_tenant_id, invoice_id, request_empty, opts)
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->email_invoice: #{e}"
 end
@@ -4706,6 +5170,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **invoice_id** | [**String**](.md)| Unique identifier for an Invoice | 
  **request_empty** | [**RequestEmpty**](RequestEmpty.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13402,7 +13867,7 @@ Name | Type | Description  | Notes
 
 ## post_setup
 
-> ImportSummaryObject post_setup(xero_tenant_id, setup)
+> ImportSummaryObject post_setup(xero_tenant_id, setup, opts)
 
 Sets the chart of accounts, the conversion date and conversion balances
 
@@ -13433,9 +13898,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 setup = { "ConversionDate": {}, "ConversionBalances": [], "Accounts": [ { "Code": "200", "Name": "Sales", "Type": "SALES", "ReportingCode": "REV.TRA.GOO" }, { "Code": "400", "Name": "Advertising", "Type": "OVERHEADS", "ReportingCode": "EXP" }, { "Code": "610", "Name": "Accounts Receivable", "Type": "CURRENT", "SystemAccount": "DEBTORS", "ReportingCode": "ASS.CUR.REC.TRA" }, { "Code": "800", "Name": "Accounts Payable", "Type": "CURRLIAB", "SystemAccount": "CREDITORS", "ReportingCode": "LIA.CUR.PAY" } ] } # Setup | Object including an accounts array, a conversion balances array and a conversion date object in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Sets the chart of accounts, the conversion date and conversion balances
-  result = api_instance.post_setup(xero_tenant_id, setup)
+  result = api_instance.post_setup(xero_tenant_id, setup, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->post_setup: #{e}"
@@ -13449,6 +13918,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **setup** | [**Setup**](Setup.md)| Object including an accounts array, a conversion balances array and a conversion date object in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13466,7 +13936,7 @@ Name | Type | Description  | Notes
 
 ## update_account
 
-> Accounts update_account(xero_tenant_id, account_id, accounts)
+> Accounts update_account(xero_tenant_id, account_id, accounts, opts)
 
 Updates a chart of accounts
 
@@ -13498,9 +13968,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 account_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Account object
 accounts = { "Accounts":[ { "Code":"123456", "Name":"BarFoo", "AccountID":"99ce6032-0678-4aa0-8148-240c75fee33a", "Type":"EXPENSE", "Description":"GoodBye World", "TaxType":"INPUT", "EnablePaymentsToAccount":false, "ShowInExpenseClaims":false, "Class":"EXPENSE", "ReportingCode":"EXP", "ReportingCodeName":"Expense", "UpdatedDateUTC":"2019-02-21T16:29:47.96-08:00" } ] } # Accounts | Request of type Accounts array with one Account
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a chart of accounts
-  result = api_instance.update_account(xero_tenant_id, account_id, accounts)
+  result = api_instance.update_account(xero_tenant_id, account_id, accounts, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_account: #{e}"
@@ -13515,6 +13989,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **account_id** | [**String**](.md)| Unique identifier for Account object | 
  **accounts** | [**Accounts**](Accounts.md)| Request of type Accounts array with one Account | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13532,7 +14007,7 @@ Name | Type | Description  | Notes
 
 ## update_account_attachment_by_file_name
 
-> Attachments update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+> Attachments update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts)
 
 Updates attachment on a specific account by filename
 
@@ -13565,9 +14040,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 account_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Account object
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates attachment on a specific account by filename
-  result = api_instance.update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+  result = api_instance.update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_account_attachment_by_file_name: #{e}"
@@ -13583,6 +14062,7 @@ Name | Type | Description  | Notes
  **account_id** | [**String**](.md)| Unique identifier for Account object | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13633,7 +14113,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transaction_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transaction
 bank_transactions = { "BankTransactions": [ { "Type": "SPEND", "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000", "ContactStatus": "ACTIVE", "Name": "Buzz Lightyear", "FirstName": "Buzz", "LastName": "Lightyear", "EmailAddress": "buzz.Lightyear@email.com", "ContactPersons": [], "BankAccountDetails": "", "Addresses": [ { "AddressType": "STREET", "City": "", "Region": "", "PostalCode": "", "Country": "" }, { "AddressType": "POBOX", "AddressLine1": "", "AddressLine2": "", "AddressLine3": "", "AddressLine4": "", "City": "Palo Alto", "Region": "CA", "PostalCode": "94020", "Country": "United States" } ], "Phones": [ { "PhoneType": "DEFAULT", "PhoneNumber": "847-1294", "PhoneAreaCode": "(626)", "PhoneCountryCode": "" }, { "PhoneType": "DDI", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "FAX", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" }, { "PhoneType": "MOBILE", "PhoneNumber": "", "PhoneAreaCode": "", "PhoneCountryCode": "" } ], "UpdatedDateUTC": "2017-08-21T13:49:04.227-07:00", "ContactGroups": [] }, "Lineitems": [], "BankAccount": { "Code": "088", "Name": "Business Wells Fargo", "AccountID": "00000000-0000-0000-0000-000000000000" }, "IsReconciled": false, "Date": "2019-02-25", "Reference": "You just updated", "CurrencyCode": "USD", "CurrencyRate": 1, "Status": "AUTHORISED", "LineAmountTypes": "Inclusive", "TotalTax": 1.74, "BankTransactionID": "00000000-0000-0000-0000-000000000000", "UpdatedDateUTC": "2019-02-26T12:39:27.813-08:00" } ] } # BankTransactions | 
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -13654,6 +14136,7 @@ Name | Type | Description  | Notes
  **bank_transaction_id** | [**String**](.md)| Xero generated unique identifier for a bank transaction | 
  **bank_transactions** | [**BankTransactions**](BankTransactions.md)|  | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13671,7 +14154,7 @@ Name | Type | Description  | Notes
 
 ## update_bank_transaction_attachment_by_file_name
 
-> Attachments update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+> Attachments update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts)
 
 Updates a specific attachment from a specific bank transaction by filename
 
@@ -13704,9 +14187,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transaction_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transaction
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment from a specific bank transaction by filename
-  result = api_instance.update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+  result = api_instance.update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_bank_transaction_attachment_by_file_name: #{e}"
@@ -13722,6 +14209,7 @@ Name | Type | Description  | Notes
  **bank_transaction_id** | [**String**](.md)| Xero generated unique identifier for a bank transaction | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13739,7 +14227,7 @@ Name | Type | Description  | Notes
 
 ## update_bank_transfer_attachment_by_file_name
 
-> Attachments update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
+> Attachments update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts)
 
 
 
@@ -13772,8 +14260,12 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 bank_transfer_id = '00000000-0000-0000-0000-000000000000' # String | Xero generated unique identifier for a bank transfer
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
-  result = api_instance.update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
+  result = api_instance.update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_bank_transfer_attachment_by_file_name: #{e}"
@@ -13789,6 +14281,7 @@ Name | Type | Description  | Notes
  **bank_transfer_id** | [**String**](.md)| Xero generated unique identifier for a bank transfer | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13806,7 +14299,7 @@ Name | Type | Description  | Notes
 
 ## update_contact
 
-> Contacts update_contact(xero_tenant_id, contact_id, contacts)
+> Contacts update_contact(xero_tenant_id, contact_id, contacts, opts)
 
 Updates a specific contact in a Xero organisation
 
@@ -13838,9 +14331,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact
 contacts = { "Contacts": [{ "ContactID": "00000000-0000-0000-0000-000000000000", "Name": "Thanos" }]} # Contacts | an array of Contacts containing single Contact object with properties to update
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific contact in a Xero organisation
-  result = api_instance.update_contact(xero_tenant_id, contact_id, contacts)
+  result = api_instance.update_contact(xero_tenant_id, contact_id, contacts, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_contact: #{e}"
@@ -13855,6 +14352,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contact_id** | [**String**](.md)| Unique identifier for a Contact | 
  **contacts** | [**Contacts**](Contacts.md)| an array of Contacts containing single Contact object with properties to update | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13872,7 +14370,7 @@ Name | Type | Description  | Notes
 
 ## update_contact_attachment_by_file_name
 
-> Attachments update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+> Attachments update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts)
 
 
 
@@ -13905,8 +14403,12 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
-  result = api_instance.update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+  result = api_instance.update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_contact_attachment_by_file_name: #{e}"
@@ -13922,6 +14424,7 @@ Name | Type | Description  | Notes
  **contact_id** | [**String**](.md)| Unique identifier for a Contact | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -13939,7 +14442,7 @@ Name | Type | Description  | Notes
 
 ## update_contact_group
 
-> ContactGroups update_contact_group(xero_tenant_id, contact_group_id, contact_groups)
+> ContactGroups update_contact_group(xero_tenant_id, contact_group_id, contact_groups, opts)
 
 Updates a specific contact group
 
@@ -13971,9 +14474,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contact_group_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Contact Group
 contact_groups = { "ContactGroups":[ { "Name":"Suppliers" } ] } # ContactGroups | an array of Contact groups with Name of specific group to update
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific contact group
-  result = api_instance.update_contact_group(xero_tenant_id, contact_group_id, contact_groups)
+  result = api_instance.update_contact_group(xero_tenant_id, contact_group_id, contact_groups, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_contact_group: #{e}"
@@ -13988,6 +14495,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contact_group_id** | [**String**](.md)| Unique identifier for a Contact Group | 
  **contact_groups** | [**ContactGroups**](ContactGroups.md)| an array of Contact groups with Name of specific group to update | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14038,7 +14546,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Credit Note
 credit_notes = { "CreditNotes": [ { "Type": "ACCPAYCREDIT", "Contact": { "ContactID": "430fa14a-f945-44d3-9f97-5df5e28441b8" }, "Date": "2019-01-05", "Status": "AUTHORISED", "Reference": "HelloWorld", "LineItems": [ { "Description": "Foobar", "Quantity": 2, "UnitAmount": 20, "AccountCode": "400" } ] } ] } # CreditNotes | an array of Credit Notes containing credit note details to update
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14059,6 +14569,7 @@ Name | Type | Description  | Notes
  **credit_note_id** | [**String**](.md)| Unique identifier for a Credit Note | 
  **credit_notes** | [**CreditNotes**](CreditNotes.md)| an array of Credit Notes containing credit note details to update | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14076,7 +14587,7 @@ Name | Type | Description  | Notes
 
 ## update_credit_note_attachment_by_file_name
 
-> Attachments update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body)
+> Attachments update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, opts)
 
 Updates attachments on a specific credit note by file name
 
@@ -14109,9 +14620,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 credit_note_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Credit Note
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates attachments on a specific credit note by file name
-  result = api_instance.update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body)
+  result = api_instance.update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_credit_note_attachment_by_file_name: #{e}"
@@ -14127,6 +14642,7 @@ Name | Type | Description  | Notes
  **credit_note_id** | [**String**](.md)| Unique identifier for a Credit Note | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14144,7 +14660,7 @@ Name | Type | Description  | Notes
 
 ## update_expense_claim
 
-> ExpenseClaims update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims)
+> ExpenseClaims update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims, opts)
 
 Updates a specific expense claims
 
@@ -14176,9 +14692,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 expense_claim_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ExpenseClaim
 expense_claims = { "ExpenseClaims": [ { "Status": "SUBMITTED", "User": { "UserID": "d1164823-0ac1-41ad-987b-b4e30fe0b273" }, "Receipts": [ { "Lineitems": [], "ReceiptID": "dc1c7f6d-0a4c-402f-acac-551d62ce5816" } ] } ] } # ExpenseClaims | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific expense claims
-  result = api_instance.update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims)
+  result = api_instance.update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_expense_claim: #{e}"
@@ -14193,6 +14713,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **expense_claim_id** | [**String**](.md)| Unique identifier for a ExpenseClaim | 
  **expense_claims** | [**ExpenseClaims**](ExpenseClaims.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14243,7 +14764,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Invoice
 invoices = { "Invoices": [{ Reference: "May the force be with you", "InvoiceID": "00000000-0000-0000-0000-000000000000", "LineItems": [], "Contact": {}, "Type": "ACCPAY" }]} # Invoices | 
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14264,6 +14787,7 @@ Name | Type | Description  | Notes
  **invoice_id** | [**String**](.md)| Unique identifier for an Invoice | 
  **invoices** | [**Invoices**](Invoices.md)|  | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14281,7 +14805,7 @@ Name | Type | Description  | Notes
 
 ## update_invoice_attachment_by_file_name
 
-> Attachments update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body)
+> Attachments update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, opts)
 
 Updates an attachment from a specific invoices or purchase bill by filename
 
@@ -14314,9 +14838,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Invoice
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates an attachment from a specific invoices or purchase bill by filename
-  result = api_instance.update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body)
+  result = api_instance.update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_invoice_attachment_by_file_name: #{e}"
@@ -14332,6 +14860,7 @@ Name | Type | Description  | Notes
  **invoice_id** | [**String**](.md)| Unique identifier for an Invoice | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14382,7 +14911,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 item_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Item
 items = { "Items": [ { "Code": "ItemCode123", "Description": "Description 123" } ] } # Items | 
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14403,6 +14934,7 @@ Name | Type | Description  | Notes
  **item_id** | [**String**](.md)| Unique identifier for an Item | 
  **items** | [**Items**](Items.md)|  | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14420,7 +14952,7 @@ Name | Type | Description  | Notes
 
 ## update_linked_transaction
 
-> LinkedTransactions update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_transactions)
+> LinkedTransactions update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_transactions, opts)
 
 Updates a specific linked transactions (billable expenses)
 
@@ -14452,9 +14984,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 linked_transaction_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a LinkedTransaction
 linked_transactions = { "LinkedTransactions": [ { "SourceTransactionID": "00000000-0000-0000-0000-000000000000", "SourceLineItemID": "00000000-0000-0000-0000-000000000000" } ] } # LinkedTransactions | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific linked transactions (billable expenses)
-  result = api_instance.update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_transactions)
+  result = api_instance.update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_transactions, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_linked_transaction: #{e}"
@@ -14469,6 +15005,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **linked_transaction_id** | [**String**](.md)| Unique identifier for a LinkedTransaction | 
  **linked_transactions** | [**LinkedTransactions**](LinkedTransactions.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14486,7 +15023,7 @@ Name | Type | Description  | Notes
 
 ## update_manual_journal
 
-> ManualJournals update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals)
+> ManualJournals update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals, opts)
 
 Updates a specific manual journal
 
@@ -14518,9 +15055,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journal_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ManualJournal
 manual_journals = { "ManualJournals": [ { "Narration": "Hello Xero", "ManualJournalID": "00000000-0000-0000-0000-000000000000", "JournalLines": [] } ] } # ManualJournals | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific manual journal
-  result = api_instance.update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals)
+  result = api_instance.update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_manual_journal: #{e}"
@@ -14535,6 +15076,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **manual_journal_id** | [**String**](.md)| Unique identifier for a ManualJournal | 
  **manual_journals** | [**ManualJournals**](ManualJournals.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14552,7 +15094,7 @@ Name | Type | Description  | Notes
 
 ## update_manual_journal_attachment_by_file_name
 
-> Attachments update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+> Attachments update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts)
 
 Updates a specific attachment from a specific manual journal by file name
 
@@ -14585,9 +15127,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journal_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a ManualJournal
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment from a specific manual journal by file name
-  result = api_instance.update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+  result = api_instance.update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_manual_journal_attachment_by_file_name: #{e}"
@@ -14603,6 +15149,7 @@ Name | Type | Description  | Notes
  **manual_journal_id** | [**String**](.md)| Unique identifier for a ManualJournal | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14654,7 +15201,9 @@ bank_transactions = { "BankTransactions": [ { "Type": "SPEND", "Contact": { "Con
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14675,6 +15224,7 @@ Name | Type | Description  | Notes
  **bank_transactions** | [**BankTransactions**](BankTransactions.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14724,7 +15274,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 contacts = { "Contacts": [ { "Name": "Bruce Banner", "EmailAddress": "hulk@avengers.com", "Phones": [ { "PhoneType": "MOBILE", "PhoneNumber": "555-1212", "PhoneAreaCode": "415" } ], "PaymentTerms": { "Bills": { "Day": 15, "Type": "OFCURRENTMONTH" }, "Sales": { "Day": 10, "Type": "DAYSAFTERBILLMONTH" } } } ] } # Contacts | 
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14744,6 +15296,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **contacts** | [**Contacts**](Contacts.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14795,7 +15348,9 @@ credit_notes = { "CreditNotes":[ { "Type":"ACCPAYCREDIT", "Contact":{ "ContactID
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14816,6 +15371,7 @@ Name | Type | Description  | Notes
  **credit_notes** | [**CreditNotes**](CreditNotes.md)| an array of Credit Notes with a single CreditNote object. | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14865,7 +15421,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 employees = { "Employees": [ { "FirstName": "Nick", "LastName": "Fury", "ExternalLink": { "Url": "http://twitter.com/#!/search/Nick+Fury" } } ] } # Employees | Employees with array of Employee object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14885,6 +15443,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employees** | [**Employees**](Employees.md)| Employees with array of Employee object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -14936,7 +15495,9 @@ invoices = { "Invoices": [ { "Type": "ACCREC", "Contact": { "ContactID": "430fa1
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -14957,6 +15518,7 @@ Name | Type | Description  | Notes
  **invoices** | [**Invoices**](Invoices.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15008,7 +15570,9 @@ items = { "Items": [ { "Code": "ItemCode123", "Name": "ItemName XYZ", "Descripti
 opts = {
   summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
 
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15029,6 +15593,7 @@ Name | Type | Description  | Notes
  **items** | [**Items**](Items.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15078,7 +15643,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 manual_journals = { "ManualJournals": [ { "Narration": "Journal Desc", "JournalLines": [ { "LineAmount": 100, "AccountCode": "400", "Description": "Money Movement" }, { "LineAmount": -100, "AccountCode": "400", "Description": "Prepayment of things", "Tracking": [ { "Name": "North", "Option": "Region" } ] } ], "Date": "2019-03-14" } ] } # ManualJournals | ManualJournals array with ManualJournal object in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15098,6 +15665,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **manual_journals** | [**ManualJournals**](ManualJournals.md)| ManualJournals array with ManualJournal object in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15147,7 +15715,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_orders = { "PurchaseOrders": [ { "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "LineItems": [ { "Description": "Foobar", "Quantity": 1, "UnitAmount": 20, "AccountCode": "710" } ], "Date": "2019-03-13" } ] } # PurchaseOrders | 
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15167,6 +15737,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **purchase_orders** | [**PurchaseOrders**](PurchaseOrders.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15216,7 +15787,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quotes = { "Quotes": [ { "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "LineItems": [ { "Description": "Foobar", "Quantity": 1, "UnitAmount": 20, "AccountCode": "12775" } ], "Date": "2020-02-01" } ] } # Quotes | 
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15236,6 +15809,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **quotes** | [**Quotes**](Quotes.md)|  | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15285,7 +15859,9 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoices = { "RepeatingInvoices": [ { "Schedule": { "Period": 1, "Unit": "MONTHLY", "DueDate": 10, "DueDateType": "OFFOLLOWINGMONTH", "StartDate": "\/Date(1555286400000+0000)\/" }, "Type": "ACCREC", "Reference": "[Week]", "ApprovedForSending": false, "SendCopy": false, "MarkAsSent": false, "IncludePDF": false, "Contact": { "ContactID": "430fa14a-f945-44d3-9f97-5df5e28441b8", "Name": "Liam Gallagher" }, "Status": "AUTHORISED", "LineAmountTypes": "Exclusive", "LineItems": [ { "Description": "Guitars Fender Strat", "UnitAmount": 5000.00, "TaxType": "OUTPUT2", "TaxAmount": 750.00, "LineAmount": 5000.00, "AccountCode": "200", "Tracking": [], "Quantity": 1.0000, "LineItemID": "13a8353c-d2af-4d5b-920c-438449f08900", "DiscountEnteredAsPercent": true } ], "CurrencyCode": "NZD" } ] } # RepeatingInvoices | RepeatingInvoices with an array of repeating invoice objects in body of request
 opts = {
-  summarize_errors: false # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+  summarize_errors: false, # Boolean | If false return 200 OK and mix of successfully created objects and any with validation errors
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15305,6 +15881,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **repeating_invoices** | [**RepeatingInvoices**](RepeatingInvoices.md)| RepeatingInvoices with an array of repeating invoice objects in body of request | 
  **summarize_errors** | **Boolean**| If false return 200 OK and mix of successfully created objects and any with validation errors | [optional] [default to false]
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15322,7 +15899,7 @@ Name | Type | Description  | Notes
 
 ## update_purchase_order
 
-> PurchaseOrders update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders)
+> PurchaseOrders update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders, opts)
 
 Updates a specific purchase order
 
@@ -15354,9 +15931,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_order_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Purchase Order
 purchase_orders = { "PurchaseOrders": [ { "AttentionTo": "Peter Parker", "LineItems": [], "Contact": {} } ] } # PurchaseOrders | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific purchase order
-  result = api_instance.update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders)
+  result = api_instance.update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_purchase_order: #{e}"
@@ -15371,6 +15952,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **purchase_order_id** | [**String**](.md)| Unique identifier for an Purchase Order | 
  **purchase_orders** | [**PurchaseOrders**](PurchaseOrders.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15388,7 +15970,7 @@ Name | Type | Description  | Notes
 
 ## update_purchase_order_attachment_by_file_name
 
-> Attachments update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+> Attachments update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts)
 
 Updates a specific attachment for a specific purchase order by filename
 
@@ -15421,9 +16003,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 purchase_order_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Purchase Order
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment for a specific purchase order by filename
-  result = api_instance.update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+  result = api_instance.update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_purchase_order_attachment_by_file_name: #{e}"
@@ -15439,6 +16025,7 @@ Name | Type | Description  | Notes
  **purchase_order_id** | [**String**](.md)| Unique identifier for an Purchase Order | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15456,7 +16043,7 @@ Name | Type | Description  | Notes
 
 ## update_quote
 
-> Quotes update_quote(xero_tenant_id, quote_id, quotes)
+> Quotes update_quote(xero_tenant_id, quote_id, quotes, opts)
 
 Updates a specific quote
 
@@ -15488,9 +16075,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quote_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Quote
 quotes = { "Quotes": [ { "Reference": "I am an update", "Contact": { "ContactID": "00000000-0000-0000-0000-000000000000" }, "Date": "2020-02-01" } ] } # Quotes | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific quote
-  result = api_instance.update_quote(xero_tenant_id, quote_id, quotes)
+  result = api_instance.update_quote(xero_tenant_id, quote_id, quotes, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_quote: #{e}"
@@ -15505,6 +16096,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **quote_id** | [**String**](.md)| Unique identifier for an Quote | 
  **quotes** | [**Quotes**](Quotes.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15522,7 +16114,7 @@ Name | Type | Description  | Notes
 
 ## update_quote_attachment_by_file_name
 
-> Attachments update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+> Attachments update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts)
 
 Updates a specific attachment from a specific quote by filename
 
@@ -15555,9 +16147,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 quote_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for an Quote
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment from a specific quote by filename
-  result = api_instance.update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+  result = api_instance.update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_quote_attachment_by_file_name: #{e}"
@@ -15573,6 +16169,7 @@ Name | Type | Description  | Notes
  **quote_id** | [**String**](.md)| Unique identifier for an Quote | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15623,7 +16220,9 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 receipt_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Receipt
 receipts = { "Receipts": [ { "Lineitems": [], "User": { "UserID": "00000000-0000-0000-0000-000000000000" }, "Reference": "Foobar" } ] } # Receipts | 
 opts = {
-  unitdp: 4 # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+  unitdp: 4, # Integer | e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
@@ -15644,6 +16243,7 @@ Name | Type | Description  | Notes
  **receipt_id** | [**String**](.md)| Unique identifier for a Receipt | 
  **receipts** | [**Receipts**](Receipts.md)|  | 
  **unitdp** | **Integer**| e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts | [optional] 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15661,7 +16261,7 @@ Name | Type | Description  | Notes
 
 ## update_receipt_attachment_by_file_name
 
-> Attachments update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
+> Attachments update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts)
 
 Updates a specific attachment on a specific expense claim receipts by file name
 
@@ -15694,9 +16294,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 receipt_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Receipt
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment on a specific expense claim receipts by file name
-  result = api_instance.update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
+  result = api_instance.update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_receipt_attachment_by_file_name: #{e}"
@@ -15712,6 +16316,7 @@ Name | Type | Description  | Notes
  **receipt_id** | [**String**](.md)| Unique identifier for a Receipt | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15729,7 +16334,7 @@ Name | Type | Description  | Notes
 
 ## update_repeating_invoice
 
-> RepeatingInvoices update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_invoices)
+> RepeatingInvoices update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_invoices, opts)
 
 Deletes a specific repeating invoice template
 
@@ -15761,9 +16366,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Repeating Invoice
 repeating_invoices = { "Schedule": { "Period": 1, "Unit": "MONTHLY", "DueDate": 10, "DueDateType": "OFFOLLOWINGMONTH", "StartDate": "\/Date(1555286400000+0000)\/", "EndDate": "\/Date(1569801600000+0000)\/", "NextScheduledDate": "\/Date(1555286400000+0000)\/" }, "RepeatingInvoiceID": "428c0d75-909f-4b04-8403-a48dc27283b0", "Type": "ACCREC", "Reference": "[Week]", "HasAttachments": true, "ApprovedForSending": false, "SendCopy": false, "MarkAsSent": false, "IncludePDF": false, "ID": "428c0d75-909f-4b04-8403-a48dc27283b0", "Contact": { "ContactID": "430fa14a-f945-44d3-9f97-5df5e28441b8", "Name": "Liam Gallagher", "Addresses": [], "Phones": [], "ContactGroups": [], "ContactPersons": [], "HasValidationErrors": false }, "Status": "DELETED", "LineAmountTypes": "Exclusive", "LineItems": [ { "Description": "Guitars Fender Strat", "UnitAmount": 5000.00, "TaxType": "OUTPUT2", "TaxAmount": 750.00, "LineAmount": 5000.00, "AccountCode": "200", "Tracking": [], "Quantity": 1.0000, "LineItemID": "13a8353c-d2af-4d5b-920c-438449f08900", "DiscountEnteredAsPercent": true } ], "SubTotal": 5000.00, "TotalTax": 750.00, "Total": 5750.00, "CurrencyCode": "NZD" } # RepeatingInvoices | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Deletes a specific repeating invoice template
-  result = api_instance.update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_invoices)
+  result = api_instance.update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_invoices, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_repeating_invoice: #{e}"
@@ -15778,6 +16387,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **repeating_invoice_id** | [**String**](.md)| Unique identifier for a Repeating Invoice | 
  **repeating_invoices** | [**RepeatingInvoices**](RepeatingInvoices.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15795,7 +16405,7 @@ Name | Type | Description  | Notes
 
 ## update_repeating_invoice_attachment_by_file_name
 
-> Attachments update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+> Attachments update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
 
 Updates a specific attachment from a specific repeating invoices by file name
 
@@ -15828,9 +16438,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Repeating Invoice
 file_name = 'xero-dev.jpg' # String | Name of the attachment
 body = 'body_example' # String | Byte array of file in body of request
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific attachment from a specific repeating invoices by file name
-  result = api_instance.update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+  result = api_instance.update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_repeating_invoice_attachment_by_file_name: #{e}"
@@ -15846,6 +16460,7 @@ Name | Type | Description  | Notes
  **repeating_invoice_id** | [**String**](.md)| Unique identifier for a Repeating Invoice | 
  **file_name** | **String**| Name of the attachment | 
  **body** | **String**| Byte array of file in body of request | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15863,7 +16478,7 @@ Name | Type | Description  | Notes
 
 ## update_tax_rate
 
-> TaxRates update_tax_rate(xero_tenant_id, tax_rates)
+> TaxRates update_tax_rate(xero_tenant_id, tax_rates, opts)
 
 Updates tax rates
 
@@ -15894,9 +16509,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tax_rates = { "TaxRates": [ { "Name": "State Tax NY", "TaxComponents": [ { "Name": "State Tax", "Rate": 2.25 } ], "Status": "DELETED", "ReportTaxType": "INPUT" } ] } # TaxRates | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates tax rates
-  result = api_instance.update_tax_rate(xero_tenant_id, tax_rates)
+  result = api_instance.update_tax_rate(xero_tenant_id, tax_rates, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_tax_rate: #{e}"
@@ -15910,6 +16529,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **tax_rates** | [**TaxRates**](TaxRates.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15927,7 +16547,7 @@ Name | Type | Description  | Notes
 
 ## update_tracking_category
 
-> TrackingCategories update_tracking_category(xero_tenant_id, tracking_category_id, tracking_category)
+> TrackingCategories update_tracking_category(xero_tenant_id, tracking_category_id, tracking_category, opts)
 
 Updates a specific tracking category
 
@@ -15959,9 +16579,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tracking_category_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a TrackingCategory
 tracking_category = { "Name": "Avengers" } # TrackingCategory | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific tracking category
-  result = api_instance.update_tracking_category(xero_tenant_id, tracking_category_id, tracking_category)
+  result = api_instance.update_tracking_category(xero_tenant_id, tracking_category_id, tracking_category, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_tracking_category: #{e}"
@@ -15976,6 +16600,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **tracking_category_id** | [**String**](.md)| Unique identifier for a TrackingCategory | 
  **tracking_category** | [**TrackingCategory**](TrackingCategory.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -15993,7 +16618,7 @@ Name | Type | Description  | Notes
 
 ## update_tracking_options
 
-> TrackingOptions update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option)
+> TrackingOptions update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option, opts)
 
 Updates a specific option for a specific tracking category
 
@@ -16026,9 +16651,13 @@ xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 tracking_category_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a TrackingCategory
 tracking_option_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for a Tracking Option
 tracking_option = { name: "Vision" } # TrackingOption | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific option for a specific tracking category
-  result = api_instance.update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option)
+  result = api_instance.update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option, opts)
   p result
 rescue XeroRuby::Accounting::ApiError => e
   puts "Exception when calling AccountingApi->update_tracking_options: #{e}"
@@ -16044,6 +16673,7 @@ Name | Type | Description  | Notes
  **tracking_category_id** | [**String**](.md)| Unique identifier for a TrackingCategory | 
  **tracking_option_id** | [**String**](.md)| Unique identifier for a Tracking Option | 
  **tracking_option** | [**TrackingOption**](TrackingOption.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/accounting/Allocation.md b/docs/accounting/Allocation.md
index 19584807..fc0471cd 100644
--- a/docs/accounting/Allocation.md
+++ b/docs/accounting/Allocation.md
@@ -4,12 +4,14 @@
 
 Name | Type | Description | Notes
 ------------ | ------------- | ------------- | -------------
+**allocation_id** | **String** | Xero generated unique identifier | [optional] 
 **invoice** | [**Invoice**](Invoice.md) |  | 
 **overpayment** | [**Overpayment**](Overpayment.md) |  | [optional] 
 **prepayment** | [**Prepayment**](Prepayment.md) |  | [optional] 
 **credit_note** | [**CreditNote**](CreditNote.md) |  | [optional] 
 **amount** | **BigDecimal** | the amount being applied to the invoice | 
 **date** | **Date** | the date the allocation is applied YYYY-MM-DD. | 
+**is_deleted** | **Boolean** | A flag that returns true when the allocation is succesfully deleted | [optional] 
 **status_attribute_string** | **String** | A string to indicate if a invoice status | [optional] 
 **validation_errors** | [**Array&lt;ValidationError&gt;**](ValidationError.md) | Displays array of validation error messages from the API | [optional] 
 
@@ -18,12 +20,14 @@ Name | Type | Description | Notes
 ```ruby
 require 'XeroRuby::Accounting'
 
-instance = XeroRuby::Accounting::Allocation.new(invoice: null,
+instance = XeroRuby::Accounting::Allocation.new(allocation_id: null,
+                                 invoice: null,
                                  overpayment: null,
                                  prepayment: null,
                                  credit_note: null,
                                  amount: null,
                                  date: null,
+                                 is_deleted: null,
                                  status_attribute_string: null,
                                  validation_errors: null)
 ```
diff --git a/docs/accounting/Contact.md b/docs/accounting/Contact.md
index 189b6e4d..40a79147 100644
--- a/docs/accounting/Contact.md
+++ b/docs/accounting/Contact.md
@@ -14,7 +14,6 @@ Name | Type | Description | Notes
 **last_name** | **String** | Last name of contact person (max length &#x3D; 255) | [optional] 
 **company_number** | **String** | Company registration number (max length &#x3D; 50) | [optional] 
 **email_address** | **String** | Email address of contact person (umlauts not supported) (max length  &#x3D; 255) | [optional] 
-**skype_user_name** | **String** | Skype user name of contact | [optional] 
 **contact_persons** | [**Array&lt;ContactPerson&gt;**](ContactPerson.md) | See contact persons | [optional] 
 **bank_account_details** | **String** | Bank account number of contact | [optional] 
 **tax_number** | **String** | Tax number of contact – this is also known as the ABN (Australia), GST Number (New Zealand), VAT Number (UK) or Tax ID Number (US and global) in the Xero UI depending on which regionalized version of Xero you are using (max length &#x3D; 50) | [optional] 
@@ -63,7 +62,6 @@ instance = XeroRuby::Accounting::Contact.new(contact_id: null,
                                  last_name: null,
                                  company_number: null,
                                  email_address: null,
-                                 skype_user_name: null,
                                  contact_persons: null,
                                  bank_account_details: null,
                                  tax_number: null,
diff --git a/docs/accounting/TenNinetyNineContact.md b/docs/accounting/TenNinetyNineContact.md
index 69bc3ce8..95cfa1a2 100644
--- a/docs/accounting/TenNinetyNineContact.md
+++ b/docs/accounting/TenNinetyNineContact.md
@@ -26,6 +26,9 @@ Name | Type | Description | Notes
 **street_address** | **String** | Contact address on 1099 Form | [optional] 
 **tax_id** | **String** | Contact tax id on 1099 Form | [optional] 
 **contact_id** | **String** | Contact contact id | [optional] 
+**legal_name** | **String** | Contact legal name | [optional] 
+**business_name** | **String** | Contact business name | [optional] 
+**federal_tax_classification** | **String** | Contact federal tax classification | [optional] 
 
 ## Code Sample
 
@@ -53,7 +56,10 @@ instance = XeroRuby::Accounting::TenNinetyNineContact.new(box1: null,
                                  email: null,
                                  street_address: null,
                                  tax_id: null,
-                                 contact_id: null)
+                                 contact_id: null,
+                                 legal_name: null,
+                                 business_name: null,
+                                 federal_tax_classification: null)
 ```
 
 
diff --git a/docs/accounting/index.html b/docs/accounting/index.html
index 229941cd..360f8268 100644
--- a/docs/accounting/index.html
+++ b/docs/accounting/index.html
@@ -975,7 +975,7 @@
   "title" : "",
   "type" : "string",
   "description" : "See Account Types",
-  "enum" : [ "BANK", "CURRENT", "CURRLIAB", "DEPRECIATN", "DIRECTCOSTS", "EQUITY", "EXPENSE", "FIXED", "INVENTORY", "LIABILITY", "NONCURRENT", "OTHERINCOME", "OVERHEADS", "PREPAYMENT", "REVENUE", "SALES", "TERMLIAB", "PAYGLIABILITY", "PAYG", "SUPERANNUATIONEXPENSE", "SUPERANNUATIONLIABILITY", "WAGESEXPENSE" ]
+  "enum" : [ "BANK", "CURRENT", "CURRLIAB", "DEPRECIATN", "DIRECTCOSTS", "EQUITY", "EXPENSE", "FIXED", "INVENTORY", "LIABILITY", "NONCURRENT", "OTHERINCOME", "OVERHEADS", "PREPAYMENT", "REVENUE", "SALES", "TERMLIAB", "PAYG" ]
 };
       defs["Accounts"] = {
   "title" : "",
@@ -1183,6 +1183,11 @@
   "required" : [ "Amount", "Date", "Invoice" ],
   "type" : "object",
   "properties" : {
+    "AllocationID" : {
+      "type" : "string",
+      "description" : "Xero generated unique identifier",
+      "format" : "uuid"
+    },
     "Invoice" : {
       "$ref" : "#/components/schemas/Invoice"
     },
@@ -1206,6 +1211,11 @@
       "description" : "the date the allocation is applied YYYY-MM-DD.",
       "x-is-msdate" : true
     },
+    "IsDeleted" : {
+      "type" : "boolean",
+      "description" : "A flag that returns true when the allocation is succesfully deleted",
+      "readOnly" : true
+    },
     "StatusAttributeString" : {
       "type" : "string",
       "description" : "A string to indicate if a invoice status"
@@ -2068,10 +2078,6 @@
       "type" : "string",
       "description" : "Email address of contact person (umlauts not supported) (max length  = 255)"
     },
-    "SkypeUserName" : {
-      "type" : "string",
-      "description" : "Skype user name of contact"
-    },
     "ContactPersons" : {
       "type" : "array",
       "description" : "See contact persons",
@@ -2594,7 +2600,7 @@
   "title" : "",
   "type" : "string",
   "description" : "3 letter alpha code for the currency – see list of currency codes",
-  "enum" : [ "AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTN", "BWP", "BYN", "BYR", "BZD", "CAD", "CDF", "CHF", "CLF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EEK", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "INR", "IQD", "IRR", "ISK", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LTL", "LVL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRO", "MRU", "MUR", "MVR", "MWK", "MXN", "MXV", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SKK", "SLE", "SLL", "SOS", "SRD", "STD", "STN", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TWD", "TZS", "UAH", "UGX", "USD", "UYU", "UZS", "VEF", "VES", "VND", "VUV", "WST", "XAF", "XCD", "XOF", "XPF", "YER", "ZAR", "ZMW", "ZMK", "ZWD", "" ],
+  "enum" : [ "AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTN", "BWP", "BYN", "BYR", "BZD", "CAD", "CDF", "CHF", "CLF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EEK", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "INR", "IQD", "IRR", "ISK", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LTL", "LVL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRO", "MRU", "MUR", "MVR", "MWK", "MXN", "MXV", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SKK", "SLE", "SLL", "SOS", "SRD", "STD", "STN", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TWD", "TZS", "UAH", "UGX", "USD", "UYU", "UZS", "VEF", "VES", "VND", "VUV", "WST", "XAF", "XCD", "XOF", "XPF", "YER", "ZAR", "ZMW", "ZMK", "ZWD" ],
   "x-enum-varnames" : [ "AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTN", "BWP", "BYN", "BYR", "BZD", "CAD", "CDF", "CHF", "CLF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EEK", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "INR", "IQD", "IRR", "ISK", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LTL", "LVL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRO", "MRU", "MUR", "MVR", "MWK", "MXN", "MXV", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SKK", "SLE", "SLL", "SOS", "SRD", "STN", "STD", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY_LIRA", "TTD", "TWD", "TZS", "UAH", "UGX", "USD", "UYU", "UZS", "VEF", "VES", "VND", "VUV", "WST", "XAF", "XCD", "XOF", "XPF", "YER", "ZAR", "ZMW", "ZMK", "ZWD", "EMPTY_CURRENCY" ]
 };
       defs["Element"] = {
@@ -5626,7 +5632,7 @@
     "ReportTaxType" : {
       "type" : "string",
       "description" : "See ReportTaxTypes",
-      "enum" : [ "AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY" ]
+      "enum" : [ "AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY", "USSALESTAX" ]
     },
     "CanApplyToAssets" : {
       "type" : "boolean",
@@ -5691,7 +5697,7 @@
   "title" : "",
   "type" : "string",
   "description" : "See Tax Types – can only be used on update calls",
-  "enum" : [ "OUTPUT", "INPUT", "CAPEXINPUT", "EXEMPTEXPORT", "EXEMPTEXPENSES", "EXEMPTCAPITAL", "EXEMPTOUTPUT", "INPUTTAXED", "BASEXCLUDED", "GSTONCAPIMPORTS", "GSTONIMPORTS", "NONE", "INPUT2", "ZERORATED", "OUTPUT2", "CAPEXINPUT2", "CAPEXOUTPUT", "CAPEXOUTPUT2", "CAPEXSRINPUT", "CAPEXSROUTPUT", "ECACQUISITIONS", "ECZRINPUT", "ECZROUTPUT", "ECZROUTPUTSERVICES", "EXEMPTINPUT", "REVERSECHARGES", "RRINPUT", "RROUTPUT", "SRINPUT", "SROUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "BLINPUT", "DSOUTPUT", "EPINPUT", "ES33OUTPUT", "ESN33OUTPUT", "IGDSINPUT2", "IMINPUT2", "MEINPUT", "NRINPUT", "OPINPUT", "OSOUTPUT", "TXESSINPUT", "TXN33INPUT", "TXPETINPUT", "TXREINPUT", "INPUT3", "INPUT4", "OUTPUT3", "OUTPUT4", "SROUTPUT2", "TXCA", "SRCAS", "BLINPUT2", "DRCHARGESUPPLY20", "DRCHARGE20", "DRCHARGESUPPLY5", "DRCHARGE5", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "OUTPUTY23", "DSOUTPUTY23", "INPUTY23", "IMINPUT2Y23", "IGDSINPUT2Y23", "TXPETINPUTY23", "TXESSINPUTY23", "TXN33INPUTY23", "TXREINPUTY23", "TXCAY23", "BADDEBTRELIEFY23", "IGDSINPUT3Y23", "SROVRRSY23", "SROVRLVGY23", "SRLVGY23", "TXRCN33Y23", "TXRCREY23", "TXRCESSY23", "TXRCTSY23", "IM", "IMY23", "IMESS", "IMESSY23", "IMN33", "IMN33Y23", "IMRE", "IMREY23", "BADDEBTRECOVERY", "BADDEBTRECOVERYY23" ]
+  "enum" : [ "OUTPUT", "INPUT", "CAPEXINPUT", "EXEMPTEXPORT", "EXEMPTEXPENSES", "EXEMPTCAPITAL", "EXEMPTOUTPUT", "INPUTTAXED", "BASEXCLUDED", "GSTONCAPIMPORTS", "GSTONIMPORTS", "NONE", "INPUT2", "ZERORATED", "OUTPUT2", "CAPEXINPUT2", "CAPEXOUTPUT", "CAPEXOUTPUT2", "CAPEXSRINPUT", "CAPEXSROUTPUT", "ECACQUISITIONS", "ECZRINPUT", "ECZROUTPUT", "ECZROUTPUTSERVICES", "EXEMPTINPUT", "REVERSECHARGES", "RRINPUT", "RROUTPUT", "SRINPUT", "SROUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "BLINPUT", "DSOUTPUT", "EPINPUT", "ES33OUTPUT", "ESN33OUTPUT", "IGDSINPUT2", "IMINPUT2", "MEINPUT", "NRINPUT", "OPINPUT", "OSOUTPUT", "TXESSINPUT", "TXN33INPUT", "TXPETINPUT", "TXREINPUT", "INPUT3", "INPUT4", "OUTPUT3", "OUTPUT4", "SROUTPUT2", "TXCA", "SRCAS", "BLINPUT2", "DRCHARGESUPPLY20", "DRCHARGE20", "DRCHARGESUPPLY5", "DRCHARGE5", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "OUTPUTY23", "DSOUTPUTY23", "INPUTY23", "IMINPUT2Y23", "IGDSINPUT2Y23", "TXPETINPUTY23", "TXESSINPUTY23", "TXN33INPUTY23", "TXREINPUTY23", "TXCAY23", "BADDEBTRELIEFY23", "IGDSINPUT3Y23", "SROVRRSY23", "SROVRLVGY23", "SRLVGY23", "TXRCN33Y23", "TXRCREY23", "TXRCESSY23", "TXRCTSY23", "IM", "IMY23", "IMESS", "IMESSY23", "IMN33", "IMN33Y23", "IMRE", "IMREY23", "BADDEBTRECOVERY", "BADDEBTRECOVERYY23", "OUTPUTY24", "DSOUTPUTY24", "INPUTY24", "IGDSINPUT2Y24", "TXPETINPUTY24", "TXESSINPUTY24", "TXN33INPUTY24", "TXREINPUTY24", "TXCAY24", "BADDEBTRELIEFY24", "IGDSINPUT3Y24", "SROVRRSY24", "SROVRLVGY24", "SRLVGY24", "TXRCTSY24", "TXRCESSY24", "TXRCN33Y24", "TXRCREY24", "IMY24", "IMESSY24", "IMN33Y24", "IMREY24", "BADDEBTRECOVERYY24", "OSOUTPUT2" ]
 };
       defs["TenNinetyNineContact"] = {
   "title" : "",
@@ -5810,6 +5816,19 @@
       "type" : "string",
       "description" : "Contact contact id",
       "format" : "uuid"
+    },
+    "LegalName" : {
+      "type" : "string",
+      "description" : "Contact legal name"
+    },
+    "BusinessName" : {
+      "type" : "string",
+      "description" : "Contact business name"
+    },
+    "FederalTaxClassification" : {
+      "type" : "string",
+      "description" : "Contact federal tax classification",
+      "enum" : [ "SOLE_PROPRIETOR", "PARTNERSHIP", "TRUST_OR_ESTATE", "NONPROFIT", "C_CORP", "S_CORP", "OTHER" ]
     }
   },
   "description" : ""
@@ -6074,7 +6093,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="Accounting"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="Accounting"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="Accounting"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="Accounting"><a href="#api-Accounting">Methods</a></li>
               <li data-group="Accounting" data-name="createAccount" class="">
                 <a href="#api-Accounting-createAccount">createAccount</a>
@@ -6259,15 +6278,24 @@
               <li data-group="Accounting" data-name="deleteContactGroupContacts" class="">
                 <a href="#api-Accounting-deleteContactGroupContacts">deleteContactGroupContacts</a>
               </li>
+              <li data-group="Accounting" data-name="deleteCreditNoteAllocations" class="">
+                <a href="#api-Accounting-deleteCreditNoteAllocations">deleteCreditNoteAllocations</a>
+              </li>
               <li data-group="Accounting" data-name="deleteItem" class="">
                 <a href="#api-Accounting-deleteItem">deleteItem</a>
               </li>
               <li data-group="Accounting" data-name="deleteLinkedTransaction" class="">
                 <a href="#api-Accounting-deleteLinkedTransaction">deleteLinkedTransaction</a>
               </li>
+              <li data-group="Accounting" data-name="deleteOverpaymentAllocations" class="">
+                <a href="#api-Accounting-deleteOverpaymentAllocations">deleteOverpaymentAllocations</a>
+              </li>
               <li data-group="Accounting" data-name="deletePayment" class="">
                 <a href="#api-Accounting-deletePayment">deletePayment</a>
               </li>
+              <li data-group="Accounting" data-name="deletePrepaymentAllocations" class="">
+                <a href="#api-Accounting-deletePrepaymentAllocations">deletePrepaymentAllocations</a>
+              </li>
               <li data-group="Accounting" data-name="deleteTrackingCategory" class="">
                 <a href="#api-Accounting-deleteTrackingCategory">deleteTrackingCategory</a>
               </li>
@@ -6535,6 +6563,9 @@
               <li data-group="Accounting" data-name="getPurchaseOrderAsPdf" class="">
                 <a href="#api-Accounting-getPurchaseOrderAsPdf">getPurchaseOrderAsPdf</a>
               </li>
+              <li data-group="Accounting" data-name="getPurchaseOrderAttachmentByFileName" class="">
+                <a href="#api-Accounting-getPurchaseOrderAttachmentByFileName">getPurchaseOrderAttachmentByFileName</a>
+              </li>
               <li data-group="Accounting" data-name="getPurchaseOrderAttachmentById" class="">
                 <a href="#api-Accounting-getPurchaseOrderAttachmentById">getPurchaseOrderAttachmentById</a>
               </li>
@@ -6550,9 +6581,6 @@
               <li data-group="Accounting" data-name="getPurchaseOrders" class="">
                 <a href="#api-Accounting-getPurchaseOrders">getPurchaseOrders</a>
               </li>
-              <li data-group="Accounting" data-name="getPurchaseOrder≠AttachmentByFileName" class="">
-                <a href="#api-Accounting-getPurchaseOrder≠AttachmentByFileName">getPurchaseOrder≠AttachmentByFileName</a>
-              </li>
               <li data-group="Accounting" data-name="getQuote" class="">
                 <a href="#api-Accounting-getQuote">getQuote</a>
               </li>
@@ -6819,6 +6847,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 account = { 
   code: "123456",
@@ -6828,7 +6857,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_account(xero_tenant_id, account)
+  response = xero_client.accounting_api.create_account(xero_tenant_id, account, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_account: #{e}"
@@ -6873,6 +6902,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createAccount_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6944,9 +6993,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 account_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+  response = xero_client.accounting_api.create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_account_attachment_by_file_name: #{e}"
@@ -7047,6 +7097,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createAccountAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7118,9 +7188,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transaction_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+  response = xero_client.accounting_api.create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transaction_attachment_by_file_name: #{e}"
@@ -7221,6 +7292,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransactionAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7291,6 +7382,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transaction_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -7301,7 +7393,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, historyRecords)
+  response = xero_client.accounting_api.create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transaction_history_record: #{e}"
@@ -7379,6 +7471,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransactionHistoryRecord_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7450,6 +7562,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   contact_id: "00000000-0000-0000-0000-000000000000"
@@ -7480,7 +7593,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_bank_transactions(xero_tenant_id, bankTransactions, summarize_errors, unitdp)
+  response = xero_client.accounting_api.create_bank_transactions(xero_tenant_id, bankTransactions, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transactions: #{e}"
@@ -7525,6 +7638,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransactions_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7641,6 +7774,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 fromBankAccount = { 
   account_id: "00000000-0000-0000-0000-000000000000"
@@ -7661,7 +7795,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_bank_transfer(xero_tenant_id, bankTransfers)
+  response = xero_client.accounting_api.create_bank_transfer(xero_tenant_id, bankTransfers, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transfer: #{e}"
@@ -7706,6 +7840,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransfer_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7777,9 +7931,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transfer_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
+  response = xero_client.accounting_api.create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transfer_attachment_by_file_name: #{e}"
@@ -7880,6 +8035,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransferAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7950,6 +8125,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transfer_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -7960,7 +8136,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, historyRecords)
+  response = xero_client.accounting_api.create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_bank_transfer_history_record: #{e}"
@@ -8038,6 +8214,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBankTransferHistoryRecord_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8108,6 +8304,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 payment_account = { 
@@ -8143,7 +8340,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_batch_payment(xero_tenant_id, batchPayments, summarize_errors)
+  response = xero_client.accounting_api.create_batch_payment(xero_tenant_id, batchPayments, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_batch_payment: #{e}"
@@ -8188,6 +8385,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBatchPayment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8285,6 +8502,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 batch_payment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -8295,7 +8513,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_batch_payment_history_record(xero_tenant_id, batch_payment_id, historyRecords)
+  response = xero_client.accounting_api.create_batch_payment_history_record(xero_tenant_id, batch_payment_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_batch_payment_history_record: #{e}"
@@ -8373,6 +8591,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBatchPaymentHistoryRecord_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8443,6 +8681,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 branding_theme_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 payment_service = { 
   payment_service_id: "00000000-0000-0000-0000-000000000000",
@@ -8456,7 +8695,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, paymentServices)
+  response = xero_client.accounting_api.create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, paymentServices, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_branding_theme_payment_services: #{e}"
@@ -8534,6 +8773,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBrandingThemePaymentServices_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8605,9 +8864,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+  response = xero_client.accounting_api.create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_contact_attachment_by_file_name: #{e}"
@@ -8708,6 +8968,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createContactAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8777,6 +9057,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 contact_group = { 
   name: "VIPs"
@@ -8787,7 +9068,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_contact_group(xero_tenant_id, contactGroups)
+  response = xero_client.accounting_api.create_contact_group(xero_tenant_id, contactGroups, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_contact_group: #{e}"
@@ -8832,6 +9113,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createContactGroup_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8902,6 +9203,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_group_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   contact_id: "00000000-0000-0000-0000-000000000000"
@@ -8912,7 +9214,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts)
+  response = xero_client.accounting_api.create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_contact_group_contacts: #{e}"
@@ -8990,6 +9292,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createContactGroupContacts_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9060,6 +9382,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -9070,7 +9393,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_contact_history(xero_tenant_id, contact_id, historyRecords)
+  response = xero_client.accounting_api.create_contact_history(xero_tenant_id, contact_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_contact_history: #{e}"
@@ -9148,6 +9471,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createContactHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9218,6 +9561,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 phone = { 
   phone_number: "555-1212",
@@ -9237,7 +9581,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_contacts(xero_tenant_id, contacts, summarize_errors)
+  response = xero_client.accounting_api.create_contacts(xero_tenant_id, contacts, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_contacts: #{e}"
@@ -9282,6 +9626,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createContacts_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9380,6 +9744,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 credit_note_id = '00000000-0000-0000-0000-000000000000'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 invoice = { 
@@ -9397,7 +9762,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_credit_note_allocation(xero_tenant_id, credit_note_id, allocations, summarize_errors)
+  response = xero_client.accounting_api.create_credit_note_allocation(xero_tenant_id, credit_note_id, allocations, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_credit_note_allocation: #{e}"
@@ -9475,6 +9840,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createCreditNoteAllocation_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9574,9 +9959,10 @@ <h3>Usage and SDK Samples</h3>
 credit_note_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
 include_online = true
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, include_online)
+  response = xero_client.accounting_api.create_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, include_online, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_credit_note_attachment_by_file_name: #{e}"
@@ -9677,6 +10063,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createCreditNoteAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9774,6 +10180,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 credit_note_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -9784,7 +10191,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_credit_note_history(xero_tenant_id, credit_note_id, historyRecords)
+  response = xero_client.accounting_api.create_credit_note_history(xero_tenant_id, credit_note_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_credit_note_history: #{e}"
@@ -9862,6 +10269,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createCreditNoteHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -9933,6 +10360,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 contact = { 
@@ -9960,7 +10388,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_credit_notes(xero_tenant_id, creditNotes, summarize_errors, unitdp)
+  response = xero_client.accounting_api.create_credit_notes(xero_tenant_id, creditNotes, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_credit_notes: #{e}"
@@ -10005,6 +10433,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createCreditNotes_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10121,6 +10569,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 currency = { 
   code:  XeroRuby::Accounting::CurrencyCode::USD,
@@ -10128,7 +10577,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_currency(xero_tenant_id, currency)
+  response = xero_client.accounting_api.create_currency(xero_tenant_id, currency, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_currency: #{e}"
@@ -10173,6 +10622,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createCurrency_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10243,6 +10712,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 employee = { 
   first_name: "Nick",
@@ -10254,7 +10724,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_employees(xero_tenant_id, employees, summarize_errors)
+  response = xero_client.accounting_api.create_employees(xero_tenant_id, employees, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employees: #{e}"
@@ -10299,6 +10769,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployees_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10396,6 +10886,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 expense_claim_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -10406,7 +10897,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_expense_claim_history(xero_tenant_id, expense_claim_id, historyRecords)
+  response = xero_client.accounting_api.create_expense_claim_history(xero_tenant_id, expense_claim_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_expense_claim_history: #{e}"
@@ -10484,6 +10975,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createExpenseClaimHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10553,6 +11064,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 user = { 
@@ -10577,7 +11089,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_expense_claims(xero_tenant_id, expenseClaims)
+  response = xero_client.accounting_api.create_expense_claims(xero_tenant_id, expenseClaims, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_expense_claims: #{e}"
@@ -10622,6 +11134,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createExpenseClaims_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10694,9 +11226,10 @@ <h3>Usage and SDK Samples</h3>
 invoice_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
 include_online = true
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, include_online)
+  response = xero_client.accounting_api.create_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, include_online, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_invoice_attachment_by_file_name: #{e}"
@@ -10797,6 +11330,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createInvoiceAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -10894,6 +11447,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 invoice_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -10904,7 +11458,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_invoice_history(xero_tenant_id, invoice_id, historyRecords)
+  response = xero_client.accounting_api.create_invoice_history(xero_tenant_id, invoice_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_invoice_history: #{e}"
@@ -10982,6 +11536,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createInvoiceHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11053,6 +11627,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 due_date_value = 'YYYY-MM-DD'
 
@@ -11092,7 +11667,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_invoices(xero_tenant_id, invoices, summarize_errors, unitdp)
+  response = xero_client.accounting_api.create_invoices(xero_tenant_id, invoices, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_invoices: #{e}"
@@ -11137,6 +11712,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createInvoices_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11254,6 +11849,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 item_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -11264,7 +11860,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_item_history(xero_tenant_id, item_id, historyRecords)
+  response = xero_client.accounting_api.create_item_history(xero_tenant_id, item_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_item_history: #{e}"
@@ -11342,6 +11938,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createItemHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11413,6 +12029,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 purchase_details = { 
   cogs_account_code: "500"
@@ -11431,7 +12048,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_items(xero_tenant_id, items, summarize_errors, unitdp)
+  response = xero_client.accounting_api.create_items(xero_tenant_id, items, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_items: #{e}"
@@ -11476,6 +12093,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createItems_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11592,6 +12229,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 linked_transaction = { 
   source_transaction_id: "00000000-0000-0000-0000-000000000000",
@@ -11599,7 +12237,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_linked_transaction(xero_tenant_id, linkedTransaction)
+  response = xero_client.accounting_api.create_linked_transaction(xero_tenant_id, linkedTransaction, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_linked_transaction: #{e}"
@@ -11644,6 +12282,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createLinkedTransaction_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11715,9 +12373,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 manual_journal_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+  response = xero_client.accounting_api.create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_manual_journal_attachment_by_file_name: #{e}"
@@ -11818,6 +12477,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createManualJournalAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11888,6 +12567,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 manual_journal_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -11898,7 +12578,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_manual_journal_history_record(xero_tenant_id, manual_journal_id, historyRecords)
+  response = xero_client.accounting_api.create_manual_journal_history_record(xero_tenant_id, manual_journal_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_manual_journal_history_record: #{e}"
@@ -11976,6 +12656,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createManualJournalHistoryRecord_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12046,6 +12746,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'  
 manual_journal_lines = []
 
@@ -12074,7 +12775,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_manual_journals(xero_tenant_id, manualJournals, summarize_errors)
+  response = xero_client.accounting_api.create_manual_journals(xero_tenant_id, manualJournals, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_manual_journals: #{e}"
@@ -12119,6 +12820,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createManualJournals_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12217,6 +12938,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 overpayment_id = '00000000-0000-0000-0000-000000000000'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 invoice = { 
@@ -12234,7 +12956,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_overpayment_allocations(xero_tenant_id, overpayment_id, allocations, summarize_errors)
+  response = xero_client.accounting_api.create_overpayment_allocations(xero_tenant_id, overpayment_id, allocations, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_overpayment_allocations: #{e}"
@@ -12312,6 +13034,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createOverpaymentAllocations_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12409,6 +13151,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 overpayment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -12419,7 +13162,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_overpayment_history(xero_tenant_id, overpayment_id, historyRecords)
+  response = xero_client.accounting_api.create_overpayment_history(xero_tenant_id, overpayment_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_overpayment_history: #{e}"
@@ -12497,6 +13240,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createOverpaymentHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12566,6 +13329,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 invoice = { 
@@ -12588,7 +13352,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_payment(xero_tenant_id, payment)
+  response = xero_client.accounting_api.create_payment(xero_tenant_id, payment, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_payment: #{e}"
@@ -12633,6 +13397,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12703,6 +13487,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 payment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -12713,7 +13498,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_payment_history(xero_tenant_id, payment_id, historyRecords)
+  response = xero_client.accounting_api.create_payment_history(xero_tenant_id, payment_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_payment_history: #{e}"
@@ -12791,6 +13576,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPaymentHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12860,6 +13665,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 payment_service = { 
   payment_service_name: "ACME Payments",
@@ -12872,7 +13678,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_payment_service(xero_tenant_id, paymentServices)
+  response = xero_client.accounting_api.create_payment_service(xero_tenant_id, paymentServices, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_payment_service: #{e}"
@@ -12917,6 +13723,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPaymentService_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12987,6 +13813,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 invoice = { 
@@ -13009,7 +13836,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_payments(xero_tenant_id, payments, summarize_errors)
+  response = xero_client.accounting_api.create_payments(xero_tenant_id, payments, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_payments: #{e}"
@@ -13054,6 +13881,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayments_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13152,6 +13999,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 prepayment_id = '00000000-0000-0000-0000-000000000000'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 invoice = { 
@@ -13169,7 +14017,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_prepayment_allocations(xero_tenant_id, prepayment_id, allocations, summarize_errors)
+  response = xero_client.accounting_api.create_prepayment_allocations(xero_tenant_id, prepayment_id, allocations, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_prepayment_allocations: #{e}"
@@ -13247,6 +14095,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPrepaymentAllocations_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13344,6 +14212,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 prepayment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -13354,7 +14223,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_prepayment_history(xero_tenant_id, prepayment_id, historyRecords)
+  response = xero_client.accounting_api.create_prepayment_history(xero_tenant_id, prepayment_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_prepayment_history: #{e}"
@@ -13432,6 +14301,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPrepaymentHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13503,9 +14392,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 purchase_order_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+  response = xero_client.accounting_api.create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_purchase_order_attachment_by_file_name: #{e}"
@@ -13606,6 +14496,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPurchaseOrderAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13676,6 +14586,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 purchase_order_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -13686,7 +14597,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_purchase_order_history(xero_tenant_id, purchase_order_id, historyRecords)
+  response = xero_client.accounting_api.create_purchase_order_history(xero_tenant_id, purchase_order_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_purchase_order_history: #{e}"
@@ -13764,6 +14675,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPurchaseOrderHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13834,6 +14765,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 contact = { 
@@ -13860,7 +14792,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_purchase_orders(xero_tenant_id, purchaseOrders, summarize_errors)
+  response = xero_client.accounting_api.create_purchase_orders(xero_tenant_id, purchaseOrders, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_purchase_orders: #{e}"
@@ -13905,6 +14837,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPurchaseOrders_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14003,9 +14955,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 quote_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+  response = xero_client.accounting_api.create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_quote_attachment_by_file_name: #{e}"
@@ -14106,6 +15059,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createQuoteAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14176,6 +15149,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 quote_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -14186,7 +15160,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_quote_history(xero_tenant_id, quote_id, historyRecords)
+  response = xero_client.accounting_api.create_quote_history(xero_tenant_id, quote_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_quote_history: #{e}"
@@ -14264,6 +15238,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createQuoteHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14334,6 +15328,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 contact = { 
@@ -14360,7 +15355,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_quotes(xero_tenant_id, quotes, summarize_errors)
+  response = xero_client.accounting_api.create_quotes(xero_tenant_id, quotes, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_quotes: #{e}"
@@ -14405,6 +15400,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createQuotes_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14502,6 +15517,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   contact_id: "00000000-0000-0000-0000-000000000000"
@@ -14533,7 +15549,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_receipt(xero_tenant_id, receipts, unitdp)
+  response = xero_client.accounting_api.create_receipt(xero_tenant_id, receipts, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_receipt: #{e}"
@@ -14578,6 +15594,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createReceipt_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14676,9 +15712,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 receipt_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
+  response = xero_client.accounting_api.create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_receipt_attachment_by_file_name: #{e}"
@@ -14779,6 +15816,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createReceiptAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -14849,6 +15906,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 receipt_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -14859,7 +15917,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_receipt_history(xero_tenant_id, receipt_id, historyRecords)
+  response = xero_client.accounting_api.create_receipt_history(xero_tenant_id, receipt_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_receipt_history: #{e}"
@@ -14937,6 +15995,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createReceiptHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15008,9 +16086,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+  response = xero_client.accounting_api.create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_repeating_invoice_attachment_by_file_name: #{e}"
@@ -15111,6 +16190,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createRepeatingInvoiceAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15181,6 +16280,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 history_record = { 
   details: "Hello World"
@@ -15191,7 +16291,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, historyRecords)
+  response = xero_client.accounting_api.create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, historyRecords, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_repeating_invoice_history: #{e}"
@@ -15269,6 +16369,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createRepeatingInvoiceHistory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15339,9 +16459,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_repeating_invoices(xero_tenant_id, repeatingInvoices, summarize_errors)
+  response = xero_client.accounting_api.create_repeating_invoices(xero_tenant_id, repeatingInvoices, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_repeating_invoices: #{e}"
@@ -15386,6 +16507,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createRepeatingInvoices_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15482,6 +16623,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 tax_component = { 
   name: "State Tax",
@@ -15499,7 +16641,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.create_tax_rates(xero_tenant_id, taxRates)
+  response = xero_client.accounting_api.create_tax_rates(xero_tenant_id, taxRates, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_tax_rates: #{e}"
@@ -15544,6 +16686,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTaxRates_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15613,13 +16775,14 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 trackingCategory = { 
   name: "Foobar"
 }  
 
 begin
-  response = xero_client.accounting_api.create_tracking_category(xero_tenant_id, trackingCategory)
+  response = xero_client.accounting_api.create_tracking_category(xero_tenant_id, trackingCategory, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_tracking_category: #{e}"
@@ -15664,6 +16827,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTrackingCategory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -15734,13 +16917,14 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 tracking_category_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 trackingOption = { 
   name: "Foobar"
 }  
 
 begin
-  response = xero_client.accounting_api.create_tracking_options(xero_tenant_id, tracking_category_id, trackingOption)
+  response = xero_client.accounting_api.create_tracking_options(xero_tenant_id, tracking_category_id, trackingOption, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_tracking_options: #{e}"
@@ -15818,6 +17002,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTrackingOptions_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -16000,6 +17204,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 batchPaymentDelete = { 
   status: "DELETED"
@@ -16008,7 +17213,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.delete_batch_payment(xero_tenant_id, batchPaymentDelete)
+  response = xero_client.accounting_api.delete_batch_payment(xero_tenant_id, batchPaymentDelete, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling delete_batch_payment: #{e}"
@@ -16053,6 +17258,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_deleteBatchPayment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -16122,9 +17347,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 batch_payment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batchPaymentDeleteByUrlParam)
+  response = xero_client.accounting_api.delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batchPaymentDeleteByUrlParam, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling delete_batch_payment_by_url_param: #{e}"
@@ -16202,6 +17428,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_deleteBatchPaymentByUrlParam_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -16497,11 +17743,11 @@ <h2>Parameters</h2>
                 </article>
               </div>
               <hr>
-              <div id="api-Accounting-deleteItem">
-                <article id="api-Accounting-deleteItem-0" data-group="User" data-name="deleteItem" data-version="0">
+              <div id="api-Accounting-deleteCreditNoteAllocations">
+                <article id="api-Accounting-deleteCreditNoteAllocations-0" data-group="User" data-name="deleteCreditNoteAllocations" data-version="0">
                   <div class="pull-left">
-                    <h1>deleteItem</h1>
-                    <p>Deletes a specific item</p>
+                    <h1>deleteCreditNoteAllocations</h1>
+                    <p>Deletes an Allocation from a Credit Note</p>
                   </div>
                   <div class="pull-right"></div>
                   <div class="clearfix"></div>
@@ -16509,27 +17755,28 @@ <h1>deleteItem</h1>
                   <p class="marked"></p>
                   <p></p>
                   <br />
-                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/Items/{ItemID}</span></code></pre>
+                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/CreditNotes/{CreditNoteID}/Allocations/{AllocationID}</span></code></pre>
                   <p>
                   <h3>Usage and SDK Samples</h3>
                   </p>
                   <ul class="nav nav-tabs nav-tabs-examples">
                     <!-- *****REPLACE***** comment out the other languages <li> -->
-                    <li class=""><a href="#examples-Accounting-deleteItem-0-ruby">Ruby</a></li>
+                    <li class=""><a href="#examples-Accounting-deleteCreditNoteAllocations-0-ruby">Ruby</a></li>
                   </ul>
                   <div class="tab-content">
                     <!-- *****REPLACE***** comment out the other languages tab-pane -->
-                    <div class="tab-pane" id="examples-Accounting-deleteItem-0-ruby">
+                    <div class="tab-pane" id="examples-Accounting-deleteCreditNoteAllocations-0-ruby">
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
-item_id = '00000000-0000-0000-0000-000000000000'
+credit_note_id = '00000000-0000-0000-0000-000000000000'
+allocation_id = '00000000-0000-0000-0000-000000000000'
 
 begin
-  response = xero_client.accounting_api.delete_item(xero_tenant_id, item_id)
+  response = xero_client.accounting_api.delete_credit_note_allocations(xero_tenant_id, credit_note_id, allocation_id)
   return response
 rescue XeroRuby::ApiError => e
-  puts "Exception when calling delete_item: #{e}"
+  puts "Exception when calling delete_credit_note_allocations: #{e}"
 end
 </code></pre>
                     </div>
@@ -16538,8 +17785,8 @@ <h2>Scopes</h2>
                   <table>
                     
                     <tr>
-                      <td>accounting.settings</td>
-                      <td>Grant read-write access to organisation and account settings</td>
+                      <td>accounting.transactions</td>
+                      <td>Grant read-write access to bank transactions, credit notes, invoices, repeating invoices</td>
                     </tr>
                     
                   </table>
@@ -16550,11 +17797,11 @@ <h2>Parameters</h2>
                       <th width="150px">Name</th>
                       <th>Description</th>
                     </tr>
-                    <tr><td style="width:150px;">ItemID<span style="color:red;">*</span></td>
+                    <tr><td style="width:150px;">CreditNoteID<span style="color:red;">*</span></td>
 <td>
 
 
-    <div id="d2e199_deleteItem_itemID">
+    <div id="d2e199_deleteCreditNoteAllocations_creditNoteID">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -16565,7 +17812,33 @@ <h2>Parameters</h2>
                     </span>
 
                     <div class="inner description marked">
-Unique identifier for an Item
+Unique identifier for a Credit Note
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">AllocationID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteCreditNoteAllocations_allocationID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for Allocation object
                     </div>
             </div>
                 <div class="inner required">
@@ -16587,7 +17860,7 @@ <h2>Parameters</h2>
 <td>
 
 
-    <div id="d2e199_deleteItem_xeroTenantId">
+    <div id="d2e199_deleteCreditNoteAllocations_xeroTenantId">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -16610,11 +17883,11 @@ <h2>Parameters</h2>
                 </article>
               </div>
               <hr>
-              <div id="api-Accounting-deleteLinkedTransaction">
-                <article id="api-Accounting-deleteLinkedTransaction-0" data-group="User" data-name="deleteLinkedTransaction" data-version="0">
+              <div id="api-Accounting-deleteItem">
+                <article id="api-Accounting-deleteItem-0" data-group="User" data-name="deleteItem" data-version="0">
                   <div class="pull-left">
-                    <h1>deleteLinkedTransaction</h1>
-                    <p>Deletes a specific linked transactions (billable expenses)</p>
+                    <h1>deleteItem</h1>
+                    <p>Deletes a specific item</p>
                   </div>
                   <div class="pull-right"></div>
                   <div class="clearfix"></div>
@@ -16622,27 +17895,27 @@ <h1>deleteLinkedTransaction</h1>
                   <p class="marked"></p>
                   <p></p>
                   <br />
-                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/LinkedTransactions/{LinkedTransactionID}</span></code></pre>
+                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/Items/{ItemID}</span></code></pre>
                   <p>
                   <h3>Usage and SDK Samples</h3>
                   </p>
                   <ul class="nav nav-tabs nav-tabs-examples">
                     <!-- *****REPLACE***** comment out the other languages <li> -->
-                    <li class=""><a href="#examples-Accounting-deleteLinkedTransaction-0-ruby">Ruby</a></li>
+                    <li class=""><a href="#examples-Accounting-deleteItem-0-ruby">Ruby</a></li>
                   </ul>
                   <div class="tab-content">
                     <!-- *****REPLACE***** comment out the other languages tab-pane -->
-                    <div class="tab-pane" id="examples-Accounting-deleteLinkedTransaction-0-ruby">
+                    <div class="tab-pane" id="examples-Accounting-deleteItem-0-ruby">
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
-linked_transaction_id = '00000000-0000-0000-0000-000000000000'
+item_id = '00000000-0000-0000-0000-000000000000'
 
 begin
-  response = xero_client.accounting_api.delete_linked_transaction(xero_tenant_id, linked_transaction_id)
+  response = xero_client.accounting_api.delete_item(xero_tenant_id, item_id)
   return response
 rescue XeroRuby::ApiError => e
-  puts "Exception when calling delete_linked_transaction: #{e}"
+  puts "Exception when calling delete_item: #{e}"
 end
 </code></pre>
                     </div>
@@ -16651,8 +17924,8 @@ <h2>Scopes</h2>
                   <table>
                     
                     <tr>
-                      <td>accounting.transactions</td>
-                      <td>Grant read-write access to bank transactions, credit notes, invoices, repeating invoices</td>
+                      <td>accounting.settings</td>
+                      <td>Grant read-write access to organisation and account settings</td>
                     </tr>
                     
                   </table>
@@ -16663,11 +17936,11 @@ <h2>Parameters</h2>
                       <th width="150px">Name</th>
                       <th>Description</th>
                     </tr>
-                    <tr><td style="width:150px;">LinkedTransactionID<span style="color:red;">*</span></td>
+                    <tr><td style="width:150px;">ItemID<span style="color:red;">*</span></td>
 <td>
 
 
-    <div id="d2e199_deleteLinkedTransaction_linkedTransactionID">
+    <div id="d2e199_deleteItem_itemID">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -16678,7 +17951,120 @@ <h2>Parameters</h2>
                     </span>
 
                     <div class="inner description marked">
-Unique identifier for a LinkedTransaction
+Unique identifier for an Item
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteItem_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                </article>
+              </div>
+              <hr>
+              <div id="api-Accounting-deleteLinkedTransaction">
+                <article id="api-Accounting-deleteLinkedTransaction-0" data-group="User" data-name="deleteLinkedTransaction" data-version="0">
+                  <div class="pull-left">
+                    <h1>deleteLinkedTransaction</h1>
+                    <p>Deletes a specific linked transactions (billable expenses)</p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/LinkedTransactions/{LinkedTransactionID}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-deleteLinkedTransaction-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-deleteLinkedTransaction-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+linked_transaction_id = '00000000-0000-0000-0000-000000000000'
+
+begin
+  response = xero_client.accounting_api.delete_linked_transaction(xero_tenant_id, linked_transaction_id)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling delete_linked_transaction: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.transactions</td>
+                      <td>Grant read-write access to bank transactions, credit notes, invoices, repeating invoices</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">LinkedTransactionID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteLinkedTransaction_linkedTransactionID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for a LinkedTransaction
                     </div>
             </div>
                 <div class="inner required">
@@ -16717,6 +18103,146 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                  </table>
+                </article>
+              </div>
+              <hr>
+              <div id="api-Accounting-deleteOverpaymentAllocations">
+                <article id="api-Accounting-deleteOverpaymentAllocations-0" data-group="User" data-name="deleteOverpaymentAllocations" data-version="0">
+                  <div class="pull-left">
+                    <h1>deleteOverpaymentAllocations</h1>
+                    <p>Deletes an Allocation from an overpayment</p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/Overpayments/{OverpaymentID}/Allocations/{AllocationID}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-deleteOverpaymentAllocations-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-deleteOverpaymentAllocations-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+overpayment_id = '00000000-0000-0000-0000-000000000000'
+allocation_id = '00000000-0000-0000-0000-000000000000'
+
+begin
+  response = xero_client.accounting_api.delete_overpayment_allocations(xero_tenant_id, overpayment_id, allocation_id)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling delete_overpayment_allocations: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.transactions</td>
+                      <td>Grant read-write access to bank transactions, credit notes, invoices, repeating invoices</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">OverpaymentID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteOverpaymentAllocations_overpaymentID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for a Overpayment
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">AllocationID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteOverpaymentAllocations_allocationID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for Allocation object
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deleteOverpaymentAllocations_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -16750,13 +18276,14 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 payment_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 paymentDelete = { 
   status: "DELETED"
 }  
 
 begin
-  response = xero_client.accounting_api.delete_payment(xero_tenant_id, payment_id, paymentDelete)
+  response = xero_client.accounting_api.delete_payment(xero_tenant_id, payment_id, paymentDelete, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling delete_payment: #{e}"
@@ -16834,6 +18361,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_deletePayment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -16876,6 +18423,146 @@ <h2>Parameters</h2>
                 </article>
               </div>
               <hr>
+              <div id="api-Accounting-deletePrepaymentAllocations">
+                <article id="api-Accounting-deletePrepaymentAllocations-0" data-group="User" data-name="deletePrepaymentAllocations" data-version="0">
+                  <div class="pull-left">
+                    <h1>deletePrepaymentAllocations</h1>
+                    <p>Deletes an Allocation from a Prepayment</p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="delete"><code><span class="pln">/Prepayments/{PrepaymentID}/Allocations/{AllocationID}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-deletePrepaymentAllocations-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-deletePrepaymentAllocations-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+prepayment_id = '00000000-0000-0000-0000-000000000000'
+allocation_id = '00000000-0000-0000-0000-000000000000'
+
+begin
+  response = xero_client.accounting_api.delete_prepayment_allocations(xero_tenant_id, prepayment_id, allocation_id)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling delete_prepayment_allocations: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.transactions</td>
+                      <td>Grant read-write access to bank transactions, credit notes, invoices, repeating invoices</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">PrepaymentID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deletePrepaymentAllocations_prepaymentID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for a PrePayment
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">AllocationID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deletePrepaymentAllocations_allocationID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for Allocation object
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_deletePrepaymentAllocations_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                </article>
+              </div>
+              <hr>
               <div id="api-Accounting-deleteTrackingCategory">
                 <article id="api-Accounting-deleteTrackingCategory-0" data-group="User" data-name="deleteTrackingCategory" data-version="0">
                   <div class="pull-left">
@@ -17156,11 +18843,12 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 invoice_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 requestEmpty = { }
 
 begin
-  response = xero_client.accounting_api.email_invoice(xero_tenant_id, invoice_id, requestEmpty)
+  response = xero_client.accounting_api.email_invoice(xero_tenant_id, invoice_id, requestEmpty, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling email_invoice: #{e}"
@@ -17238,6 +18926,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_emailInvoice_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -29376,6 +31084,172 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                  </table>
+                </article>
+              </div>
+              <hr>
+              <div id="api-Accounting-getPurchaseOrderAttachmentByFileName">
+                <article id="api-Accounting-getPurchaseOrderAttachmentByFileName-0" data-group="User" data-name="getPurchaseOrderAttachmentByFileName" data-version="0">
+                  <div class="pull-left">
+                    <h1>getPurchaseOrderAttachmentByFileName</h1>
+                    <p>Retrieves a specific attachment for a specific purchase order by filename</p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="get"><code><span class="pln">/PurchaseOrders/{PurchaseOrderID}/Attachments/{FileName}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-getPurchaseOrderAttachmentByFileName-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-getPurchaseOrderAttachmentByFileName-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+purchase_order_id = '00000000-0000-0000-0000-000000000000'
+file_name = 'xero-dev.jpg'
+content_type = 'image/jpg'
+
+begin
+  response = xero_client.accounting_api.get_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, content_type)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling get_purchase_order_attachment_by_file_name: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.attachments</td>
+                      <td>Grant read-write access to attachments</td>
+                    </tr>
+                    
+                    <tr>
+                      <td>accounting.attachments.read</td>
+                      <td>Grant read-only access to attachments</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">PurchaseOrderID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_getPurchaseOrderAttachmentByFileName_purchaseOrderID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for an Purchase Order
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_getPurchaseOrderAttachmentByFileName_fileName">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Name of the attachment
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_getPurchaseOrderAttachmentByFileName_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">contentType<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_getPurchaseOrderAttachmentByFileName_contentType">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+The mime type of the attachment file you are retrieving i.e image/jpg, application/pdf
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -30116,172 +31990,6 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
-</tr>
-
-                  </table>
-                </article>
-              </div>
-              <hr>
-              <div id="api-Accounting-getPurchaseOrder≠AttachmentByFileName">
-                <article id="api-Accounting-getPurchaseOrder≠AttachmentByFileName-0" data-group="User" data-name="getPurchaseOrder≠AttachmentByFileName" data-version="0">
-                  <div class="pull-left">
-                    <h1>getPurchaseOrder≠AttachmentByFileName</h1>
-                    <p>Retrieves a specific attachment for a specific purchase order by filename</p>
-                  </div>
-                  <div class="pull-right"></div>
-                  <div class="clearfix"></div>
-                  <p></p>
-                  <p class="marked"></p>
-                  <p></p>
-                  <br />
-                  <pre class="prettyprint language-html prettyprinted" data-type="get"><code><span class="pln">/PurchaseOrders/{PurchaseOrderID}/Attachments/{FileName}</span></code></pre>
-                  <p>
-                  <h3>Usage and SDK Samples</h3>
-                  </p>
-                  <ul class="nav nav-tabs nav-tabs-examples">
-                    <!-- *****REPLACE***** comment out the other languages <li> -->
-                    <li class=""><a href="#examples-Accounting-getPurchaseOrder≠AttachmentByFileName-0-ruby">Ruby</a></li>
-                  </ul>
-                  <div class="tab-content">
-                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
-                    <div class="tab-pane" id="examples-Accounting-getPurchaseOrder≠AttachmentByFileName-0-ruby">
-                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
-
-xero_tenant_id = 'YOUR_XERO_TENANT_ID'
-purchase_order_id = '00000000-0000-0000-0000-000000000000'
-file_name = 'xero-dev.jpg'
-content_type = 'image/jpg'
-
-begin
-  response = xero_client.accounting_api.get_purchase_order≠attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, content_type)
-  return response
-rescue XeroRuby::ApiError => e
-  puts "Exception when calling get_purchase_order≠attachment_by_file_name: #{e}"
-end
-</code></pre>
-                    </div>
-                  </div>
-                  <h2>Scopes</h2>
-                  <table>
-                    
-                    <tr>
-                      <td>accounting.attachments</td>
-                      <td>Grant read-write access to attachments</td>
-                    </tr>
-                    
-                    <tr>
-                      <td>accounting.attachments.read</td>
-                      <td>Grant read-only access to attachments</td>
-                    </tr>
-                    
-                  </table>
-                  <h2>Parameters</h2>
-                  <div class="methodsubtabletitle">Path parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">PurchaseOrderID<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_getPurchaseOrder≠AttachmentByFileName_purchaseOrderID">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    UUID
-                </span>
-                    <span class="format">
-                        (uuid)
-                    </span>
-
-                    <div class="inner description marked">
-Unique identifier for an Purchase Order
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_getPurchaseOrder≠AttachmentByFileName_fileName">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    String
-                </span>
-
-                    <div class="inner description marked">
-Name of the attachment
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                  </table>
-                  <div class="methodsubtabletitle">Header parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_getPurchaseOrder≠AttachmentByFileName_xeroTenantId">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    String
-                </span>
-
-                    <div class="inner description marked">
-Xero identifier for Tenant
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                    <tr><td style="width:150px;">contentType<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_getPurchaseOrder≠AttachmentByFileName_contentType">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    String
-                </span>
-
-                    <div class="inner description marked">
-The mime type of the attachment file you are retrieving i.e image/jpg, application/pdf
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
 </tr>
 
                   </table>
@@ -35594,6 +37302,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 account = { 
   code: "123",
@@ -35616,7 +37325,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.post_setup(xero_tenant_id, setup)
+  response = xero_client.accounting_api.post_setup(xero_tenant_id, setup, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling post_setup: #{e}"
@@ -35661,6 +37370,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_postSetup_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -35731,6 +37460,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 account_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 account = { 
   code: "123456",
@@ -35745,7 +37475,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_account(xero_tenant_id, account_id, accounts)
+  response = xero_client.accounting_api.update_account(xero_tenant_id, account_id, accounts, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_account: #{e}"
@@ -35823,6 +37553,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateAccount_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -35894,9 +37644,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 account_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body)
+  response = xero_client.accounting_api.update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_account_attachment_by_file_name: #{e}"
@@ -35997,6 +37748,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateAccountAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -36068,6 +37839,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transaction_id = '00000000-0000-0000-0000-000000000000'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   contact_id: "00000000-0000-0000-0000-000000000000"
@@ -36099,7 +37871,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_bank_transaction(xero_tenant_id, bank_transaction_id, bankTransactions, unitdp)
+  response = xero_client.accounting_api.update_bank_transaction(xero_tenant_id, bank_transaction_id, bankTransactions, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_bank_transaction: #{e}"
@@ -36177,6 +37949,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateBankTransaction_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -36274,9 +38066,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 bank_transaction_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body)
+  response = xero_client.accounting_api.update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_bank_transaction_attachment_by_file_name: #{e}"
@@ -36360,7 +38153,202 @@ <h2>Parameters</h2>
 <td>
 
 
-    <div id="d2e199_updateBankTransactionAttachmentByFileName_xeroTenantId">
+    <div id="d2e199_updateBankTransactionAttachmentByFileName_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateBankTransactionAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Body parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr>
+  <td style="width:150px;">body <span style="color:red;">*</span></td>
+  <td>
+    <div class="json-schema-view">
+      <div class="primitive">
+        <span class="type">
+        byte[]
+        </span>
+        <div class="inner description marked">
+          Byte array of file in body of request
+        </div>
+      </div>
+      <div class="inner required">
+        Required
+      </div>
+    </div>
+    <script type="application/ld+json">
+      {
+  "description" : "Byte array of file in body of request",
+  "content" : {
+    "application/octet-stream" : {
+      "schema" : {
+        "type" : "string",
+        "format" : "byte"
+      }
+    }
+  },
+  "required" : true
+}
+    </script>
+                  </table>
+                </article>
+              </div>
+              <hr>
+              <div id="api-Accounting-updateBankTransferAttachmentByFileName">
+                <article id="api-Accounting-updateBankTransferAttachmentByFileName-0" data-group="User" data-name="updateBankTransferAttachmentByFileName" data-version="0">
+                  <div class="pull-left">
+                    <h1>updateBankTransferAttachmentByFileName</h1>
+                    <p></p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="post"><code><span class="pln">/BankTransfers/{BankTransferID}/Attachments/{FileName}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-updateBankTransferAttachmentByFileName-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-updateBankTransferAttachmentByFileName-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+bank_transfer_id = '00000000-0000-0000-0000-000000000000'
+file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
+body = File.read('assets/images/xero-api.png')
+begin
+  response = xero_client.accounting_api.update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, idempotency_key)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling update_bank_transfer_attachment_by_file_name: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.attachments</td>
+                      <td>Grant read-write access to attachments</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">BankTransferID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_updateBankTransferAttachmentByFileName_bankTransferID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Xero generated unique identifier for a bank transfer
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_updateBankTransferAttachmentByFileName_fileName">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Name of the attachment
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_updateBankTransferAttachmentByFileName_xeroTenantId">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -36379,162 +38367,11 @@ <h2>Parameters</h2>
 </td>
 </tr>
 
-                  </table>
-                  <div class="methodsubtabletitle">Body parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr>
-  <td style="width:150px;">body <span style="color:red;">*</span></td>
-  <td>
-    <div class="json-schema-view">
-      <div class="primitive">
-        <span class="type">
-        byte[]
-        </span>
-        <div class="inner description marked">
-          Byte array of file in body of request
-        </div>
-      </div>
-      <div class="inner required">
-        Required
-      </div>
-    </div>
-    <script type="application/ld+json">
-      {
-  "description" : "Byte array of file in body of request",
-  "content" : {
-    "application/octet-stream" : {
-      "schema" : {
-        "type" : "string",
-        "format" : "byte"
-      }
-    }
-  },
-  "required" : true
-}
-    </script>
-                  </table>
-                </article>
-              </div>
-              <hr>
-              <div id="api-Accounting-updateBankTransferAttachmentByFileName">
-                <article id="api-Accounting-updateBankTransferAttachmentByFileName-0" data-group="User" data-name="updateBankTransferAttachmentByFileName" data-version="0">
-                  <div class="pull-left">
-                    <h1>updateBankTransferAttachmentByFileName</h1>
-                    <p></p>
-                  </div>
-                  <div class="pull-right"></div>
-                  <div class="clearfix"></div>
-                  <p></p>
-                  <p class="marked"></p>
-                  <p></p>
-                  <br />
-                  <pre class="prettyprint language-html prettyprinted" data-type="post"><code><span class="pln">/BankTransfers/{BankTransferID}/Attachments/{FileName}</span></code></pre>
-                  <p>
-                  <h3>Usage and SDK Samples</h3>
-                  </p>
-                  <ul class="nav nav-tabs nav-tabs-examples">
-                    <!-- *****REPLACE***** comment out the other languages <li> -->
-                    <li class=""><a href="#examples-Accounting-updateBankTransferAttachmentByFileName-0-ruby">Ruby</a></li>
-                  </ul>
-                  <div class="tab-content">
-                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
-                    <div class="tab-pane" id="examples-Accounting-updateBankTransferAttachmentByFileName-0-ruby">
-                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
-
-xero_tenant_id = 'YOUR_XERO_TENANT_ID'
-bank_transfer_id = '00000000-0000-0000-0000-000000000000'
-file_name = 'xero-dev.jpg'
-body = File.read('assets/images/xero-api.png')
-begin
-  response = xero_client.accounting_api.update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body)
-  return response
-rescue XeroRuby::ApiError => e
-  puts "Exception when calling update_bank_transfer_attachment_by_file_name: #{e}"
-end
-</code></pre>
-                    </div>
-                  </div>
-                  <h2>Scopes</h2>
-                  <table>
-                    
-                    <tr>
-                      <td>accounting.attachments</td>
-                      <td>Grant read-write access to attachments</td>
-                    </tr>
-                    
-                  </table>
-                  <h2>Parameters</h2>
-                  <div class="methodsubtabletitle">Path parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">BankTransferID<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_updateBankTransferAttachmentByFileName_bankTransferID">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    UUID
-                </span>
-                    <span class="format">
-                        (uuid)
-                    </span>
-
-                    <div class="inner description marked">
-Xero generated unique identifier for a bank transfer
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_updateBankTransferAttachmentByFileName_fileName">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    String
-                </span>
-
-                    <div class="inner description marked">
-Name of the attachment
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                  </table>
-                  <div class="methodsubtabletitle">Header parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+                    <tr><td style="width:150px;">Idempotency-Key</td>
 <td>
 
 
-    <div id="d2e199_updateBankTransferAttachmentByFileName_xeroTenantId">
+    <div id="d2e199_updateBankTransferAttachmentByFileName_idempotencyKey">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -36542,12 +38379,9 @@ <h2>Parameters</h2>
                 </span>
 
                     <div class="inner description marked">
-Xero identifier for Tenant
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
                     </div>
             </div>
-                <div class="inner required">
-                    Required
-                </div>
         </div>
     </div>
 </td>
@@ -36621,6 +38455,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   name: "Thanos",
@@ -36632,7 +38467,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_contact(xero_tenant_id, contact_id, contacts)
+  response = xero_client.accounting_api.update_contact(xero_tenant_id, contact_id, contacts, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_contact: #{e}"
@@ -36710,6 +38545,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateContact_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -36781,9 +38636,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body)
+  response = xero_client.accounting_api.update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_contact_attachment_by_file_name: #{e}"
@@ -36884,6 +38740,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateContactAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -36954,6 +38830,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 contact_group_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 contact_group = { 
   name: "Vendor"
@@ -36964,7 +38841,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_contact_group(xero_tenant_id, contact_group_id, contactGroups)
+  response = xero_client.accounting_api.update_contact_group(xero_tenant_id, contact_group_id, contactGroups, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_contact_group: #{e}"
@@ -37042,6 +38919,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateContactGroup_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -37113,6 +39010,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 credit_note_id = '00000000-0000-0000-0000-000000000000'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 contact = { 
@@ -37142,7 +39040,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_credit_note(xero_tenant_id, credit_note_id, creditNotes, unitdp)
+  response = xero_client.accounting_api.update_credit_note(xero_tenant_id, credit_note_id, creditNotes, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_credit_note: #{e}"
@@ -37220,6 +39118,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateCreditNote_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -37318,9 +39236,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 credit_note_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body)
+  response = xero_client.accounting_api.update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_credit_note_attachment_by_file_name: #{e}"
@@ -37421,6 +39340,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateCreditNoteAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -37491,6 +39430,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 expense_claim_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 user = { 
@@ -37515,7 +39455,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_expense_claim(xero_tenant_id, expense_claim_id, expenseClaims)
+  response = xero_client.accounting_api.update_expense_claim(xero_tenant_id, expense_claim_id, expenseClaims, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_expense_claim: #{e}"
@@ -37593,6 +39533,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateExpenseClaim_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -37663,6 +39623,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 invoice_id = '00000000-0000-0000-0000-000000000000'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 invoice = { 
   reference: "I am Iron man"
@@ -37673,7 +39634,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_invoice(xero_tenant_id, invoice_id, invoices, unitdp)
+  response = xero_client.accounting_api.update_invoice(xero_tenant_id, invoice_id, invoices, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_invoice: #{e}"
@@ -37751,6 +39712,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateInvoice_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -37848,9 +39829,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 invoice_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body)
+  response = xero_client.accounting_api.update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_invoice_attachment_by_file_name: #{e}"
@@ -37951,6 +39933,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateInvoiceAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38022,6 +40024,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 item_id = '00000000-0000-0000-0000-000000000000'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 item = { 
   code: "ItemCode123",
@@ -38033,7 +40036,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_item(xero_tenant_id, item_id, items, unitdp)
+  response = xero_client.accounting_api.update_item(xero_tenant_id, item_id, items, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_item: #{e}"
@@ -38111,6 +40114,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateItem_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38207,6 +40230,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 linked_transaction_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 linked_transaction = { 
   source_line_item_id: "00000000-0000-0000-0000-000000000000",
@@ -38218,7 +40242,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_linked_transaction(xero_tenant_id, linked_transaction_id, linkedTransactions)
+  response = xero_client.accounting_api.update_linked_transaction(xero_tenant_id, linked_transaction_id, linkedTransactions, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_linked_transaction: #{e}"
@@ -38296,6 +40320,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateLinkedTransaction_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38365,6 +40409,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 manual_journal_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'  
 manual_journal_lines = []
 
@@ -38393,7 +40438,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_manual_journal(xero_tenant_id, manual_journal_id, manualJournals)
+  response = xero_client.accounting_api.update_manual_journal(xero_tenant_id, manual_journal_id, manualJournals, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_manual_journal: #{e}"
@@ -38471,6 +40516,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateManualJournal_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38541,9 +40606,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 manual_journal_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body)
+  response = xero_client.accounting_api.update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_manual_journal_attachment_by_file_name: #{e}"
@@ -38644,6 +40710,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateManualJournalAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38715,6 +40801,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 contact = { 
   contact_id: "00000000-0000-0000-0000-000000000000"
@@ -38745,7 +40832,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_bank_transactions(xero_tenant_id, bankTransactions, summarize_errors, unitdp)
+  response = xero_client.accounting_api.update_or_create_bank_transactions(xero_tenant_id, bankTransactions, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_bank_transactions: #{e}"
@@ -38790,6 +40877,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateBankTransactions_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -38906,6 +41013,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 phone = { 
   phone_number: "555-1212",
@@ -38925,7 +41033,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_contacts(xero_tenant_id, contacts, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_contacts(xero_tenant_id, contacts, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_contacts: #{e}"
@@ -38970,6 +41078,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateContacts_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39067,6 +41195,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 curr_date = 'YYYY-MM-DD'
 
 contact = { 
@@ -39094,7 +41223,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_credit_notes(xero_tenant_id, creditNotes, summarize_errors, unitdp)
+  response = xero_client.accounting_api.update_or_create_credit_notes(xero_tenant_id, creditNotes, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_credit_notes: #{e}"
@@ -39139,6 +41268,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateCreditNotes_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39256,6 +41405,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 employee = { 
   first_name: "Nick",
@@ -39267,7 +41417,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_employees(xero_tenant_id, employees, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_employees(xero_tenant_id, employees, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_employees: #{e}"
@@ -39312,6 +41462,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateEmployees_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39410,6 +41580,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 due_date_value = 'YYYY-MM-DD'
 
@@ -39441,7 +41612,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_invoices(xero_tenant_id, invoices, summarize_errors, unitdp)
+  response = xero_client.accounting_api.update_or_create_invoices(xero_tenant_id, invoices, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_invoices: #{e}"
@@ -39486,6 +41657,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateInvoices_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39603,6 +41794,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 
 item = { 
   code: "abcXYZ123",
@@ -39615,7 +41807,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_items(xero_tenant_id, items, summarize_errors, unitdp)
+  response = xero_client.accounting_api.update_or_create_items(xero_tenant_id, items, summarize_errors, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_items: #{e}"
@@ -39660,6 +41852,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateItems_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39776,6 +41988,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'  
 manual_journal_lines = []
 
@@ -39804,7 +42017,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_manual_journals(xero_tenant_id, manualJournals, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_manual_journals(xero_tenant_id, manualJournals, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_manual_journals: #{e}"
@@ -39849,6 +42062,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateManualJournals_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -39946,6 +42179,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 contact = { 
@@ -39972,7 +42206,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_purchase_orders(xero_tenant_id, purchaseOrders, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_purchase_orders(xero_tenant_id, purchaseOrders, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_purchase_orders: #{e}"
@@ -40017,6 +42251,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreatePurchaseOrders_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40113,6 +42367,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 contact = { 
@@ -40139,7 +42394,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_or_create_quotes(xero_tenant_id, quotes, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_quotes(xero_tenant_id, quotes, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_quotes: #{e}"
@@ -40184,6 +42439,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateQuotes_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40280,9 +42555,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 summarize_errors = true
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_or_create_repeating_invoices(xero_tenant_id, repeatingInvoices, summarize_errors)
+  response = xero_client.accounting_api.update_or_create_repeating_invoices(xero_tenant_id, repeatingInvoices, summarize_errors, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_or_create_repeating_invoices: #{e}"
@@ -40327,6 +42603,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateOrCreateRepeatingInvoices_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40424,6 +42720,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 purchase_order_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 purchase_order = { 
   attentionTo: "Peter Parker"
@@ -40434,7 +42731,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_purchase_order(xero_tenant_id, purchase_order_id, purchaseOrders)
+  response = xero_client.accounting_api.update_purchase_order(xero_tenant_id, purchase_order_id, purchaseOrders, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_purchase_order: #{e}"
@@ -40512,6 +42809,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePurchaseOrder_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40582,9 +42899,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 purchase_order_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body)
+  response = xero_client.accounting_api.update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_purchase_order_attachment_by_file_name: #{e}"
@@ -40685,6 +43003,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePurchaseOrderAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40755,6 +43093,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 quote_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 date_value = 'YYYY-MM-DD'
 
 contact = { 
@@ -40772,7 +43111,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_quote(xero_tenant_id, quote_id, quotes)
+  response = xero_client.accounting_api.update_quote(xero_tenant_id, quote_id, quotes, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_quote: #{e}"
@@ -40850,6 +43189,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateQuote_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -40920,9 +43279,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 quote_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body)
+  response = xero_client.accounting_api.update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_quote_attachment_by_file_name: #{e}"
@@ -41023,6 +43383,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateQuoteAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -41094,6 +43474,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 receipt_id = '00000000-0000-0000-0000-000000000000'
 unitdp = 4
+idempotency_key = 'KEY_VALUE'
 dateValue = 'YYYY-MM-DD'
 
 user = { 
@@ -41111,7 +43492,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_receipt(xero_tenant_id, receipt_id, receipts, unitdp)
+  response = xero_client.accounting_api.update_receipt(xero_tenant_id, receipt_id, receipts, unitdp, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_receipt: #{e}"
@@ -41161,18 +43542,209 @@ <h2>Parameters</h2>
 </td>
 </tr>
 
-                  </table>
-                  <div class="methodsubtabletitle">Header parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_updateReceipt_xeroTenantId">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+Xero identifier for Tenant
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateReceipt_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Body parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr>
+  <td style="width:150px;">receipts <span style="color:red;">*</span></td>
+  <td>
+    <div class="json-schema-view">
+      <div class="primitive">
+        <span class="type">
+        Receipts
+        </span>
+        <div class="inner description marked">
+          
+        </div>
+      </div>
+      <div class="inner required">
+        Required
+      </div>
+    </div>
+    <script type="application/ld+json">
+      {
+  "content" : {
+    "application/json" : {
+      "schema" : {
+        "$ref" : "#/components/schemas/Receipts"
+      },
+      "example" : "{ \"Receipts\": [ { \"Lineitems\": [], \"User\": { \"UserID\": \"00000000-0000-0000-0000-000000000000\" }, \"Reference\": \"Foobar\" } ] }"
+    }
+  },
+  "required" : true
+}
+    </script>
+                  </table>
+                  <div class="methodsubtabletitle">Query parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">unitdp</td>
+<td>
+
+
+    <div id="d2e199_updateReceipt_unitdp">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    Integer
+                </span>
+
+                    <div class="inner description marked">
+e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                  </table>
+                </article>
+              </div>
+              <hr>
+              <div id="api-Accounting-updateReceiptAttachmentByFileName">
+                <article id="api-Accounting-updateReceiptAttachmentByFileName-0" data-group="User" data-name="updateReceiptAttachmentByFileName" data-version="0">
+                  <div class="pull-left">
+                    <h1>updateReceiptAttachmentByFileName</h1>
+                    <p>Updates a specific attachment on a specific expense claim receipts by file name</p>
+                  </div>
+                  <div class="pull-right"></div>
+                  <div class="clearfix"></div>
+                  <p></p>
+                  <p class="marked"></p>
+                  <p></p>
+                  <br />
+                  <pre class="prettyprint language-html prettyprinted" data-type="post"><code><span class="pln">/Receipts/{ReceiptID}/Attachments/{FileName}</span></code></pre>
+                  <p>
+                  <h3>Usage and SDK Samples</h3>
+                  </p>
+                  <ul class="nav nav-tabs nav-tabs-examples">
+                    <!-- *****REPLACE***** comment out the other languages <li> -->
+                    <li class=""><a href="#examples-Accounting-updateReceiptAttachmentByFileName-0-ruby">Ruby</a></li>
+                  </ul>
+                  <div class="tab-content">
+                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
+                    <div class="tab-pane" id="examples-Accounting-updateReceiptAttachmentByFileName-0-ruby">
+                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
+
+xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+receipt_id = '00000000-0000-0000-0000-000000000000'
+file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
+body = File.read('assets/images/xero-api.png')
+begin
+  response = xero_client.accounting_api.update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, idempotency_key)
+  return response
+rescue XeroRuby::ApiError => e
+  puts "Exception when calling update_receipt_attachment_by_file_name: #{e}"
+end
+</code></pre>
+                    </div>
+                  </div>
+                  <h2>Scopes</h2>
+                  <table>
+                    
+                    <tr>
+                      <td>accounting.attachments</td>
+                      <td>Grant read-write access to attachments</td>
+                    </tr>
+                    
+                  </table>
+                  <h2>Parameters</h2>
+                  <div class="methodsubtabletitle">Path parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">ReceiptID<span style="color:red;">*</span></td>
+<td>
+
+
+    <div id="d2e199_updateReceiptAttachmentByFileName_receiptID">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    UUID
+                </span>
+                    <span class="format">
+                        (uuid)
+                    </span>
+
+                    <div class="inner description marked">
+Unique identifier for a Receipt
+                    </div>
+            </div>
+                <div class="inner required">
+                    Required
+                </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
 <td>
 
 
-    <div id="d2e199_updateReceipt_xeroTenantId">
+    <div id="d2e199_updateReceiptAttachmentByFileName_fileName">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -41180,7 +43752,7 @@ <h2>Parameters</h2>
                 </span>
 
                     <div class="inner description marked">
-Xero identifier for Tenant
+Name of the attachment
                     </div>
             </div>
                 <div class="inner required">
@@ -41192,157 +43764,17 @@ <h2>Parameters</h2>
 </tr>
 
                   </table>
-                  <div class="methodsubtabletitle">Body parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr>
-  <td style="width:150px;">receipts <span style="color:red;">*</span></td>
-  <td>
-    <div class="json-schema-view">
-      <div class="primitive">
-        <span class="type">
-        Receipts
-        </span>
-        <div class="inner description marked">
-          
-        </div>
-      </div>
-      <div class="inner required">
-        Required
-      </div>
-    </div>
-    <script type="application/ld+json">
-      {
-  "content" : {
-    "application/json" : {
-      "schema" : {
-        "$ref" : "#/components/schemas/Receipts"
-      },
-      "example" : "{ \"Receipts\": [ { \"Lineitems\": [], \"User\": { \"UserID\": \"00000000-0000-0000-0000-000000000000\" }, \"Reference\": \"Foobar\" } ] }"
-    }
-  },
-  "required" : true
-}
-    </script>
-                  </table>
-                  <div class="methodsubtabletitle">Query parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">unitdp</td>
-<td>
-
-
-    <div id="d2e199_updateReceipt_unitdp">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    Integer
-                </span>
-
-                    <div class="inner description marked">
-e.g. unitdp=4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
-                    </div>
-            </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                  </table>
-                </article>
-              </div>
-              <hr>
-              <div id="api-Accounting-updateReceiptAttachmentByFileName">
-                <article id="api-Accounting-updateReceiptAttachmentByFileName-0" data-group="User" data-name="updateReceiptAttachmentByFileName" data-version="0">
-                  <div class="pull-left">
-                    <h1>updateReceiptAttachmentByFileName</h1>
-                    <p>Updates a specific attachment on a specific expense claim receipts by file name</p>
-                  </div>
-                  <div class="pull-right"></div>
-                  <div class="clearfix"></div>
-                  <p></p>
-                  <p class="marked"></p>
-                  <p></p>
-                  <br />
-                  <pre class="prettyprint language-html prettyprinted" data-type="post"><code><span class="pln">/Receipts/{ReceiptID}/Attachments/{FileName}</span></code></pre>
-                  <p>
-                  <h3>Usage and SDK Samples</h3>
-                  </p>
-                  <ul class="nav nav-tabs nav-tabs-examples">
-                    <!-- *****REPLACE***** comment out the other languages <li> -->
-                    <li class=""><a href="#examples-Accounting-updateReceiptAttachmentByFileName-0-ruby">Ruby</a></li>
-                  </ul>
-                  <div class="tab-content">
-                    <!-- *****REPLACE***** comment out the other languages tab-pane -->
-                    <div class="tab-pane" id="examples-Accounting-updateReceiptAttachmentByFileName-0-ruby">
-                      <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
-
-xero_tenant_id = 'YOUR_XERO_TENANT_ID'
-receipt_id = '00000000-0000-0000-0000-000000000000'
-file_name = 'xero-dev.jpg'
-body = File.read('assets/images/xero-api.png')
-begin
-  response = xero_client.accounting_api.update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body)
-  return response
-rescue XeroRuby::ApiError => e
-  puts "Exception when calling update_receipt_attachment_by_file_name: #{e}"
-end
-</code></pre>
-                    </div>
-                  </div>
-                  <h2>Scopes</h2>
-                  <table>
-                    
-                    <tr>
-                      <td>accounting.attachments</td>
-                      <td>Grant read-write access to attachments</td>
-                    </tr>
-                    
-                  </table>
-                  <h2>Parameters</h2>
-                  <div class="methodsubtabletitle">Path parameters</div>
+                  <div class="methodsubtabletitle">Header parameters</div>
                   <table id="methodsubtable">
                     <tr>
                       <th width="150px">Name</th>
                       <th>Description</th>
                     </tr>
-                    <tr><td style="width:150px;">ReceiptID<span style="color:red;">*</span></td>
-<td>
-
-
-    <div id="d2e199_updateReceiptAttachmentByFileName_receiptID">
-        <div class="json-schema-view">
-            <div class="primitive">
-                <span class="type">
-                    UUID
-                </span>
-                    <span class="format">
-                        (uuid)
-                    </span>
-
-                    <div class="inner description marked">
-Unique identifier for a Receipt
-                    </div>
-            </div>
-                <div class="inner required">
-                    Required
-                </div>
-        </div>
-    </div>
-</td>
-</tr>
-
-                    <tr><td style="width:150px;">FileName<span style="color:red;">*</span></td>
+                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
 <td>
 
 
-    <div id="d2e199_updateReceiptAttachmentByFileName_fileName">
+    <div id="d2e199_updateReceiptAttachmentByFileName_xeroTenantId">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -41350,7 +43782,7 @@ <h2>Parameters</h2>
                 </span>
 
                     <div class="inner description marked">
-Name of the attachment
+Xero identifier for Tenant
                     </div>
             </div>
                 <div class="inner required">
@@ -41361,18 +43793,11 @@ <h2>Parameters</h2>
 </td>
 </tr>
 
-                  </table>
-                  <div class="methodsubtabletitle">Header parameters</div>
-                  <table id="methodsubtable">
-                    <tr>
-                      <th width="150px">Name</th>
-                      <th>Description</th>
-                    </tr>
-                    <tr><td style="width:150px;">xero-tenant-id<span style="color:red;">*</span></td>
+                    <tr><td style="width:150px;">Idempotency-Key</td>
 <td>
 
 
-    <div id="d2e199_updateReceiptAttachmentByFileName_xeroTenantId">
+    <div id="d2e199_updateReceiptAttachmentByFileName_idempotencyKey">
         <div class="json-schema-view">
             <div class="primitive">
                 <span class="type">
@@ -41380,12 +43805,9 @@ <h2>Parameters</h2>
                 </span>
 
                     <div class="inner description marked">
-Xero identifier for Tenant
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
                     </div>
             </div>
-                <div class="inner required">
-                    Required
-                </div>
         </div>
     </div>
 </td>
@@ -41459,9 +43881,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeatingInvoices)
+  response = xero_client.accounting_api.update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeatingInvoices, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_repeating_invoice: #{e}"
@@ -41539,6 +43962,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateRepeatingInvoice_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -41609,9 +44052,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 repeating_invoice_id = '00000000-0000-0000-0000-000000000000'
 file_name = 'xero-dev.jpg'
+idempotency_key = 'KEY_VALUE'
 body = File.read('assets/images/xero-api.png')
 begin
-  response = xero_client.accounting_api.update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body)
+  response = xero_client.accounting_api.update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_repeating_invoice_attachment_by_file_name: #{e}"
@@ -41712,6 +44156,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateRepeatingInvoiceAttachmentByFileName_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -41781,6 +44245,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 tax_component = { 
   name: "State Tax",
@@ -41798,7 +44263,7 @@ <h3>Usage and SDK Samples</h3>
 } 
 
 begin
-  response = xero_client.accounting_api.update_tax_rate(xero_tenant_id, taxRates)
+  response = xero_client.accounting_api.update_tax_rate(xero_tenant_id, taxRates, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_tax_rate: #{e}"
@@ -41843,6 +44308,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTaxRate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -41912,13 +44397,14 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 tracking_category_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 trackingCategory = { 
   name: "Foobar"
 }  
 
 begin
-  response = xero_client.accounting_api.update_tracking_category(xero_tenant_id, tracking_category_id, trackingCategory)
+  response = xero_client.accounting_api.update_tracking_category(xero_tenant_id, tracking_category_id, trackingCategory, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_tracking_category: #{e}"
@@ -41996,6 +44482,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTrackingCategory_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -42066,13 +44572,14 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 tracking_category_id = '00000000-0000-0000-0000-000000000000'
 tracking_option_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 trackingOption = { 
   name: "Foobar"
 }  
 
 begin
-  response = xero_client.accounting_api.update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, trackingOption)
+  response = xero_client.accounting_api.update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, trackingOption, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_tracking_options: #{e}"
@@ -42176,6 +44683,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTrackingOptions_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/docs/app_store/AppStoreApi.md b/docs/app_store/AppStoreApi.md
index 7500565a..0d5281d3 100644
--- a/docs/app_store/AppStoreApi.md
+++ b/docs/app_store/AppStoreApi.md
@@ -137,7 +137,7 @@ Name | Type | Description  | Notes
 
 ## post_usage_records
 
-> UsageRecord post_usage_records(subscription_id, subscription_item_id, create_usage_record)
+> UsageRecord post_usage_records(subscription_id, subscription_item_id, create_usage_record, opts)
 
 Send metered usage belonging to this subscription and subscription item
 
@@ -169,9 +169,13 @@ api_instance = xero_client.<api_set>
 subscription_id = '00000000-0000-0000-0000-000000000000' # String | Unique identifier for Subscription object
 subscription_item_id = '00000000-0000-0000-0000-000000000000' # String | The unique identifier of the subscriptionItem
 create_usage_record = { "timestamp": "2022-01-21T13:01:00", "quantity": 10 } # CreateUsageRecord | Contains the quantity for the usage record to create
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Send metered usage belonging to this subscription and subscription item
-  result = api_instance.post_usage_records(subscription_id, subscription_item_id, create_usage_record)
+  result = api_instance.post_usage_records(subscription_id, subscription_item_id, create_usage_record, opts)
   p result
 rescue XeroRuby::AppStore::ApiError => e
   puts "Exception when calling AppStoreApi->post_usage_records: #{e}"
@@ -186,6 +190,7 @@ Name | Type | Description  | Notes
  **subscription_id** | [**String**](.md)| Unique identifier for Subscription object | 
  **subscription_item_id** | [**String**](.md)| The unique identifier of the subscriptionItem | 
  **create_usage_record** | [**CreateUsageRecord**](CreateUsageRecord.md)| Contains the quantity for the usage record to create | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -203,7 +208,7 @@ Name | Type | Description  | Notes
 
 ## put_usage_records
 
-> UsageRecord put_usage_records(subscription_id, subscription_item_id, usage_record_id, update_usage_record)
+> UsageRecord put_usage_records(subscription_id, subscription_item_id, usage_record_id, update_usage_record, opts)
 
 Update and existing metered usage belonging to this subscription and subscription item
 
@@ -236,9 +241,13 @@ subscription_id = '00000000-0000-0000-0000-000000000000' # String | Unique ident
 subscription_item_id = '00000000-0000-0000-0000-000000000000' # String | The unique identifier of the subscriptionItem
 usage_record_id = '00000000-0000-0000-0000-000000000000' # String | The unique identifier of the usage record
 update_usage_record = { "quantity": 10 } # UpdateUsageRecord | Contains the quantity for the usage record to update
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Update and existing metered usage belonging to this subscription and subscription item
-  result = api_instance.put_usage_records(subscription_id, subscription_item_id, usage_record_id, update_usage_record)
+  result = api_instance.put_usage_records(subscription_id, subscription_item_id, usage_record_id, update_usage_record, opts)
   p result
 rescue XeroRuby::AppStore::ApiError => e
   puts "Exception when calling AppStoreApi->put_usage_records: #{e}"
@@ -254,6 +263,7 @@ Name | Type | Description  | Notes
  **subscription_item_id** | [**String**](.md)| The unique identifier of the subscriptionItem | 
  **usage_record_id** | [**String**](.md)| The unique identifier of the usage record | 
  **update_usage_record** | [**UpdateUsageRecord**](UpdateUsageRecord.md)| Contains the quantity for the usage record to update | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/app_store/index.html b/docs/app_store/index.html
index 7e37b0b6..b576138e 100644
--- a/docs/app_store/index.html
+++ b/docs/app_store/index.html
@@ -1241,7 +1241,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="AppStore"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="AppStore"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="AppStore"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="AppStore"><a href="#api-AppStore">Methods</a></li>
               <li data-group="AppStore" data-name="getSubscription" class="">
                 <a href="#api-AppStore-getSubscription">getSubscription</a>
@@ -1464,9 +1464,10 @@ <h3>Usage and SDK Samples</h3>
 
 subscription_id = '00000000-0000-0000-0000-000000000000'
 subscription_item_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.post_usage_records(subscription_id, subscription_item_id, createUsageRecord)
+  response = xero_client.accounting_api.post_usage_records(subscription_id, subscription_item_id, createUsageRecord, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling post_usage_records: #{e}"
@@ -1540,6 +1541,33 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_postUsageRecords_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1611,9 +1639,10 @@ <h3>Usage and SDK Samples</h3>
 subscription_id = '00000000-0000-0000-0000-000000000000'
 subscription_item_id = '00000000-0000-0000-0000-000000000000'
 usage_record_id = '00000000-0000-0000-0000-000000000000'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.put_usage_records(subscription_id, subscription_item_id, usage_record_id, updateUsageRecord)
+  response = xero_client.accounting_api.put_usage_records(subscription_id, subscription_item_id, usage_record_id, updateUsageRecord, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling put_usage_records: #{e}"
@@ -1713,6 +1742,33 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Header parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_putUsageRecords_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/docs/assets/AssetApi.md b/docs/assets/AssetApi.md
index 398d2787..a2a2ed47 100644
--- a/docs/assets/AssetApi.md
+++ b/docs/assets/AssetApi.md
@@ -15,7 +15,7 @@ Method | HTTP request | Description
 
 ## create_asset
 
-> Asset create_asset(xero_tenant_id, asset)
+> Asset create_asset(xero_tenant_id, asset, opts)
 
 adds a fixed asset
 
@@ -48,9 +48,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 asset = { "assetName":"Computer74863", "assetNumber":"123477544", "purchaseDate":"2020-01-01", "purchasePrice":100.0, "disposalPrice":23.23, "assetStatus":"Draft", "bookDepreciationSetting":{ "depreciationMethod":"StraightLine", "averagingMethod":"ActualDays", "depreciationRate":0.5, "depreciationCalculationMethod":"None" }, "bookDepreciationDetail":{ "currentCapitalGain":5.32, "currentGainLoss":3.88, "depreciationStartDate":"2020-01-02", "costLimit":100.0, "currentAccumDepreciationAmount":2.25 }, "AccountingBookValue":99.5 } # Asset | Fixed asset you are creating
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #adds a fixed asset
-  result = api_instance.create_asset(xero_tenant_id, asset)
+  result = api_instance.create_asset(xero_tenant_id, asset, opts)
   p result
 rescue XeroRuby::Assets::ApiError => e
   puts "Exception when calling AssetApi->create_asset: #{e}"
@@ -64,6 +68,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **asset** | [**Asset**](Asset.md)| Fixed asset you are creating | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -81,7 +86,7 @@ Name | Type | Description  | Notes
 
 ## create_asset_type
 
-> AssetType create_asset_type(xero_tenant_id, opts)
+> AssetType create_asset_type(xero_tenant_id, asset_type, opts)
 
 adds a fixed asset type
 
@@ -113,13 +118,14 @@ api_instance = xero_client.<api_set>
 
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
+asset_type = { "assetTypeName":"Machinery11004", "fixedAssetAccountId":"3d8d063a-c148-4bb8-8b3c-a5e2ad3b1e82", "depreciationExpenseAccountId":"d1602f69-f900-4616-8d34-90af393fa368", "accumulatedDepreciationAccountId":"9195cadd-8645-41e6-9f67-7bcd421defe8", "bookDepreciationSetting":{ "depreciationMethod":"DiminishingValue100", "averagingMethod":"ActualDays", "depreciationRate":0.05, "depreciationCalculationMethod":"None" } } # AssetType | Asset type to add
 opts = {
-  asset_type: { "assetTypeName":"Machinery11004", "fixedAssetAccountId":"3d8d063a-c148-4bb8-8b3c-a5e2ad3b1e82", "depreciationExpenseAccountId":"d1602f69-f900-4616-8d34-90af393fa368", "accumulatedDepreciationAccountId":"9195cadd-8645-41e6-9f67-7bcd421defe8", "bookDepreciationSetting":{ "depreciationMethod":"DiminishingValue100", "averagingMethod":"ActualDays", "depreciationRate":0.05, "depreciationCalculationMethod":"None" } } # AssetType | Asset type to add
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #adds a fixed asset type
-  result = api_instance.create_asset_type(xero_tenant_id, opts)
+  result = api_instance.create_asset_type(xero_tenant_id, asset_type, opts)
   p result
 rescue XeroRuby::Assets::ApiError => e
   puts "Exception when calling AssetApi->create_asset_type: #{e}"
@@ -132,7 +138,8 @@ end
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
- **asset_type** | [**AssetType**](AssetType.md)| Asset type to add | [optional] 
+ **asset_type** | [**AssetType**](AssetType.md)| Asset type to add | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/assets/index.html b/docs/assets/index.html
index 19a782c3..507fb77e 100644
--- a/docs/assets/index.html
+++ b/docs/assets/index.html
@@ -1392,7 +1392,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="Asset"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="Asset"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="Asset"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="Asset"><a href="#api-Asset">Methods</a></li>
               <li data-group="Asset" data-name="createAsset" class="">
                 <a href="#api-Asset-createAsset">createAsset</a>
@@ -1456,6 +1456,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 asset = { 
   asset_name: "Other Computer",
@@ -1464,7 +1465,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_asset(xero_tenant_id, asset)
+  response = xero_client.accounting_api.create_asset(xero_tenant_id, asset, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_asset: #{e}"
@@ -1509,6 +1510,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createAsset_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1578,6 +1599,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 book_depreciation_setting = { 
   depreciation_method: "DiminishingValue100",
@@ -1595,7 +1617,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_asset_type(xero_tenant_id, assetType)
+  response = xero_client.accounting_api.create_asset_type(xero_tenant_id, assetType, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_asset_type: #{e}"
@@ -1640,6 +1662,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createAssetType_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1650,7 +1692,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">assetType </td>
+  <td style="width:150px;">assetType <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -1661,6 +1703,9 @@ <h2>Parameters</h2>
           Asset type to add
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1672,7 +1717,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"assetTypeName\":\"Machinery11004\", \"fixedAssetAccountId\":\"3d8d063a-c148-4bb8-8b3c-a5e2ad3b1e82\", \"depreciationExpenseAccountId\":\"d1602f69-f900-4616-8d34-90af393fa368\", \"accumulatedDepreciationAccountId\":\"9195cadd-8645-41e6-9f67-7bcd421defe8\", \"bookDepreciationSetting\":{ \"depreciationMethod\":\"DiminishingValue100\", \"averagingMethod\":\"ActualDays\", \"depreciationRate\":0.05, \"depreciationCalculationMethod\":\"None\" } }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
diff --git a/docs/files/FilesApi.md b/docs/files/FilesApi.md
index 5d175e5b..75c047ff 100644
--- a/docs/files/FilesApi.md
+++ b/docs/files/FilesApi.md
@@ -27,7 +27,7 @@ Method | HTTP request | Description
 
 ## create_file_association
 
-> Association create_file_association(xero_tenant_id, file_id, opts)
+> Association create_file_association(xero_tenant_id, file_id, association, opts)
 
 Creates a new file association
 
@@ -60,13 +60,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 file_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | File id for single object
+association = { "ObjectId": "1270bf7c-5d18-473a-9231-1e36c4bd33ed", "ObjectGroup": "Contact", "ObjectType": "Business" } # Association | 
 opts = {
-  association: { "ObjectId": "1270bf7c-5d18-473a-9231-1e36c4bd33ed", "ObjectGroup": "Contact", "ObjectType": "Business" } # Association | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Creates a new file association
-  result = api_instance.create_file_association(xero_tenant_id, file_id, opts)
+  result = api_instance.create_file_association(xero_tenant_id, file_id, association, opts)
   p result
 rescue XeroRuby::Files::ApiError => e
   puts "Exception when calling FilesApi->create_file_association: #{e}"
@@ -80,7 +81,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **file_id** | [**String**](.md)| File id for single object | 
- **association** | [**Association**](Association.md)|  | [optional] 
+ **association** | [**Association**](Association.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -98,7 +100,7 @@ Name | Type | Description  | Notes
 
 ## create_folder
 
-> Folder create_folder(xero_tenant_id, opts)
+> Folder create_folder(xero_tenant_id, folder, opts)
 
 Creates a new folder
 
@@ -130,13 +132,14 @@ api_instance = xero_client.<api_set>
 
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
+folder = { "Name": "My Docs" } # Folder | 
 opts = {
-  folder: { "Name": "My Docs" } # Folder | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Creates a new folder
-  result = api_instance.create_folder(xero_tenant_id, opts)
+  result = api_instance.create_folder(xero_tenant_id, folder, opts)
   p result
 rescue XeroRuby::Files::ApiError => e
   puts "Exception when calling FilesApi->create_folder: #{e}"
@@ -149,7 +152,8 @@ end
 Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
- **folder** | [**Folder**](Folder.md)|  | [optional] 
+ **folder** | [**Folder**](Folder.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -364,7 +368,7 @@ nil (empty response body)
 
 ## get_associations_by_object
 
-> Array&lt;Association&gt; get_associations_by_object(xero_tenant_id, object_id)
+> Array&lt;Association&gt; get_associations_by_object(xero_tenant_id, object_id, opts)
 
 Retrieves an association object using a unique object ID
 
@@ -397,9 +401,19 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 object_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Object id for single object
+opts = {
+  pagesize: 50, # Integer | pass an optional page size value
+
+  page: 2, # Integer | number of records to skip for pagination
+
+  sort: 'Associations/{ObjectId}?sort=CreatedDateUtc', # String | values to sort by
+
+  direction: 'Associations/{ObjectId}?sort=CreatedDateUtc&direction=DESC' # String | direction to sort by
+}
+
 begin
   #Retrieves an association object using a unique object ID
-  result = api_instance.get_associations_by_object(xero_tenant_id, object_id)
+  result = api_instance.get_associations_by_object(xero_tenant_id, object_id, opts)
   p result
 rescue XeroRuby::Files::ApiError => e
   puts "Exception when calling FilesApi->get_associations_by_object: #{e}"
@@ -413,6 +427,10 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **object_id** | [**String**](.md)| Object id for single object | 
+ **pagesize** | **Integer**| pass an optional page size value | [optional] 
+ **page** | **Integer**| number of records to skip for pagination | [optional] 
+ **sort** | **String**| values to sort by | [optional] 
+ **direction** | **String**| direction to sort by | [optional] 
 
 ### Return type
 
@@ -964,7 +982,7 @@ Name | Type | Description  | Notes
 
 ## update_file
 
-> FileObject update_file(xero_tenant_id, file_id, opts)
+> FileObject update_file(xero_tenant_id, file_id, file_object, opts)
 
 Update a file
 
@@ -997,13 +1015,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 file_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | File id for single object
+file_object = { "FolderId": "bf924975-7097-46f2-a143-1ecfbab3c8c3" } # FileObject | 
 opts = {
-  file_object: { "FolderId": "bf924975-7097-46f2-a143-1ecfbab3c8c3" } # FileObject | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Update a file
-  result = api_instance.update_file(xero_tenant_id, file_id, opts)
+  result = api_instance.update_file(xero_tenant_id, file_id, file_object, opts)
   p result
 rescue XeroRuby::Files::ApiError => e
   puts "Exception when calling FilesApi->update_file: #{e}"
@@ -1017,7 +1036,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **file_id** | [**String**](.md)| File id for single object | 
- **file_object** | [**FileObject**](FileObject.md)|  | [optional] 
+ **file_object** | [**FileObject**](FileObject.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1035,7 +1055,7 @@ Name | Type | Description  | Notes
 
 ## update_folder
 
-> Folder update_folder(xero_tenant_id, folder_id, folder)
+> Folder update_folder(xero_tenant_id, folder_id, folder, opts)
 
 Updates an existing folder
 
@@ -1069,9 +1089,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'YOUR_XERO_TENANT_ID' # String | Xero identifier for Tenant
 folder_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Folder id for single object
 folder = { "Name": "Your Docs" } # Folder | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates an existing folder
-  result = api_instance.update_folder(xero_tenant_id, folder_id, folder)
+  result = api_instance.update_folder(xero_tenant_id, folder_id, folder, opts)
   p result
 rescue XeroRuby::Files::ApiError => e
   puts "Exception when calling FilesApi->update_folder: #{e}"
@@ -1086,6 +1110,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **folder_id** | [**String**](.md)| Folder id for single object | 
  **folder** | [**Folder**](Folder.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1137,6 +1162,8 @@ body = 'body_example' # String |
 name = 'name_example' # String | exact name of the file you are uploading
 filename = 'filename_example' # String | 
 opts = {
+  idempotency_key: 'KEY_VALUE', # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+
   mime_type: 'mime_type_example' # String | 
 }
 
@@ -1158,6 +1185,7 @@ Name | Type | Description  | Notes
  **body** | **String**|  | 
  **name** | **String**| exact name of the file you are uploading | 
  **filename** | **String**|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
  **mime_type** | **String**|  | [optional] 
 
 ### Return type
@@ -1211,6 +1239,8 @@ body = 'body_example' # String |
 name = 'name_example' # String | exact name of the file you are uploading
 filename = 'filename_example' # String | 
 opts = {
+  idempotency_key: 'KEY_VALUE', # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+
   mime_type: 'mime_type_example' # String | 
 }
 
@@ -1233,6 +1263,7 @@ Name | Type | Description  | Notes
  **body** | **String**|  | 
  **name** | **String**| exact name of the file you are uploading | 
  **filename** | **String**|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
  **mime_type** | **String**|  | [optional] 
 
 ### Return type
diff --git a/docs/files/index.html b/docs/files/index.html
index 1ba335d5..44e2e582 100644
--- a/docs/files/index.html
+++ b/docs/files/index.html
@@ -1155,7 +1155,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="Files"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="Files"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="Files"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="Files"><a href="#api-Files">Methods</a></li>
               <li data-group="Files" data-name="createFileAssociation" class="">
                 <a href="#api-Files-createFileAssociation">createFileAssociation</a>
@@ -1256,9 +1256,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 file_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_file_association(xero_tenant_id, file_id, association)
+  response = xero_client.accounting_api.create_file_association(xero_tenant_id, file_id, association, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_file_association: #{e}"
@@ -1336,6 +1337,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createFileAssociation_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1346,7 +1367,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">association </td>
+  <td style="width:150px;">association <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -1357,6 +1378,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1367,7 +1391,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"ObjectId\": \"1270bf7c-5d18-473a-9231-1e36c4bd33ed\", \"ObjectGroup\": \"Contact\", \"ObjectType\": \"Business\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -1400,9 +1425,10 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_folder(xero_tenant_id, folder)
+  response = xero_client.accounting_api.create_folder(xero_tenant_id, folder, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_folder: #{e}"
@@ -1447,6 +1473,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createFolder_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1457,7 +1503,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">folder </td>
+  <td style="width:150px;">folder <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -1468,6 +1514,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1478,7 +1527,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"Name\": \"My Docs\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -1878,9 +1928,13 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 object_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+pagesize = 50
+page = 2
+sort = 'Associations/{ObjectId}?sort=CreatedDateUtc'
+direction = 'Associations/{ObjectId}?sort=CreatedDateUtc&direction=DESC'
 
 begin
-  response = xero_client.accounting_api.get_associations_by_object(xero_tenant_id, object_id)
+  response = xero_client.accounting_api.get_associations_by_object(xero_tenant_id, object_id, pagesize, page, sort, direction)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling get_associations_by_object: #{e}"
@@ -1963,6 +2017,93 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                  </table>
+                  <div class="methodsubtabletitle">Query parameters</div>
+                  <table id="methodsubtable">
+                    <tr>
+                      <th width="150px">Name</th>
+                      <th>Description</th>
+                    </tr>
+                    <tr><td style="width:150px;">pagesize</td>
+<td>
+
+
+    <div id="d2e199_getAssociationsByObject_pagesize">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    Integer
+                </span>
+
+                    <div class="inner description marked">
+pass an optional page size value
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">page</td>
+<td>
+
+
+    <div id="d2e199_getAssociationsByObject_page">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    Integer
+                </span>
+
+                    <div class="inner description marked">
+number of records to skip for pagination
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">sort</td>
+<td>
+
+
+    <div id="d2e199_getAssociationsByObject_sort">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+values to sort by
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
+</tr>
+
+                    <tr><td style="width:150px;">direction</td>
+<td>
+
+
+    <div id="d2e199_getAssociationsByObject_direction">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+direction to sort by
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -2936,9 +3077,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 file_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_file(xero_tenant_id, file_id, fileObject)
+  response = xero_client.accounting_api.update_file(xero_tenant_id, file_id, fileObject, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_file: #{e}"
@@ -3016,6 +3158,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateFile_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3026,7 +3188,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">fileObject </td>
+  <td style="width:150px;">fileObject <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -3037,6 +3199,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -3047,7 +3212,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"FolderId\": \"bf924975-7097-46f2-a143-1ecfbab3c8c3\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -3081,9 +3247,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'YOUR_XERO_TENANT_ID'
 folder_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_folder(xero_tenant_id, folder_id, folder)
+  response = xero_client.accounting_api.update_folder(xero_tenant_id, folder_id, folder, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_folder: #{e}"
@@ -3161,6 +3328,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateFolder_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3232,10 +3419,11 @@ <h3>Usage and SDK Samples</h3>
 body = BYTE_ARRAY_DATA_HERE
 name = 'name_example'
 filename = 'filename_example'
+idempotency_key = 'KEY_VALUE'
 mimeType = 'mimeType_example'
 
 begin
-  response = xero_client.accounting_api.upload_file(xero_tenant_id, body, name, filename, mimeType)
+  response = xero_client.accounting_api.upload_file(xero_tenant_id, body, name, filename, idempotency_key, mimeType)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling upload_file: #{e}"
@@ -3280,6 +3468,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_uploadFile_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3415,10 +3623,11 @@ <h3>Usage and SDK Samples</h3>
 body = BYTE_ARRAY_DATA_HERE
 name = 'name_example'
 filename = 'filename_example'
+idempotency_key = 'KEY_VALUE'
 mimeType = 'mimeType_example'
 
 begin
-  response = xero_client.accounting_api.upload_file_to_folder(xero_tenant_id, folder_id, body, name, filename, mimeType)
+  response = xero_client.accounting_api.upload_file_to_folder(xero_tenant_id, folder_id, body, name, filename, idempotency_key, mimeType)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling upload_file_to_folder: #{e}"
@@ -3496,6 +3705,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_uploadFileToFolder_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/docs/finance/index.html b/docs/finance/index.html
index 8581cb01..51612e82 100644
--- a/docs/finance/index.html
+++ b/docs/finance/index.html
@@ -2052,7 +2052,7 @@
   "title" : "",
   "type" : "string",
   "description" : "",
-  "enum" : [ "NotSet", "bank-account-not-found", "internal-error", "invalid-application", "invalid-request", "organisation-not-found", "organisation-offline", "request-timeout", "service-unavailable", "unauthorized" ]
+  "enum" : [ "NotSet", "bank-account-not-found", "internal-error", "invalid-application", "invalid-request", "organisation-not-found", "organisation-offline", "request-timeout", "service-unavailable", "unauthorized", "rate-limit-error" ]
 };
       defs["ProfitAndLossResponse"] = {
   "title" : "",
@@ -2734,7 +2734,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="Finance"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="Finance"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="Finance"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="Finance"><a href="#api-Finance">Methods</a></li>
               <li data-group="Finance" data-name="getAccountingActivityAccountUsage" class="">
                 <a href="#api-Finance-getAccountingActivityAccountUsage">getAccountingActivityAccountUsage</a>
diff --git a/docs/payroll_au/PayrollAuApi.md b/docs/payroll_au/PayrollAuApi.md
index ba2d2ba8..4f346aad 100644
--- a/docs/payroll_au/PayrollAuApi.md
+++ b/docs/payroll_au/PayrollAuApi.md
@@ -41,7 +41,7 @@ Method | HTTP request | Description
 
 ## approve_leave_application
 
-> LeaveApplications approve_leave_application(xero_tenant_id, leave_application_id)
+> LeaveApplications approve_leave_application(xero_tenant_id, leave_application_id, opts)
 
 Approve a requested leave application by a unique leave application id
 
@@ -72,9 +72,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Leave Application id for single object
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Approve a requested leave application by a unique leave application id
-  result = api_instance.approve_leave_application(xero_tenant_id, leave_application_id)
+  result = api_instance.approve_leave_application(xero_tenant_id, leave_application_id, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->approve_leave_application: #{e}"
@@ -88,6 +92,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_application_id** | [**String**](.md)| Leave Application id for single object | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -105,7 +110,7 @@ Name | Type | Description  | Notes
 
 ## create_employee
 
-> Employees create_employee(xero_tenant_id, employee)
+> Employees create_employee(xero_tenant_id, employee, opts)
 
 Creates a payroll employee
 
@@ -136,9 +141,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee = [ { "FirstName": "Albus", "LastName": "Dumbledore", "DateOfBirth": "/Date(321523200000+0000)/", "HomeAddress": { "AddressLine1": "101 Green St", "City": "Island Bay", "Region": "NSW", "PostalCode": "6023", "Country": "AUSTRALIA" }, "StartDate": "/Date(321523200000+0000)/", "MiddleNames": "Percival", "Email": "albus39608@hogwarts.edu", "Gender": "M", "Phone": "444-2323", "Mobile": "555-1212", "IsAuthorisedToApproveLeave": true, "IsAuthorisedToApproveTimesheets": true, "JobTitle": "Regional Manager", "Classification": "corporate", "OrdinaryEarningsRateID": "ab874dfb-ab09-4c91-954e-43acf6fc23b4", "Status": "ACTIVE" } ] # Array<Employee> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a payroll employee
-  result = api_instance.create_employee(xero_tenant_id, employee)
+  result = api_instance.create_employee(xero_tenant_id, employee, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_employee: #{e}"
@@ -152,6 +161,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee** | [**Array&lt;Employee&gt;**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -169,7 +179,7 @@ Name | Type | Description  | Notes
 
 ## create_leave_application
 
-> LeaveApplications create_leave_application(xero_tenant_id, leave_application)
+> LeaveApplications create_leave_application(xero_tenant_id, leave_application, opts)
 
 Creates a leave application
 
@@ -200,9 +210,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_application = [ { "EmployeeID": "cdfb8371-0b21-4b8a-8903-1024df6c391e", "LeaveTypeID": "184ea8f7-d143-46dd-bef3-0c60e1aa6fca", "Title": "Hello World", "StartDate": "/Date(1572559200000+0000)/", "EndDate": "/Date(1572645600000+0000)/" } ] # Array<LeaveApplication> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a leave application
-  result = api_instance.create_leave_application(xero_tenant_id, leave_application)
+  result = api_instance.create_leave_application(xero_tenant_id, leave_application, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_leave_application: #{e}"
@@ -216,6 +230,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_application** | [**Array&lt;LeaveApplication&gt;**](LeaveApplication.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -233,7 +248,7 @@ Name | Type | Description  | Notes
 
 ## create_pay_item
 
-> PayItems create_pay_item(xero_tenant_id, pay_item)
+> PayItems create_pay_item(xero_tenant_id, pay_item, opts)
 
 Creates a pay item
 
@@ -264,9 +279,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_item = { "EarningsRates": [ { "Name": "MyRate", "AccountCode": "400", "TypeOfUnits": "4.00", "IsExemptFromTax": true, "IsExemptFromSuper": true, "IsReportableAsW1": false, "AllowanceContributesToAnnualLeaveRate": false, "AllowanceContributesToOvertimeRate": false, "EarningsType": "ORDINARYTIMEEARNINGS", "EarningsRateID": "1fa4e226-b711-46ba-a8a7-4344c9c5fb87", "RateType": "MULTIPLE", "RatePerUnit": "10.0", "Multiplier": 1.5, "Amount": 5, "EmploymentTerminationPaymentType": "O" } ] } # PayItem | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a pay item
-  result = api_instance.create_pay_item(xero_tenant_id, pay_item)
+  result = api_instance.create_pay_item(xero_tenant_id, pay_item, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_pay_item: #{e}"
@@ -280,6 +299,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_item** | [**PayItem**](PayItem.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -297,7 +317,7 @@ Name | Type | Description  | Notes
 
 ## create_pay_run
 
-> PayRuns create_pay_run(xero_tenant_id, pay_run)
+> PayRuns create_pay_run(xero_tenant_id, pay_run, opts)
 
 Creates a pay run
 
@@ -328,9 +348,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run = [ { "PayrollCalendarID": "78bb86b9-e1ea-47ac-b75d-f087a81931de", "PayRunPeriodStartDate": "/Date(1572566400000+0000)/", "PayRunPeriodEndDate": "/Date(1573084800000+0000)/", "PayRunStatus": "DRAFT", "PaymentDate": "/Date(1573171200000+0000)/" } ] # Array<PayRun> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a pay run
-  result = api_instance.create_pay_run(xero_tenant_id, pay_run)
+  result = api_instance.create_pay_run(xero_tenant_id, pay_run, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_pay_run: #{e}"
@@ -344,6 +368,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run** | [**Array&lt;PayRun&gt;**](PayRun.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -361,7 +386,7 @@ Name | Type | Description  | Notes
 
 ## create_payroll_calendar
 
-> PayrollCalendars create_payroll_calendar(xero_tenant_id, payroll_calendar)
+> PayrollCalendars create_payroll_calendar(xero_tenant_id, payroll_calendar, opts)
 
 Creates a Payroll Calendar
 
@@ -392,9 +417,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 payroll_calendar = [ { "PayrollCalendarID":"78bb86b9-e1ea-47ac-b75d-f087a81931de", "PayRunPeriodStartDate":"/Date(1572566400000+0000)/", "PayRunPeriodEndDate":"/Date(1573084800000+0000)/", "PayRunStatus":"DRAFT", "PaymentDate":"/Date(1573171200000+0000)/" } ] # Array<PayrollCalendar> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a Payroll Calendar
-  result = api_instance.create_payroll_calendar(xero_tenant_id, payroll_calendar)
+  result = api_instance.create_payroll_calendar(xero_tenant_id, payroll_calendar, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_payroll_calendar: #{e}"
@@ -408,6 +437,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payroll_calendar** | [**Array&lt;PayrollCalendar&gt;**](PayrollCalendar.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -425,7 +455,7 @@ Name | Type | Description  | Notes
 
 ## create_superfund
 
-> SuperFunds create_superfund(xero_tenant_id, super_fund)
+> SuperFunds create_superfund(xero_tenant_id, super_fund, opts)
 
 Creates a superfund
 
@@ -456,9 +486,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 super_fund = [ { "usi":"PTC0133AU", "Type":"REGULATED", "Name":"Bar99359", "AccountNumber":"FB36350", "AccountName":"Foo38428", "USI":"PTC0133AU" } ] # Array<SuperFund> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a superfund
-  result = api_instance.create_superfund(xero_tenant_id, super_fund)
+  result = api_instance.create_superfund(xero_tenant_id, super_fund, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_superfund: #{e}"
@@ -472,6 +506,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **super_fund** | [**Array&lt;SuperFund&gt;**](SuperFund.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -489,7 +524,7 @@ Name | Type | Description  | Notes
 
 ## create_timesheet
 
-> Timesheets create_timesheet(xero_tenant_id, timesheet)
+> Timesheets create_timesheet(xero_tenant_id, timesheet, opts)
 
 Creates a timesheet
 
@@ -520,9 +555,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet = [ { "EmployeeID":"b34e89ff-770d-4099-b7e5-f968767118bc", "StartDate":"/Date(1573171200000+0000)/", "EndDate":"/Date(1573689600000+0000)/", "Status":"DRAFT", "TimesheetLines":[ { "EarningsRateID":"ab874dfb-ab09-4c91-954e-43acf6fc23b4", "TrackingItemID":"af5e9ce2-2349-4136-be99-3561b189f473", "NumberOfUnits":[ 2.0, 10.0, 0.0, 0.0, 5.0, 0.0, 5.0 ] } ] } ] # Array<Timesheet> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a timesheet
-  result = api_instance.create_timesheet(xero_tenant_id, timesheet)
+  result = api_instance.create_timesheet(xero_tenant_id, timesheet, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->create_timesheet: #{e}"
@@ -536,6 +575,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet** | [**Array&lt;Timesheet&gt;**](Timesheet.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1741,7 +1781,7 @@ Name | Type | Description  | Notes
 
 ## reject_leave_application
 
-> LeaveApplications reject_leave_application(xero_tenant_id, leave_application_id)
+> LeaveApplications reject_leave_application(xero_tenant_id, leave_application_id, opts)
 
 Reject a leave application by a unique leave application id
 
@@ -1772,9 +1812,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Leave Application id for single object
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Reject a leave application by a unique leave application id
-  result = api_instance.reject_leave_application(xero_tenant_id, leave_application_id)
+  result = api_instance.reject_leave_application(xero_tenant_id, leave_application_id, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->reject_leave_application: #{e}"
@@ -1788,6 +1832,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_application_id** | [**String**](.md)| Leave Application id for single object | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1805,7 +1850,7 @@ Name | Type | Description  | Notes
 
 ## update_employee
 
-> Employees update_employee(xero_tenant_id, employee_id, opts)
+> Employees update_employee(xero_tenant_id, employee_id, employee, opts)
 
 Updates an employee's detail
 
@@ -1838,13 +1883,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
+employee = [ { "MiddleNames": "Frank" } ] # Array<Employee> | 
 opts = {
-  employee: [ { "MiddleNames": "Frank" } ] # Array<Employee> | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Updates an employee's detail
-  result = api_instance.update_employee(xero_tenant_id, employee_id, opts)
+  result = api_instance.update_employee(xero_tenant_id, employee_id, employee, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_employee: #{e}"
@@ -1858,7 +1904,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
- **employee** | [**Array&lt;Employee&gt;**](Employee.md)|  | [optional] 
+ **employee** | [**Array&lt;Employee&gt;**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1876,7 +1923,7 @@ Name | Type | Description  | Notes
 
 ## update_leave_application
 
-> LeaveApplications update_leave_application(xero_tenant_id, leave_application_id, leave_application)
+> LeaveApplications update_leave_application(xero_tenant_id, leave_application_id, leave_application, opts)
 
 Updates a specific leave application
 
@@ -1908,9 +1955,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Leave Application id for single object
 leave_application = [ { "EmployeeID": "cdfb8371-0b21-4b8a-8903-1024df6c391e", "LeaveApplicationID": "1d4cd583-0107-4386-936b-672eb3d1f624", "LeaveTypeID": "184ea8f7-d143-46dd-bef3-0c60e1aa6fca", "LeavePeriods": [ { "PayPeriodStartDate": "/Date(1572566400000+0000)/", "PayPeriodEndDate": "/Date(1573084800000+0000)/", "LeavePeriodStatus": "SCHEDULED", "NumberOfUnits": 7.6 } ], "Title": "vacation", "Description": "My updated Description", "StartDate": "/Date(1572559200000+0000)/", "EndDate": "/Date(1572645600000+0000)/", "PayOutType": "DEFAULT" } ] # Array<LeaveApplication> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific leave application
-  result = api_instance.update_leave_application(xero_tenant_id, leave_application_id, leave_application)
+  result = api_instance.update_leave_application(xero_tenant_id, leave_application_id, leave_application, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_leave_application: #{e}"
@@ -1925,6 +1976,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_application_id** | [**String**](.md)| Leave Application id for single object | 
  **leave_application** | [**Array&lt;LeaveApplication&gt;**](LeaveApplication.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1942,7 +1994,7 @@ Name | Type | Description  | Notes
 
 ## update_pay_run
 
-> PayRuns update_pay_run(xero_tenant_id, pay_run_id, opts)
+> PayRuns update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
 
 Updates a pay run
 
@@ -1975,13 +2027,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | PayRun id for single object
+pay_run = [XeroRuby::PayrollAu::PayRun.new] # Array<PayRun> | 
 opts = {
-  pay_run: [XeroRuby::PayrollAu::PayRun.new] # Array<PayRun> | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Updates a pay run
-  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, opts)
+  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_pay_run: #{e}"
@@ -1995,7 +2048,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run_id** | [**String**](.md)| PayRun id for single object | 
- **pay_run** | [**Array&lt;PayRun&gt;**](PayRun.md)|  | [optional] 
+ **pay_run** | [**Array&lt;PayRun&gt;**](PayRun.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2013,7 +2067,7 @@ Name | Type | Description  | Notes
 
 ## update_payslip
 
-> Payslips update_payslip(xero_tenant_id, payslip_id, opts)
+> Payslips update_payslip(xero_tenant_id, payslip_id, payslip_lines, opts)
 
 Updates a payslip
 
@@ -2046,13 +2100,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 payslip_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Payslip id for single object
+payslip_lines = { "Payslip": { "EmployeeID": "cdfb8371-0b21-4b8a-8903-1024df6c391e", "DeductionLines": [ { "DeductionTypeID": "727af5e8-b347-4ae7-85fc-9b82266d0aec", "CalculationType": "FIXEDAMOUNT", "NumberOfUnits": 10 } ] } } # Array<PayslipLines> | 
 opts = {
-  payslip_lines: { "Payslip": { "EmployeeID": "cdfb8371-0b21-4b8a-8903-1024df6c391e", "DeductionLines": [ { "DeductionTypeID": "727af5e8-b347-4ae7-85fc-9b82266d0aec", "CalculationType": "FIXEDAMOUNT", "NumberOfUnits": 10 } ] } } # Array<PayslipLines> | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Updates a payslip
-  result = api_instance.update_payslip(xero_tenant_id, payslip_id, opts)
+  result = api_instance.update_payslip(xero_tenant_id, payslip_id, payslip_lines, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_payslip: #{e}"
@@ -2066,7 +2121,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **payslip_id** | [**String**](.md)| Payslip id for single object | 
- **payslip_lines** | [**Array&lt;PayslipLines&gt;**](PayslipLines.md)|  | [optional] 
+ **payslip_lines** | [**Array&lt;PayslipLines&gt;**](PayslipLines.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2084,7 +2140,7 @@ Name | Type | Description  | Notes
 
 ## update_superfund
 
-> SuperFunds update_superfund(xero_tenant_id, super_fund_id, opts)
+> SuperFunds update_superfund(xero_tenant_id, super_fund_id, super_fund, opts)
 
 Updates a superfund
 
@@ -2117,13 +2173,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 super_fund_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Superfund id for single object
+super_fund =  [ { "Type":"REGULATED", "Name":"Nice23534" } ] # Array<SuperFund> | 
 opts = {
-  super_fund:  [ { "Type":"REGULATED", "Name":"Nice23534" } ] # Array<SuperFund> | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Updates a superfund
-  result = api_instance.update_superfund(xero_tenant_id, super_fund_id, opts)
+  result = api_instance.update_superfund(xero_tenant_id, super_fund_id, super_fund, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_superfund: #{e}"
@@ -2137,7 +2194,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **super_fund_id** | [**String**](.md)| Superfund id for single object | 
- **super_fund** | [**Array&lt;SuperFund&gt;**](SuperFund.md)|  | [optional] 
+ **super_fund** | [**Array&lt;SuperFund&gt;**](SuperFund.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -2155,7 +2213,7 @@ Name | Type | Description  | Notes
 
 ## update_timesheet
 
-> Timesheets update_timesheet(xero_tenant_id, timesheet_id, opts)
+> Timesheets update_timesheet(xero_tenant_id, timesheet_id, timesheet, opts)
 
 Updates a timesheet
 
@@ -2188,13 +2246,14 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Timesheet id for single object
+timesheet = [ { "EmployeeID":"b34e89ff-770d-4099-b7e5-f968767118bc", "StartDate":"/Date(1573171200000+0000)/", "EndDate":"/Date(1573689600000+0000)/", "Status":"APPROVED", "Hours":22.0, "TimesheetID":"a7eb0a79-8511-4ee7-b473-3a25f28abcb9", "TimesheetLines":[ { "EarningsRateID":"ab874dfb-ab09-4c91-954e-43acf6fc23b4", "TrackingItemID":"af5e9ce2-2349-4136-be99-3561b189f473", "NumberOfUnits":[ 2.0, 10.0, 0.0, 0.0, 5.0, 0.0, 5.0 ], "UpdatedDateUTC":"/Date(1573516185127+0000)/" } ] } ] # Array<Timesheet> | 
 opts = {
-  timesheet: [ { "EmployeeID":"b34e89ff-770d-4099-b7e5-f968767118bc", "StartDate":"/Date(1573171200000+0000)/", "EndDate":"/Date(1573689600000+0000)/", "Status":"APPROVED", "Hours":22.0, "TimesheetID":"a7eb0a79-8511-4ee7-b473-3a25f28abcb9", "TimesheetLines":[ { "EarningsRateID":"ab874dfb-ab09-4c91-954e-43acf6fc23b4", "TrackingItemID":"af5e9ce2-2349-4136-be99-3561b189f473", "NumberOfUnits":[ 2.0, 10.0, 0.0, 0.0, 5.0, 0.0, 5.0 ], "UpdatedDateUTC":"/Date(1573516185127+0000)/" } ] } ] # Array<Timesheet> | 
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
 }
 
 begin
   #Updates a timesheet
-  result = api_instance.update_timesheet(xero_tenant_id, timesheet_id, opts)
+  result = api_instance.update_timesheet(xero_tenant_id, timesheet_id, timesheet, opts)
   p result
 rescue XeroRuby::PayrollAu::ApiError => e
   puts "Exception when calling PayrollAuApi->update_timesheet: #{e}"
@@ -2208,7 +2267,8 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Timesheet id for single object | 
- **timesheet** | [**Array&lt;Timesheet&gt;**](Timesheet.md)|  | [optional] 
+ **timesheet** | [**Array&lt;Timesheet&gt;**](Timesheet.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/payroll_au/index.html b/docs/payroll_au/index.html
index 9f93efb1..bb130441 100644
--- a/docs/payroll_au/index.html
+++ b/docs/payroll_au/index.html
@@ -977,9 +977,9 @@
       defs["CountryOfResidence"] = {
   "title" : "",
   "type" : "string",
-  "description" : "Country of residence as a valid ISO 3166-1 alpha-2 country code e.g. &quot;AU&quot;, &quot;NZ&quot;, &quot;CA&quot; or an empty string (&quot;&quot;) to unset a previously set value. Only applicable, and mandatory if income type is WORKINGHOLIDAYMAKER.",
+  "description" : "Country of residence as a valid ISO 3166-1 alpha-2 country code e.g. &quot;AU&quot;, &quot;NZ&quot;, &quot;CA&quot;. Only applicable, and mandatory if income type is WORKINGHOLIDAYMAKER.",
   "example" : "AU",
-  "enum" : [ "AF", "AX", "AL", "DZ", "AS", "AD", "AO", "AI", "AQ", "AG", "AR", "AM", "AW", "AU", "AT", "AZ", "BS", "BH", "BD", "BB", "BY", "BE", "BZ", "BJ", "BM", "BT", "BO", "BA", "BW", "BV", "BR", "IO", "BN", "BG", "BF", "BI", "KH", "CM", "CA", "CV", "KY", "CF", "TD", "CL", "CN", "CX", "CC", "CO", "KM", "CG", "CD", "CK", "CR", "CI", "HR", "CU", "CY", "CZ", "DK", "DJ", "DM", "DO", "EC", "EG", "SV", "GQ", "ER", "EE", "ET", "FK", "FO", "FJ", "FI", "FR", "GF", "PF", "TF", "GA", "GM", "GE", "DE", "GH", "GI", "GR", "GL", "GD", "GP", "GU", "GT", "GG", "GN", "GW", "GY", "HT", "HM", "VA", "HN", "HK", "HU", "IS", "IN", "ID", "IR", "IQ", "IE", "IM", "IL", "IT", "JM", "JP", "JE", "JO", "KZ", "KE", "KI", "KP", "KR", "KW", "KG", "LA", "LV", "LB", "LS", "LR", "LY", "LI", "LT", "LU", "MO", "MK", "MG", "MW", "MY", "MV", "ML", "MT", "MH", "MQ", "MR", "MU", "YT", "MX", "FM", "MD", "MC", "MN", "ME", "MS", "MA", "MZ", "MM", "NA", "NR", "NP", "NL", "AN", "NC", "NZ", "NI", "NE", "NG", "NU", "NF", "MP", "NO", "OM", "PK", "PW", "PS", "PA", "PG", "PY", "PE", "PH", "PN", "PL", "PT", "PR", "QA", "RE", "RO", "RU", "RW", "BL", "SH", "KN", "LC", "MF", "PM", "VC", "WS", "SM", "ST", "SA", "SN", "RS", "SC", "SL", "SG", "SK", "SI", "SB", "SO", "ZA", "GS", "ES", "LK", "SD", "SR", "SJ", "SZ", "SE", "CH", "SY", "TW", "TJ", "TZ", "TH", "TL", "TG", "TK", "TO", "TT", "TN", "TR", "TM", "TC", "TV", "UG", "UA", "AE", "GB", "US", "UM", "UY", "UZ", "VU", "VE", "VN", "VG", "VI", "WF", "EH", "YE", "ZM", "ZW", "BQ", "CW", "SX", "SS", "" ]
+  "enum" : [ "AF", "AX", "AL", "DZ", "AS", "AD", "AO", "AI", "AQ", "AG", "AR", "AM", "AW", "AU", "AT", "AZ", "BS", "BH", "BD", "BB", "BY", "BE", "BZ", "BJ", "BM", "BT", "BO", "BA", "BW", "BV", "BR", "IO", "BN", "BG", "BF", "BI", "KH", "CM", "CA", "CV", "KY", "CF", "TD", "CL", "CN", "CX", "CC", "CO", "KM", "CG", "CD", "CK", "CR", "CI", "HR", "CU", "CY", "CZ", "DK", "DJ", "DM", "DO", "EC", "EG", "SV", "GQ", "ER", "EE", "ET", "FK", "FO", "FJ", "FI", "FR", "GF", "PF", "TF", "GA", "GM", "GE", "DE", "GH", "GI", "GR", "GL", "GD", "GP", "GU", "GT", "GG", "GN", "GW", "GY", "HT", "HM", "VA", "HN", "HK", "HU", "IS", "IN", "ID", "IR", "IQ", "IE", "IM", "IL", "IT", "JM", "JP", "JE", "JO", "KZ", "KE", "KI", "KP", "KR", "KW", "KG", "LA", "LV", "LB", "LS", "LR", "LY", "LI", "LT", "LU", "MO", "MK", "MG", "MW", "MY", "MV", "ML", "MT", "MH", "MQ", "MR", "MU", "YT", "MX", "FM", "MD", "MC", "MN", "ME", "MS", "MA", "MZ", "MM", "NA", "NR", "NP", "NL", "AN", "NC", "NZ", "NI", "NE", "NG", "NU", "NF", "MP", "NO", "OM", "PK", "PW", "PS", "PA", "PG", "PY", "PE", "PH", "PN", "PL", "PT", "PR", "QA", "RE", "RO", "RU", "RW", "BL", "SH", "KN", "LC", "MF", "PM", "VC", "WS", "SM", "ST", "SA", "SN", "RS", "SC", "SL", "SG", "SK", "SI", "SB", "SO", "ZA", "GS", "ES", "LK", "SD", "SR", "SJ", "SZ", "SE", "CH", "SY", "TW", "TJ", "TZ", "TH", "TL", "TG", "TK", "TO", "TT", "TN", "TR", "TM", "TC", "TV", "UG", "UA", "AE", "GB", "US", "UM", "UY", "UZ", "VU", "VE", "VN", "VG", "VI", "WF", "EH", "YE", "ZM", "ZW", "BQ", "CW", "SX", "SS" ]
 };
       defs["DeductionLine"] = {
   "title" : "",
@@ -1764,7 +1764,7 @@
   "title" : "",
   "type" : "string",
   "description" : "Calculation type for leave line for Opening Balance on Employee",
-  "enum" : [ "NOCALCULATIONREQUIRED", "FIXEDAMOUNTEACHPERIOD", "ENTERRATEINPAYTEMPLATE", "BASEDONORDINARYEARNINGS", "" ]
+  "enum" : [ "NOCALCULATIONREQUIRED", "FIXEDAMOUNTEACHPERIOD", "ENTERRATEINPAYTEMPLATE", "BASEDONORDINARYEARNINGS" ]
 };
       defs["LeaveLines"] = {
   "title" : "",
@@ -1813,7 +1813,7 @@
   "title" : "",
   "type" : "string",
   "description" : "",
-  "enum" : [ "SCHEDULED", "PROCESSED" ]
+  "enum" : [ "SCHEDULED", "PROCESSED", "REQUESTED", "REJECTED" ]
 };
       defs["LeaveType"] = {
   "title" : "",
@@ -3412,7 +3412,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="PayrollAu"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="PayrollAu"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="PayrollAu"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="PayrollAu"><a href="#api-PayrollAu">Methods</a></li>
               <li data-group="PayrollAu" data-name="approveLeaveApplication" class="">
                 <a href="#api-PayrollAu-approveLeaveApplication">approveLeaveApplication</a>
@@ -3555,9 +3555,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.approve_leave_application(xero_tenant_id, leave_application_id)
+  response = xero_client.accounting_api.approve_leave_application(xero_tenant_id, leave_application_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling approve_leave_application: #{e}"
@@ -3635,6 +3636,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_approveLeaveApplication_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3667,6 +3688,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 home_address = { 
@@ -3684,7 +3706,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee)
+  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee: #{e}"
@@ -3729,6 +3751,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3800,6 +3842,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -3812,7 +3855,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_leave_application(xero_tenant_id, leaveApplication)
+  response = xero_client.accounting_api.create_leave_application(xero_tenant_id, leaveApplication, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_leave_application: #{e}"
@@ -3857,6 +3900,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createLeaveApplication_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3928,6 +3991,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 earnings_rate = { 
   name: "Ordinary Hours 123",
@@ -3972,7 +4036,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_pay_item(xero_tenant_id, payItem)
+  response = xero_client.accounting_api.create_pay_item(xero_tenant_id, payItem, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_pay_item: #{e}"
@@ -4017,6 +4081,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayItem_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4085,13 +4169,14 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 pay_run = { 
   payroll_calendar_id: "00000000-0000-0000-0000-000000000000"
 }  
 
 begin
-  response = xero_client.accounting_api.create_pay_run(xero_tenant_id, payRun)
+  response = xero_client.accounting_api.create_pay_run(xero_tenant_id, payRun, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_pay_run: #{e}"
@@ -4136,6 +4221,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayRun_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4207,6 +4312,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 payment_date = 'YYYY-MM-DD'
 
@@ -4220,7 +4326,7 @@ <h3>Usage and SDK Samples</h3>
 payroll_calendars << payroll_calendar
 
 begin
-  response = xero_client.accounting_api.create_payroll_calendar(xero_tenant_id, payrollCalendar)
+  response = xero_client.accounting_api.create_payroll_calendar(xero_tenant_id, payrollCalendar, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_payroll_calendar: #{e}"
@@ -4265,6 +4371,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayrollCalendar_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4336,6 +4462,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 super_fund = { 
   type:  XeroRuby::PayrollAu::SuperFundType::REGULATED,
@@ -4343,7 +4470,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_superfund(xero_tenant_id, superFund)
+  response = xero_client.accounting_api.create_superfund(xero_tenant_id, superFund, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_superfund: #{e}"
@@ -4388,6 +4515,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createSuperfund_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4459,6 +4606,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -4470,7 +4618,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet)
+  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_timesheet: #{e}"
@@ -4515,6 +4663,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7054,9 +7222,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.reject_leave_application(xero_tenant_id, leave_application_id)
+  response = xero_client.accounting_api.reject_leave_application(xero_tenant_id, leave_application_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling reject_leave_application: #{e}"
@@ -7134,6 +7303,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_rejectLeaveApplication_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7167,6 +7356,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 home_address = { 
@@ -7184,7 +7374,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee)
+  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee: #{e}"
@@ -7262,6 +7452,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7272,7 +7482,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">employee </td>
+  <td style="width:150px;">employee <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -7283,6 +7493,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -7296,7 +7509,8 @@ <h2>Parameters</h2>
       },
       "example" : "[ { \"MiddleNames\": \"Frank\" } ]"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -7330,6 +7544,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 leave_application_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -7342,7 +7557,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_leave_application(xero_tenant_id, leave_application_id, leaveApplication)
+  response = xero_client.accounting_api.update_leave_application(xero_tenant_id, leave_application_id, leaveApplication, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_leave_application: #{e}"
@@ -7420,6 +7635,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateLeaveApplication_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7492,13 +7727,14 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 pay_run_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 pay_run = { 
   payroll_calendar_id: "00000000-0000-0000-0000-000000000000"
 }  
 
 begin
-  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun)
+  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_pay_run: #{e}"
@@ -7576,6 +7812,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePayRun_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7586,7 +7842,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">payRun </td>
+  <td style="width:150px;">payRun <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -7597,6 +7853,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -7610,7 +7869,8 @@ <h2>Parameters</h2>
         }
       }
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -7644,6 +7904,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 payslip_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 earnings_line = { 
   earnings_rate_id: "00000000-0000-0000-0000-000000000000",
@@ -7660,7 +7921,7 @@ <h3>Usage and SDK Samples</h3>
 payslip_lines << payslip_line
 
 begin
-  response = xero_client.accounting_api.update_payslip(xero_tenant_id, payslip_id, payslipLines)
+  response = xero_client.accounting_api.update_payslip(xero_tenant_id, payslip_id, payslipLines, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_payslip: #{e}"
@@ -7738,6 +7999,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePayslip_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7748,7 +8029,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">payslipLines </td>
+  <td style="width:150px;">payslipLines <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -7759,6 +8040,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -7772,7 +8056,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"Payslip\": { \"EmployeeID\": \"cdfb8371-0b21-4b8a-8903-1024df6c391e\", \"DeductionLines\": [ { \"DeductionTypeID\": \"727af5e8-b347-4ae7-85fc-9b82266d0aec\", \"CalculationType\": \"FIXEDAMOUNT\", \"NumberOfUnits\": 10 } ] } }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -7806,6 +8091,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 super_fund_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 super_fund = { 
   type:  XeroRuby::PayrollAu::SuperFundType::REGULATED,
@@ -7813,7 +8099,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_superfund(xero_tenant_id, super_fund_id, superFund)
+  response = xero_client.accounting_api.update_superfund(xero_tenant_id, super_fund_id, superFund, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_superfund: #{e}"
@@ -7891,6 +8177,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateSuperfund_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -7901,7 +8207,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">superFund </td>
+  <td style="width:150px;">superFund <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -7912,6 +8218,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -7925,7 +8234,8 @@ <h2>Parameters</h2>
       },
       "example" : " [ { \"Type\":\"REGULATED\", \"Name\":\"Nice23534\" } ]"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -7959,6 +8269,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -7970,7 +8281,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_timesheet(xero_tenant_id, timesheet_id, timesheet)
+  response = xero_client.accounting_api.update_timesheet(xero_tenant_id, timesheet_id, timesheet, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_timesheet: #{e}"
@@ -8048,6 +8359,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -8058,7 +8389,7 @@ <h2>Parameters</h2>
                       <th>Description</th>
                     </tr>
                     <tr>
-  <td style="width:150px;">timesheet </td>
+  <td style="width:150px;">timesheet <span style="color:red;">*</span></td>
   <td>
     <div class="json-schema-view">
       <div class="primitive">
@@ -8069,6 +8400,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -8082,7 +8416,8 @@ <h2>Parameters</h2>
       },
       "example" : "[ { \"EmployeeID\":\"b34e89ff-770d-4099-b7e5-f968767118bc\", \"StartDate\":\"/Date(1573171200000+0000)/\", \"EndDate\":\"/Date(1573689600000+0000)/\", \"Status\":\"APPROVED\", \"Hours\":22.0, \"TimesheetID\":\"a7eb0a79-8511-4ee7-b473-3a25f28abcb9\", \"TimesheetLines\":[ { \"EarningsRateID\":\"ab874dfb-ab09-4c91-954e-43acf6fc23b4\", \"TrackingItemID\":\"af5e9ce2-2349-4136-be99-3561b189f473\", \"NumberOfUnits\":[ 2.0, 10.0, 0.0, 0.0, 5.0, 0.0, 5.0 ], \"UpdatedDateUTC\":\"/Date(1573516185127+0000)/\" } ] } ]"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
diff --git a/docs/payroll_nz/Employee.md b/docs/payroll_nz/Employee.md
index c25100ce..73eaabce 100644
--- a/docs/payroll_nz/Employee.md
+++ b/docs/payroll_nz/Employee.md
@@ -18,6 +18,7 @@ Name | Type | Description | Notes
 **payroll_calendar_id** | **String** | Xero unique identifier for the payroll calendar of the employee | [optional] 
 **updated_date_utc** | **DateTime** | UTC timestamp of last update to the employee | [optional] 
 **created_date_utc** | **DateTime** | UTC timestamp when the employee was created in Xero | [optional] 
+**job_title** | **String** | Employee&#39;s job title | [optional] 
 
 ## Code Sample
 
@@ -37,7 +38,8 @@ instance = XeroRuby::PayrollNz::Employee.new(employee_id: d90457c4-f1be-4f2e-b4e
                                  end_date: Sun Jan 19 00:00:00 GMT 2020,
                                  payroll_calendar_id: null,
                                  updated_date_utc: null,
-                                 created_date_utc: null)
+                                 created_date_utc: null,
+                                 job_title: General Manager)
 ```
 
 
diff --git a/docs/payroll_nz/PayrollNzApi.md b/docs/payroll_nz/PayrollNzApi.md
index cf4be8f2..c22da977 100644
--- a/docs/payroll_nz/PayrollNzApi.md
+++ b/docs/payroll_nz/PayrollNzApi.md
@@ -77,7 +77,7 @@ Method | HTTP request | Description
 
 ## approve_timesheet
 
-> TimesheetObject approve_timesheet(xero_tenant_id, timesheet_id)
+> TimesheetObject approve_timesheet(xero_tenant_id, timesheet_id, opts)
 
 Approves a timesheet
 
@@ -108,9 +108,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Approves a timesheet
-  result = api_instance.approve_timesheet(xero_tenant_id, timesheet_id)
+  result = api_instance.approve_timesheet(xero_tenant_id, timesheet_id, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->approve_timesheet: #{e}"
@@ -124,6 +128,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -141,7 +146,7 @@ Name | Type | Description  | Notes
 
 ## create_deduction
 
-> DeductionObject create_deduction(xero_tenant_id, deduction)
+> DeductionObject create_deduction(xero_tenant_id, deduction, opts)
 
 Creates a new deduction for a specific employee
 
@@ -172,9 +177,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 deduction = { "deductionName": "My new deduction", "deductionCategory": "NzOther", "liabilityAccountId": "568f2e9a-0870-46cc-8678-f83f132ed4e3" } # Deduction | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new deduction for a specific employee
-  result = api_instance.create_deduction(xero_tenant_id, deduction)
+  result = api_instance.create_deduction(xero_tenant_id, deduction, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_deduction: #{e}"
@@ -188,6 +197,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **deduction** | [**Deduction**](Deduction.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -205,7 +215,7 @@ Name | Type | Description  | Notes
 
 ## create_earnings_rate
 
-> EarningsRateObject create_earnings_rate(xero_tenant_id, earnings_rate)
+> EarningsRateObject create_earnings_rate(xero_tenant_id, earnings_rate, opts)
 
 Creates a new earnings rate
 
@@ -236,9 +246,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 earnings_rate = { "name": "My Earnings Rate", "earningsType": "RegularEarnings", "rateType": "RatePerUnit", "typeOfUnits": "hours", "expenseAccountID": "e4eb36f6-97e3-4427-a394-dd4e1b355c2e" } # EarningsRate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new earnings rate
-  result = api_instance.create_earnings_rate(xero_tenant_id, earnings_rate)
+  result = api_instance.create_earnings_rate(xero_tenant_id, earnings_rate, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_earnings_rate: #{e}"
@@ -252,6 +266,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **earnings_rate** | [**EarningsRate**](EarningsRate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -269,7 +284,7 @@ Name | Type | Description  | Notes
 
 ## create_employee
 
-> EmployeeObject create_employee(xero_tenant_id, employee)
+> EmployeeObject create_employee(xero_tenant_id, employee, opts)
 
 Creates an employees
 
@@ -300,9 +315,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee = { "title": "Mr", "firstName": "Mike", "lastName": "Johntzxzpxhmkgson", "dateOfBirth": "2000-01-01", "address": { "addressLine1": "101 Green St", "city": "San Francisco", "postCode": "4351", "countryName": "United Kingdom" }, "email": "83139@starkindustries.com", "gender": "M" } # Employee | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an employees
-  result = api_instance.create_employee(xero_tenant_id, employee)
+  result = api_instance.create_employee(xero_tenant_id, employee, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee: #{e}"
@@ -316,6 +335,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee** | [**Employee**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -333,7 +353,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_earnings_template
 
-> EarningsTemplateObject create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+> EarningsTemplateObject create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
 
 Creates earnings template records for an employee
 
@@ -365,9 +385,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 earnings_template = { "ratePerUnit": 20, "numberOfUnits": 8, "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "name": "My New One" } # EarningsTemplate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates earnings template records for an employee
-  result = api_instance.create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+  result = api_instance.create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_earnings_template: #{e}"
@@ -382,6 +406,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **earnings_template** | [**EarningsTemplate**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -399,7 +424,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_leave
 
-> EmployeeLeaveObject create_employee_leave(xero_tenant_id, employee_id, employee_leave)
+> EmployeeLeaveObject create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts)
 
 Creates leave records for a specific employee
 
@@ -431,9 +456,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_leave = { "leaveTypeID": "b0b1b79e-2a25-46c2-ad08-ca25ef48d7e4", "description": "Creating a Description", "startDate": "2020-04-24", "endDate": "2020-04-26" } # EmployeeLeave | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates leave records for a specific employee
-  result = api_instance.create_employee_leave(xero_tenant_id, employee_id, employee_leave)
+  result = api_instance.create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_leave: #{e}"
@@ -448,6 +477,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_leave** | [**EmployeeLeave**](EmployeeLeave.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -465,7 +495,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_leave_setup
 
-> EmployeeLeaveSetupObject create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setup)
+> EmployeeLeaveSetupObject create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setup, opts)
 
 Creates a leave set-up for a specific employee. This is required before viewing, configuring and requesting leave for an employee
 
@@ -497,9 +527,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_leave_setup = { "holidayPayOpeningBalance": 10, "annualLeaveOpeningBalance": 100, "sickLeaveHoursToAccrueAnnually": 20, "sickLeaveOpeningBalance": 10 } # EmployeeLeaveSetup | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a leave set-up for a specific employee. This is required before viewing, configuring and requesting leave for an employee
-  result = api_instance.create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setup)
+  result = api_instance.create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setup, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_leave_setup: #{e}"
@@ -514,6 +548,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_leave_setup** | [**EmployeeLeaveSetup**](EmployeeLeaveSetup.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -531,7 +566,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_leave_type
 
-> EmployeeLeaveTypeObject create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type)
+> EmployeeLeaveTypeObject create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts)
 
 Creates leave type records for a specific employee
 
@@ -563,9 +598,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_leave_type = { "leaveTypeID": "35da97ae-05b9-427f-9a98-69157ba42cec", "scheduleOfAccrual": "AnnuallyAfter6Months", "hoursAccruedAnnually": 10, "maximumToAccrue": 80, "openingBalance": 100, "rateAccruedHourly": 3.5 } # EmployeeLeaveType | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates leave type records for a specific employee
-  result = api_instance.create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type)
+  result = api_instance.create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_leave_type: #{e}"
@@ -580,6 +619,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_leave_type** | [**EmployeeLeaveType**](EmployeeLeaveType.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -597,7 +637,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_opening_balances
 
-> EmployeeOpeningBalancesObject create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balance)
+> EmployeeOpeningBalancesObject create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balance, opts)
 
 Creates opening balances for a specific employee
 
@@ -629,9 +669,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_opening_balance = [{"periodEndDate":"2020-10-01","daysPaid":3,"unpaidWeeks":2,"grossEarnings":40.0}] # Array<EmployeeOpeningBalance> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates opening balances for a specific employee
-  result = api_instance.create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balance)
+  result = api_instance.create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balance, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_opening_balances: #{e}"
@@ -646,6 +690,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_opening_balance** | [**Array&lt;EmployeeOpeningBalance&gt;**](EmployeeOpeningBalance.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -663,7 +708,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_payment_method
 
-> PaymentMethodObject create_employee_payment_method(xero_tenant_id, employee_id, payment_method)
+> PaymentMethodObject create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts)
 
 Creates a payment method for an employee
 
@@ -695,9 +740,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 payment_method = XeroRuby::PayrollNz::PaymentMethod.new # PaymentMethod | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a payment method for an employee
-  result = api_instance.create_employee_payment_method(xero_tenant_id, employee_id, payment_method)
+  result = api_instance.create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_payment_method: #{e}"
@@ -712,6 +761,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **payment_method** | [**PaymentMethod**](PaymentMethod.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -729,7 +779,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_salary_and_wage
 
-> SalaryAndWageObject create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage)
+> SalaryAndWageObject create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts)
 
 Creates an employee salary and wage record
 
@@ -761,9 +811,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 salary_and_wage = { "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnitsPerWeek": 2, "ratePerUnit": 10, "numberOfUnitsPerDay": 2, "daysPerWeek": 1, "effectiveFrom": "2020-05-01", "annualSalary": 100, "status": "Active", "paymentType": "Salary" } # SalaryAndWage | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an employee salary and wage record
-  result = api_instance.create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage)
+  result = api_instance.create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employee_salary_and_wage: #{e}"
@@ -778,6 +832,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **salary_and_wage** | [**SalaryAndWage**](SalaryAndWage.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -795,7 +850,7 @@ Name | Type | Description  | Notes
 
 ## create_employment
 
-> EmploymentObject create_employment(xero_tenant_id, employee_id, employment)
+> EmploymentObject create_employment(xero_tenant_id, employee_id, employment, opts)
 
 Creates an employment detail for a specific employee
 
@@ -827,9 +882,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employment = { "payrollCalendarID": "9aa56064-990f-4ad3-a189-d966d8f6a030", "startDate": "2020-09-02" } # Employment | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an employment detail for a specific employee
-  result = api_instance.create_employment(xero_tenant_id, employee_id, employment)
+  result = api_instance.create_employment(xero_tenant_id, employee_id, employment, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_employment: #{e}"
@@ -844,6 +903,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employment** | [**Employment**](Employment.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -861,7 +921,7 @@ Name | Type | Description  | Notes
 
 ## create_leave_type
 
-> LeaveTypeObject create_leave_type(xero_tenant_id, leave_type)
+> LeaveTypeObject create_leave_type(xero_tenant_id, leave_type, opts)
 
 Creates a new leave type
 
@@ -892,9 +952,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_type = { "name": "My wqwhhiktun Leave", "isPaidLeave": false, "showOnPayslip": true } # LeaveType | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new leave type
-  result = api_instance.create_leave_type(xero_tenant_id, leave_type)
+  result = api_instance.create_leave_type(xero_tenant_id, leave_type, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_leave_type: #{e}"
@@ -908,6 +972,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_type** | [**LeaveType**](LeaveType.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -925,7 +990,7 @@ Name | Type | Description  | Notes
 
 ## create_multiple_employee_earnings_template
 
-> EmployeeEarningsTemplates create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+> EmployeeEarningsTemplates create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
 
 Creates multiple employee earnings template records for a specific employee
 
@@ -957,9 +1022,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 earnings_template = [{"ratePerUnit":20.0,"numberOfUnits":8.0,"earningsRateID":"f9d8f5b5-9049-47f4-8541-35e200f750a5"},{"ratePerUnit":0.0,"numberOfUnits":8.0,"earningsRateID":"65b83d94-f20f-45e1-85ae-387fcf460c26"}] # Array<EarningsTemplate> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates multiple employee earnings template records for a specific employee
-  result = api_instance.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+  result = api_instance.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_multiple_employee_earnings_template: #{e}"
@@ -974,6 +1043,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **earnings_template** | [**Array&lt;EarningsTemplate&gt;**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -991,7 +1061,7 @@ Name | Type | Description  | Notes
 
 ## create_pay_run
 
-> PayRunObject create_pay_run(xero_tenant_id, pay_run)
+> PayRunObject create_pay_run(xero_tenant_id, pay_run, opts)
 
 Creates a pay run
 
@@ -1022,9 +1092,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run = { "payrollCalendarID": "9aa56064-990f-4ad3-a189-d966d8f6a030", "periodStartDate": "2020-09-08", "periodEndDate": "2020-09-15", "paymentDate": "2020-09-20", "payRunStatus": "Draft", "payRunType": "Scheduled", "calendarType": "Weekly" } # PayRun | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a pay run
-  result = api_instance.create_pay_run(xero_tenant_id, pay_run)
+  result = api_instance.create_pay_run(xero_tenant_id, pay_run, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_pay_run: #{e}"
@@ -1038,6 +1112,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run** | [**PayRun**](PayRun.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1055,7 +1130,7 @@ Name | Type | Description  | Notes
 
 ## create_pay_run_calendar
 
-> PayRunCalendarObject create_pay_run_calendar(xero_tenant_id, pay_run_calendar)
+> PayRunCalendarObject create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts)
 
 Creates a new payrun calendar
 
@@ -1086,9 +1161,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run_calendar = { "name": "My Weekly Cal", "calendarType": "Weekly", "periodStartDate": "2020-05-01", "paymentDate": "2020-05-15" } # PayRunCalendar | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new payrun calendar
-  result = api_instance.create_pay_run_calendar(xero_tenant_id, pay_run_calendar)
+  result = api_instance.create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_pay_run_calendar: #{e}"
@@ -1102,6 +1181,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run_calendar** | [**PayRunCalendar**](PayRunCalendar.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1119,7 +1199,7 @@ Name | Type | Description  | Notes
 
 ## create_reimbursement
 
-> ReimbursementObject create_reimbursement(xero_tenant_id, reimbursement)
+> ReimbursementObject create_reimbursement(xero_tenant_id, reimbursement, opts)
 
 Creates a new reimbursement
 
@@ -1150,9 +1230,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 reimbursement = { "name": "My new Reimburse", "accountID": "fa5cdc43-643b-4ad8-b4ac-3ffe0d0f4488", "reimbursementCategory": "GSTInclusive", "calculationType": "FixedAmount" } # Reimbursement | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new reimbursement
-  result = api_instance.create_reimbursement(xero_tenant_id, reimbursement)
+  result = api_instance.create_reimbursement(xero_tenant_id, reimbursement, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_reimbursement: #{e}"
@@ -1166,6 +1250,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **reimbursement** | [**Reimbursement**](Reimbursement.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1183,7 +1268,7 @@ Name | Type | Description  | Notes
 
 ## create_superannuation
 
-> SuperannuationObject create_superannuation(xero_tenant_id, benefit)
+> SuperannuationObject create_superannuation(xero_tenant_id, benefit, opts)
 
 Creates a new superannuation
 
@@ -1214,9 +1299,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 benefit = { "name": "SidSaver", "category": "Other", "liabilityAccountId": "568f2e9a-0870-46cc-8678-f83f132ed4e3", "expenseAccountId": "e4eb36f6-97e3-4427-a394-dd4e1b355c2e", "CalculationTypeNZ": "FixedAmount", "standardAmount": 10 } # Benefit | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new superannuation
-  result = api_instance.create_superannuation(xero_tenant_id, benefit)
+  result = api_instance.create_superannuation(xero_tenant_id, benefit, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_superannuation: #{e}"
@@ -1230,6 +1319,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **benefit** | [**Benefit**](Benefit.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1247,7 +1337,7 @@ Name | Type | Description  | Notes
 
 ## create_timesheet
 
-> TimesheetObject create_timesheet(xero_tenant_id, timesheet)
+> TimesheetObject create_timesheet(xero_tenant_id, timesheet, opts)
 
 Creates a new timesheet
 
@@ -1278,9 +1368,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet = { "payrollCalendarID": "9aa56064-990f-4ad3-a189-d966d8f6a030", "employeeID": "68342973-c405-4b86-b5d3-d7b877c27995", "startDate": "2020-04-13", "endDate": "2020-04-19", "timesheetLines": [ { "date": "2020-04-13", "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnits": 8 }, { "date": "2020-04-15", "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnits": 6 } ] } # Timesheet | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new timesheet
-  result = api_instance.create_timesheet(xero_tenant_id, timesheet)
+  result = api_instance.create_timesheet(xero_tenant_id, timesheet, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_timesheet: #{e}"
@@ -1294,6 +1388,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet** | [**Timesheet**](Timesheet.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1311,7 +1406,7 @@ Name | Type | Description  | Notes
 
 ## create_timesheet_line
 
-> TimesheetLineObject create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line)
+> TimesheetLineObject create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts)
 
 Create a new timesheet line for a specific time sheet
 
@@ -1343,9 +1438,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
 timesheet_line = { "date": "2020-08-03", "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnits": 1 } # TimesheetLine | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Create a new timesheet line for a specific time sheet
-  result = api_instance.create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line)
+  result = api_instance.create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->create_timesheet_line: #{e}"
@@ -1360,6 +1459,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
  **timesheet_line** | [**TimesheetLine**](TimesheetLine.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -3951,7 +4051,7 @@ Name | Type | Description  | Notes
 
 ## revert_timesheet
 
-> TimesheetObject revert_timesheet(xero_tenant_id, timesheet_id)
+> TimesheetObject revert_timesheet(xero_tenant_id, timesheet_id, opts)
 
 Reverts a timesheet to draft
 
@@ -3982,9 +4082,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Reverts a timesheet to draft
-  result = api_instance.revert_timesheet(xero_tenant_id, timesheet_id)
+  result = api_instance.revert_timesheet(xero_tenant_id, timesheet_id, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->revert_timesheet: #{e}"
@@ -3998,6 +4102,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4015,7 +4120,7 @@ Name | Type | Description  | Notes
 
 ## update_employee
 
-> EmployeeObject update_employee(xero_tenant_id, employee_id, employee)
+> EmployeeObject update_employee(xero_tenant_id, employee_id, employee, opts)
 
 Updates an existing employee
 
@@ -4047,9 +4152,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee = { "title": "Mr", "firstName": "Tony", "lastName": "Starkgtrzgquusrson", "dateOfBirth": "1999-01-01", "address": { "addressLine1": "101 Green St", "city": "San Francisco", "postCode": "4432", "countryName": "United Kingdom" }, "email": "58315@starkindustries.com", "gender": "M" } # Employee | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates an existing employee
-  result = api_instance.update_employee(xero_tenant_id, employee_id, employee)
+  result = api_instance.update_employee(xero_tenant_id, employee_id, employee, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_employee: #{e}"
@@ -4064,6 +4173,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee** | [**Employee**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4081,7 +4191,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_earnings_template
 
-> EarningsTemplateObject update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template)
+> EarningsTemplateObject update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
 
 Updates an earnings template records for an employee
 
@@ -4114,9 +4224,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 pay_template_earning_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6' # String | Id for single pay template earnings object
 earnings_template = { "ratePerUnit": 25, "numberOfUnits": 4, "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5" } # EarningsTemplate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates an earnings template records for an employee
-  result = api_instance.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template)
+  result = api_instance.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_employee_earnings_template: #{e}"
@@ -4132,6 +4246,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **pay_template_earning_id** | [**String**](.md)| Id for single pay template earnings object | 
  **earnings_template** | [**EarningsTemplate**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4149,7 +4264,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_leave
 
-> EmployeeLeaveObject update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave)
+> EmployeeLeaveObject update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
 
 Updates leave records for a specific employee
 
@@ -4182,9 +4297,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 leave_id = 'c4be24e5-e840-4c92-9eaa-2d86cd596314' # String | Leave id for single object
 employee_leave = { "leaveTypeID": "b0b1b79e-2a25-46c2-ad08-ca25ef48d7e4", "description": "Creating a Description", "startDate": "2020-04-24", "endDate": "2020-04-26", "periods": [ { "periodStartDate": "2020-04-20", "periodEndDate": "2020-04-26", "numberOfUnits": 1, "periodStatus": "Approved" } ] } # EmployeeLeave | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates leave records for a specific employee
-  result = api_instance.update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave)
+  result = api_instance.update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_employee_leave: #{e}"
@@ -4200,6 +4319,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **leave_id** | [**String**](.md)| Leave id for single object | 
  **employee_leave** | [**EmployeeLeave**](EmployeeLeave.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4217,7 +4337,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_salary_and_wage
 
-> SalaryAndWageObject update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage)
+> SalaryAndWageObject update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
 
 Updates an employee's salary and wages record
 
@@ -4250,9 +4370,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 salary_and_wages_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6' # String | Id for single pay template earnings object
 salary_and_wage = { "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnitsPerWeek": 3, "ratePerUnit": 11, "numberOfUnitsPerDay": 3, "daysPerWeek": 1, "effectiveFrom": "2020-05-15", "annualSalary": 101, "status": "Active", "paymentType": "Salary" } # SalaryAndWage | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates an employee's salary and wages record
-  result = api_instance.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage)
+  result = api_instance.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_employee_salary_and_wage: #{e}"
@@ -4268,6 +4392,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **salary_and_wages_id** | [**String**](.md)| Id for single pay template earnings object | 
  **salary_and_wage** | [**SalaryAndWage**](SalaryAndWage.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4285,7 +4410,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_tax
 
-> EmployeeTaxObject update_employee_tax(xero_tenant_id, employee_id, employee_tax)
+> EmployeeTaxObject update_employee_tax(xero_tenant_id, employee_id, employee_tax, opts)
 
 Updates the tax records for a specific employee
 
@@ -4317,9 +4442,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_tax = XeroRuby::PayrollNz::EmployeeTax.new # EmployeeTax | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates the tax records for a specific employee
-  result = api_instance.update_employee_tax(xero_tenant_id, employee_id, employee_tax)
+  result = api_instance.update_employee_tax(xero_tenant_id, employee_id, employee_tax, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_employee_tax: #{e}"
@@ -4334,6 +4463,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_tax** | [**EmployeeTax**](EmployeeTax.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4351,7 +4481,7 @@ Name | Type | Description  | Notes
 
 ## update_pay_run
 
-> PayRunObject update_pay_run(xero_tenant_id, pay_run_id, pay_run)
+> PayRunObject update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
 
 Updates a pay run
 
@@ -4383,9 +4513,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run_id = 'pay_run_id_example' # String | Identifier for the pay run
 pay_run = { "paymentDate": "2019-07-01" } # PayRun | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a pay run
-  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, pay_run)
+  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_pay_run: #{e}"
@@ -4400,6 +4534,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run_id** | [**String**](.md)| Identifier for the pay run | 
  **pay_run** | [**PayRun**](PayRun.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4417,7 +4552,7 @@ Name | Type | Description  | Notes
 
 ## update_pay_slip_line_items
 
-> PaySlipObject update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip)
+> PaySlipObject update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip, opts)
 
 Creates an employee pay slip
 
@@ -4449,9 +4584,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_slip_id = 'pay_slip_id_example' # String | Identifier for the payslip
 pay_slip = { "earningsLines": [ { "earningsLineID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "displayName": "Ordinary Time", "ratePerUnit": 25, "numberOfUnits": 0, "amount": 0, "isLinkedToTimesheet": false, "isSystemGenerated": true }, { "earningsLineID": "65b83d94-f20f-45e1-85ae-387fcf460c26", "earningsRateID": "65b83d94-f20f-45e1-85ae-387fcf460c26", "displayName": "Salary", "ratePerUnit": 0, "numberOfUnits": 8, "amount": 0, "isLinkedToTimesheet": false, "isSystemGenerated": false } ], "leaveEarningsLines": [ { "earningsLineID": "0441497f-5dc7-4cd3-a90d-f2e07e21b2a6", "earningsRateID": "39b3560a-5d2f-4538-924a-4349dc86396e", "displayName": "Holiday Pay", "fixedAmount": 268.8, "amount": 268.8, "isLinkedToTimesheet": false, "isSystemGenerated": true } ], "deductionLines": [ { "deductionTypeID": "a3760fe4-68a4-4e38-8326-fe616af7dc74", "amount": 100 } ], "leaveAccrualLines": [ { "leaveTypeID": "0441497f-5dc7-4cd3-a90d-f2e07e21b2a6", "numberOfUnits": 268.8 }, { "leaveTypeID": "b0b1b79e-2a25-46c2-ad08-ca25ef48d7e4", "numberOfUnits": 0 }, { "leaveTypeID": "f2f994cf-1899-46f3-ad4f-5d92d78c3719", "numberOfUnits": 0 }, { "leaveTypeID": "34129765-11cb-4d8c-b568-84a2219beda3", "numberOfUnits": 0 } ], "superannuationLines": [ { "superannuationTypeID": "563273ea-0dae-4f82-86a4-e0db77c008ea", "displayName": "KiwiSaver", "amount": 108.86, "fixedAmount": 3, "percentage": 3, "manualAdjustment": false } ], "employeeTaxLines": [ { "taxLineID": "1084146b-e890-489c-aed3-06de80f63d84", "amount": 1057.22, "globalTaxTypeID": "11", "manualAdjustment": false } ], "employerTaxLines": [ { "taxLineID": "6f9eb8cd-0f4a-440b-939c-bdb0f6ad694c", "amount": 18.9, "globalTaxTypeID": "10", "manualAdjustment": false } ], "statutoryDeductionLines": [ { "statutoryDeductionTypeID": "b5efd8d1-0c93-4a14-a314-b5cba4a4e6b3", "amount": 108.86 } ], "grossEarningsHistory": { "daysPaid": 3, "unpaidWeeks": 0 } } # PaySlip | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an employee pay slip
-  result = api_instance.update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip)
+  result = api_instance.update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_pay_slip_line_items: #{e}"
@@ -4466,6 +4605,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_slip_id** | [**String**](.md)| Identifier for the payslip | 
  **pay_slip** | [**PaySlip**](PaySlip.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4483,7 +4623,7 @@ Name | Type | Description  | Notes
 
 ## update_timesheet_line
 
-> TimesheetLineObject update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line)
+> TimesheetLineObject update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
 
 Updates a timesheet line for a specific timesheet
 
@@ -4516,9 +4656,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
 timesheet_line_id = 'timesheet_line_id_example' # String | Identifier for the timesheet line
 timesheet_line = { "date": "2020-08-04", "earningsRateID": "f9d8f5b5-9049-47f4-8541-35e200f750a5", "numberOfUnits": 2 } # TimesheetLine | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a timesheet line for a specific timesheet
-  result = api_instance.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line)
+  result = api_instance.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
   p result
 rescue XeroRuby::PayrollNz::ApiError => e
   puts "Exception when calling PayrollNzApi->update_timesheet_line: #{e}"
@@ -4534,6 +4678,7 @@ Name | Type | Description  | Notes
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
  **timesheet_line_id** | [**String**](.md)| Identifier for the timesheet line | 
  **timesheet_line** | [**TimesheetLine**](TimesheetLine.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/payroll_nz/index.html b/docs/payroll_nz/index.html
index 0bde9be5..089b11b4 100644
--- a/docs/payroll_nz/index.html
+++ b/docs/payroll_nz/index.html
@@ -1502,6 +1502,11 @@
       "description" : "UTC timestamp when the employee was created in Xero",
       "format" : "date-time",
       "x-is-datetime" : true
+    },
+    "jobTitle" : {
+      "type" : "string",
+      "description" : "Employee's job title",
+      "example" : "General Manager"
     }
   },
   "description" : ""
@@ -3838,7 +3843,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="PayrollNz"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="PayrollNz"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="PayrollNz"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="PayrollNz"><a href="#api-PayrollNz">Methods</a></li>
               <li data-group="PayrollNz" data-name="approveTimesheet" class="">
                 <a href="#api-PayrollNz-approveTimesheet">approveTimesheet</a>
@@ -4089,9 +4094,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.approve_timesheet(xero_tenant_id, timesheet_id)
+  response = xero_client.accounting_api.approve_timesheet(xero_tenant_id, timesheet_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling approve_timesheet: #{e}"
@@ -4169,6 +4175,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_approveTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4201,6 +4227,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 deduction = { 
   deduction_name: "Deduction test",
@@ -4209,7 +4236,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_deduction(xero_tenant_id, deduction)
+  response = xero_client.accounting_api.create_deduction(xero_tenant_id, deduction, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_deduction: #{e}"
@@ -4254,6 +4281,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createDeduction_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4322,6 +4369,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 earnings_rate = { 
   earnings_type:  XeroRuby::PayrollNz::EarningsRate::EarningsTypeEnum::REGULAREARNINGS,
@@ -4330,7 +4378,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_earnings_rate(xero_tenant_id, earningsRate)
+  response = xero_client.accounting_api.create_earnings_rate(xero_tenant_id, earningsRate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_earnings_rate: #{e}"
@@ -4375,6 +4423,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEarningsRate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4443,6 +4511,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 address = { 
@@ -4460,7 +4529,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee)
+  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee: #{e}"
@@ -4505,6 +4574,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4574,6 +4663,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -4587,7 +4677,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.create_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate)
+  response = xero_client.accounting_api.create_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_earnings_template: #{e}"
@@ -4665,6 +4755,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4734,6 +4844,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -4744,7 +4855,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_leave(xero_tenant_id, employee_id, employeeLeave)
+  response = xero_client.accounting_api.create_employee_leave(xero_tenant_id, employee_id, employeeLeave, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_leave: #{e}"
@@ -4822,6 +4933,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeLeave_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4891,6 +5022,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 employee_leave_setup = { 
   include_holiday_pay: false,
@@ -4902,7 +5034,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_leave_setup(xero_tenant_id, employee_id, employeeLeaveSetup)
+  response = xero_client.accounting_api.create_employee_leave_setup(xero_tenant_id, employee_id, employeeLeaveSetup, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_leave_setup: #{e}"
@@ -4980,6 +5112,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeLeaveSetup_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5049,6 +5201,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 employee_leave_type = { 
   leave_type_id: "00000000-0000-0000-0000-000000000000",
@@ -5057,7 +5210,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_leave_type(xero_tenant_id, employee_id, employeeLeaveType)
+  response = xero_client.accounting_api.create_employee_leave_type(xero_tenant_id, employee_id, employeeLeaveType, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_leave_type: #{e}"
@@ -5135,6 +5288,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeLeaveType_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5204,6 +5377,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 period_end_date = 'YYYY-MM-DD'
 
 employee_opening_balance = { 
@@ -5216,7 +5390,7 @@ <h3>Usage and SDK Samples</h3>
 employee_opening_balances << employee_opening_balance
 
 begin
-  response = xero_client.accounting_api.create_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalance)
+  response = xero_client.accounting_api.create_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalance, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_opening_balances: #{e}"
@@ -5294,6 +5468,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeOpeningBalances_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5363,6 +5557,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 bank_account = { 
   account_name: "Charlotte Danes",
@@ -5377,7 +5572,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_payment_method(xero_tenant_id, employee_id, paymentMethod)
+  response = xero_client.accounting_api.create_employee_payment_method(xero_tenant_id, employee_id, paymentMethod, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_payment_method: #{e}"
@@ -5455,6 +5650,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeePaymentMethod_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5523,6 +5738,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 salary_and_wage = { 
   earnings_rate_id: "00000000-0000-0000-0000-000000000000",
@@ -5532,7 +5748,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_salary_and_wage(xero_tenant_id, employee_id, salaryAndWage)
+  response = xero_client.accounting_api.create_employee_salary_and_wage(xero_tenant_id, employee_id, salaryAndWage, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_salary_and_wage: #{e}"
@@ -5610,6 +5826,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeSalaryAndWage_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5679,6 +5915,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 
 employment = { 
@@ -5687,7 +5924,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employment(xero_tenant_id, employee_id, employment)
+  response = xero_client.accounting_api.create_employment(xero_tenant_id, employee_id, employment, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employment: #{e}"
@@ -5765,6 +6002,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5833,6 +6090,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 leave_type = { 
   name: "LeaveType",
@@ -5841,7 +6099,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_leave_type(xero_tenant_id, leaveType)
+  response = xero_client.accounting_api.create_leave_type(xero_tenant_id, leaveType, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_leave_type: #{e}"
@@ -5886,6 +6144,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createLeaveType_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5955,6 +6233,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -5968,7 +6247,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate)
+  response = xero_client.accounting_api.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_multiple_employee_earnings_template: #{e}"
@@ -6046,6 +6325,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createMultipleEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6114,6 +6413,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 pay_run = { 
   pay_run_type:  XeroRuby::PayrollNz::PayRun::pay_run_type_enum::SCHEDULED,
@@ -6121,7 +6421,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_pay_run(xero_tenant_id, payRun)
+  response = xero_client.accounting_api.create_pay_run(xero_tenant_id, payRun, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_pay_run: #{e}"
@@ -6166,6 +6466,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayRun_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6234,6 +6554,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 payment_date = 'YYYY-MM-DD'
 
@@ -6244,7 +6565,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_pay_run_calendar(xero_tenant_id, payRunCalendar)
+  response = xero_client.accounting_api.create_pay_run_calendar(xero_tenant_id, payRunCalendar, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_pay_run_calendar: #{e}"
@@ -6289,6 +6610,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayRunCalendar_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6357,6 +6698,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 reimbursement = { 
   name: "Test Reimbursement",
@@ -6367,7 +6709,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_reimbursement(xero_tenant_id, reimbursement)
+  response = xero_client.accounting_api.create_reimbursement(xero_tenant_id, reimbursement, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_reimbursement: #{e}"
@@ -6412,6 +6754,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createReimbursement_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6480,6 +6842,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 benefit = { 
   category:  XeroRuby::PayrollNz::Benefit::CategoryEnum::COMPLYINGFUND,
@@ -6491,7 +6854,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_superannuation(xero_tenant_id, benefit)
+  response = xero_client.accounting_api.create_superannuation(xero_tenant_id, benefit, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_superannuation: #{e}"
@@ -6536,6 +6899,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createSuperannuation_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6604,6 +6987,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -6615,7 +6999,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet)
+  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_timesheet: #{e}"
@@ -6660,6 +7044,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6729,6 +7133,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 date = 'YYYY-MM-DD'
 
 timesheet_line = { 
@@ -6740,7 +7145,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_timesheet_line(xero_tenant_id, timesheet_id, timesheetLine)
+  response = xero_client.accounting_api.create_timesheet_line(xero_tenant_id, timesheet_id, timesheetLine, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_timesheet_line: #{e}"
@@ -6818,6 +7223,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimesheetLine_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11743,9 +12168,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.revert_timesheet(xero_tenant_id, timesheet_id)
+  response = xero_client.accounting_api.revert_timesheet(xero_tenant_id, timesheet_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling revert_timesheet: #{e}"
@@ -11823,6 +12249,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_revertTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11856,6 +12302,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 address = { 
@@ -11873,7 +12320,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee)
+  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee: #{e}"
@@ -11951,6 +12398,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12021,6 +12488,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 pay_template_earning_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -12034,7 +12502,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earningsTemplate)
+  response = xero_client.accounting_api.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_earnings_template: #{e}"
@@ -12138,6 +12606,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12208,6 +12696,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 leave_id = 'c4be24e5-e840-4c92-9eaa-2d86cd596314'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -12218,7 +12707,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_leave(xero_tenant_id, employee_id, leave_id, employeeLeave)
+  response = xero_client.accounting_api.update_employee_leave(xero_tenant_id, employee_id, leave_id, employeeLeave, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_leave: #{e}"
@@ -12322,6 +12811,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeLeave_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12392,6 +12901,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 salary_and_wages_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+idempotency_key = 'KEY_VALUE'
 
 salary_and_wage = { 
   earnings_rate_id: "00000000-0000-0000-0000-000000000000",
@@ -12401,7 +12911,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salaryAndWage)
+  response = xero_client.accounting_api.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salaryAndWage, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_salary_and_wage: #{e}"
@@ -12505,6 +13015,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeSalaryAndWage_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12574,6 +13104,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 student_loan_as_at = 'YYYY-MM-DD'
 
 employee_tax = { 
@@ -12592,7 +13123,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_tax(xero_tenant_id, employee_id, employeeTax)
+  response = xero_client.accounting_api.update_employee_tax(xero_tenant_id, employee_id, employeeTax, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_tax: #{e}"
@@ -12670,6 +13201,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeTax_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12738,6 +13289,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 pay_run_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 payment_date = 'YYYY-MM-DD'
 
@@ -12748,7 +13300,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun)
+  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_pay_run: #{e}"
@@ -12826,6 +13378,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePayRun_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12895,6 +13467,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 pay_slip_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 earnings_line = { 
   earnings_line_id: "00000000-0000-0000-0000-000000000000",
@@ -12912,7 +13485,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_pay_slip_line_items(xero_tenant_id, pay_slip_id, paySlip)
+  response = xero_client.accounting_api.update_pay_slip_line_items(xero_tenant_id, pay_slip_id, paySlip, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_pay_slip_line_items: #{e}"
@@ -12990,6 +13563,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePaySlipLineItems_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -13060,6 +13653,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
 timesheet_line_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 date = 'YYYY-MM-DD'
 
 timesheet_line = { 
@@ -13071,7 +13665,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheetLine)
+  response = xero_client.accounting_api.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheetLine, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_timesheet_line: #{e}"
@@ -13175,6 +13769,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTimesheetLine_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/docs/payroll_uk/PayrollUkApi.md b/docs/payroll_uk/PayrollUkApi.md
index 9376b1a7..9b3b2beb 100644
--- a/docs/payroll_uk/PayrollUkApi.md
+++ b/docs/payroll_uk/PayrollUkApi.md
@@ -79,7 +79,7 @@ Method | HTTP request | Description
 
 ## approve_timesheet
 
-> TimesheetObject approve_timesheet(xero_tenant_id, timesheet_id)
+> TimesheetObject approve_timesheet(xero_tenant_id, timesheet_id, opts)
 
 Approves a specific timesheet
 
@@ -110,9 +110,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Approves a specific timesheet
-  result = api_instance.approve_timesheet(xero_tenant_id, timesheet_id)
+  result = api_instance.approve_timesheet(xero_tenant_id, timesheet_id, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->approve_timesheet: #{e}"
@@ -126,6 +130,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -143,7 +148,7 @@ Name | Type | Description  | Notes
 
 ## create_benefit
 
-> BenefitObject create_benefit(xero_tenant_id, benefit)
+> BenefitObject create_benefit(xero_tenant_id, benefit, opts)
 
 Creates a new employee benefit
 
@@ -174,9 +179,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 benefit = { "name": "My Big Bennie", "category": "StakeholderPension", "liabilityAccountId": "e0faa299-ca0d-4b0a-9e32-0dfabdf9179a", "expenseAccountId": "4b03500d-32fd-4616-8d70-e1e56e0519c6", "standardAmount": 50, "percentage": 25, "calculationType": "PercentageOfGross" } # Benefit | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new employee benefit
-  result = api_instance.create_benefit(xero_tenant_id, benefit)
+  result = api_instance.create_benefit(xero_tenant_id, benefit, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_benefit: #{e}"
@@ -190,6 +199,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **benefit** | [**Benefit**](Benefit.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -207,7 +217,7 @@ Name | Type | Description  | Notes
 
 ## create_deduction
 
-> DeductionObject create_deduction(xero_tenant_id, deduction)
+> DeductionObject create_deduction(xero_tenant_id, deduction, opts)
 
 Creates a new deduction
 
@@ -238,9 +248,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 deduction = { "deductionName": "My new deduction", "deductionCategory": "SalarySacrifice", "liabilityAccountId": "e0faa299-ca0d-4b0a-9e32-0dfabdf9179a", "calculationType": "FixedAmount" } # Deduction | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new deduction
-  result = api_instance.create_deduction(xero_tenant_id, deduction)
+  result = api_instance.create_deduction(xero_tenant_id, deduction, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_deduction: #{e}"
@@ -254,6 +268,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **deduction** | [**Deduction**](Deduction.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -271,7 +286,7 @@ Name | Type | Description  | Notes
 
 ## create_earnings_rate
 
-> EarningsRateObject create_earnings_rate(xero_tenant_id, earnings_rate)
+> EarningsRateObject create_earnings_rate(xero_tenant_id, earnings_rate, opts)
 
 Creates a new earnings rate
 
@@ -302,9 +317,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 earnings_rate = { "name": "My Earnings Rate", "earningsType": "RegularEarnings", "rateType": "RatePerUnit", "typeOfUnits": "hours", "expenseAccountID": "4b03500d-32fd-4616-8d70-e1e56e0519c6" } # EarningsRate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new earnings rate
-  result = api_instance.create_earnings_rate(xero_tenant_id, earnings_rate)
+  result = api_instance.create_earnings_rate(xero_tenant_id, earnings_rate, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_earnings_rate: #{e}"
@@ -318,6 +337,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **earnings_rate** | [**EarningsRate**](EarningsRate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -335,7 +355,7 @@ Name | Type | Description  | Notes
 
 ## create_employee
 
-> EmployeeObject create_employee(xero_tenant_id, employee)
+> EmployeeObject create_employee(xero_tenant_id, employee, opts)
 
 Creates employees
 
@@ -366,9 +386,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee = { "title":"Mr", "firstName":"Mike", "lastName":"Fancy", "dateOfBirth":"1999-01-01T00:00:00", "gender":"M", "email":"mike@starkindustries.com", "isOffPayrollWorker": false, "address": { "addressLine1": "171 Midsummer", "city": "Milton Keyness", "postCode": "MK9 1EB" } } # Employee | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates employees
-  result = api_instance.create_employee(xero_tenant_id, employee)
+  result = api_instance.create_employee(xero_tenant_id, employee, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee: #{e}"
@@ -382,6 +406,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee** | [**Employee**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -399,7 +424,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_earnings_template
 
-> EarningsTemplateObject create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+> EarningsTemplateObject create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
 
 Creates an earnings template records for a specific employee
 
@@ -431,9 +456,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 earnings_template = XeroRuby::PayrollUk::EarningsTemplate.new # EarningsTemplate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an earnings template records for a specific employee
-  result = api_instance.create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+  result = api_instance.create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_earnings_template: #{e}"
@@ -448,6 +477,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **earnings_template** | [**EarningsTemplate**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -465,7 +495,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_leave
 
-> EmployeeLeaveObject create_employee_leave(xero_tenant_id, employee_id, employee_leave)
+> EmployeeLeaveObject create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts)
 
 Creates leave records for a specific employee
 
@@ -497,9 +527,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_leave = { "leaveTypeID": "1d2778ee-86ea-45c0-bbf8-1045485f6b3f", "description": "Creating a Description", "startDate": "2020-03-24", "endDate": "2020-03-26" } # EmployeeLeave | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates leave records for a specific employee
-  result = api_instance.create_employee_leave(xero_tenant_id, employee_id, employee_leave)
+  result = api_instance.create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_leave: #{e}"
@@ -514,6 +548,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_leave** | [**EmployeeLeave**](EmployeeLeave.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -531,7 +566,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_leave_type
 
-> EmployeeLeaveTypeObject create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type)
+> EmployeeLeaveTypeObject create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts)
 
 Creates employee leave type records
 
@@ -563,9 +598,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_leave_type = { "leaveTypeID": "4918f233-bd31-43f9-9633-bcc6de1178f2", "scheduleOfAccrual": "BeginningOfCalendarYear", "hoursAccruedAnnually": 10 } # EmployeeLeaveType | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates employee leave type records
-  result = api_instance.create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type)
+  result = api_instance.create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_leave_type: #{e}"
@@ -580,6 +619,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_leave_type** | [**EmployeeLeaveType**](EmployeeLeaveType.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -597,7 +637,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_opening_balances
 
-> EmployeeOpeningBalancesObject create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances)
+> EmployeeOpeningBalancesObject create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts)
 
 Creates an opening balance for a specific employee
 
@@ -629,9 +669,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_opening_balances = { "statutoryAdoptionPay": 10, "statutoryMaternityPay": 10, "statutoryPaternityPay": 10, "statutorySharedParentalPay": 10, "statutorySickPay": 10, "priorEmployeeNumber": 10 } # EmployeeOpeningBalances | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an opening balance for a specific employee
-  result = api_instance.create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances)
+  result = api_instance.create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_opening_balances: #{e}"
@@ -646,6 +690,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_opening_balances** | [**EmployeeOpeningBalances**](EmployeeOpeningBalances.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -663,7 +708,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_payment_method
 
-> PaymentMethodObject create_employee_payment_method(xero_tenant_id, employee_id, payment_method)
+> PaymentMethodObject create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts)
 
 Creates an employee payment method
 
@@ -695,9 +740,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 payment_method = { "paymentMethod": "Electronically", "bankAccounts": [ { "accountName": "Sid BofA", "accountNumber": "24987654", "sortCode": "287654" } ] } # PaymentMethod | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates an employee payment method
-  result = api_instance.create_employee_payment_method(xero_tenant_id, employee_id, payment_method)
+  result = api_instance.create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_payment_method: #{e}"
@@ -712,6 +761,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **payment_method** | [**PaymentMethod**](PaymentMethod.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -729,7 +779,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_salary_and_wage
 
-> SalaryAndWageObject create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage)
+> SalaryAndWageObject create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts)
 
 Creates a salary and wage record for a specific employee
 
@@ -761,9 +811,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 salary_and_wage = { "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnitsPerWeek": 2, "ratePerUnit": 10, "numberOfUnitsPerDay": 2, "effectiveFrom": "2020-05-01", "annualSalary": 100, "status": "ACTIVE", "paymentType": "Salary" } # SalaryAndWage | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a salary and wage record for a specific employee
-  result = api_instance.create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage)
+  result = api_instance.create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_salary_and_wage: #{e}"
@@ -778,6 +832,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **salary_and_wage** | [**SalaryAndWage**](SalaryAndWage.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -795,7 +850,7 @@ Name | Type | Description  | Notes
 
 ## create_employee_statutory_sick_leave
 
-> EmployeeStatutorySickLeaveObject create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick_leave)
+> EmployeeStatutorySickLeaveObject create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick_leave, opts)
 
 Creates statutory sick leave records
 
@@ -826,9 +881,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_statutory_sick_leave = { "employeeID": "aad6b292-7b94-408b-93f6-e489867e3fb0", "leaveTypeID": "aab78802-e9d3-4bbd-bc87-df858054988f", "startDate": "2020-04-21", "endDate": "2020-04-24", "workPattern": [ "Monday", "Tuesday", "Wednesday", "Thursday", "Friday" ], "isPregnancyRelated": false, "sufficientNotice": true } # EmployeeStatutorySickLeave | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates statutory sick leave records
-  result = api_instance.create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick_leave)
+  result = api_instance.create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick_leave, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employee_statutory_sick_leave: #{e}"
@@ -842,6 +901,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_statutory_sick_leave** | [**EmployeeStatutorySickLeave**](EmployeeStatutorySickLeave.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -859,7 +919,7 @@ Name | Type | Description  | Notes
 
 ## create_employment
 
-> EmploymentObject create_employment(xero_tenant_id, employee_id, employment)
+> EmploymentObject create_employment(xero_tenant_id, employee_id, employment, opts)
 
 Creates employment detail for a specific employee using a unique employee ID
 
@@ -891,9 +951,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employment = { "PayrollCalendarID": "216d80e6-af55-47b1-b718-9457c3f5d2fe", "StartDate": "2020-04-01", "EmployeeNumber": "123ABC", "NICategory": "A" } # Employment | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates employment detail for a specific employee using a unique employee ID
-  result = api_instance.create_employment(xero_tenant_id, employee_id, employment)
+  result = api_instance.create_employment(xero_tenant_id, employee_id, employment, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_employment: #{e}"
@@ -908,6 +972,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employment** | [**Employment**](Employment.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -925,7 +990,7 @@ Name | Type | Description  | Notes
 
 ## create_leave_type
 
-> LeaveTypeObject create_leave_type(xero_tenant_id, leave_type)
+> LeaveTypeObject create_leave_type(xero_tenant_id, leave_type, opts)
 
 Creates a new leave type
 
@@ -956,9 +1021,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 leave_type = { "name": "My opebvwbfxf Leave", "isPaidLeave": false, "showOnPayslip": true } # LeaveType | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new leave type
-  result = api_instance.create_leave_type(xero_tenant_id, leave_type)
+  result = api_instance.create_leave_type(xero_tenant_id, leave_type, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_leave_type: #{e}"
@@ -972,6 +1041,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **leave_type** | [**LeaveType**](LeaveType.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -989,7 +1059,7 @@ Name | Type | Description  | Notes
 
 ## create_multiple_employee_earnings_template
 
-> EmployeePayTemplates create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+> EmployeePayTemplates create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
 
 Creates multiple earnings template records for a specific employee using a unique employee ID
 
@@ -1021,9 +1091,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 earnings_template = [ { "ratePerUnit":20.0, "numberOfUnits":8.0, "earningsRateID":"87f5b43a-cf51-4b74-92de-94c819e82d27" }, { "ratePerUnit":20.0, "numberOfUnits":8.0, "earningsRateID":"973365f3-66b2-4c33-8ae6-14b75f78f68b" } ] # Array<EarningsTemplate> | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates multiple earnings template records for a specific employee using a unique employee ID
-  result = api_instance.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template)
+  result = api_instance.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_multiple_employee_earnings_template: #{e}"
@@ -1038,6 +1112,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **earnings_template** | [**Array&lt;EarningsTemplate&gt;**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1055,7 +1130,7 @@ Name | Type | Description  | Notes
 
 ## create_pay_run_calendar
 
-> PayRunCalendarObject create_pay_run_calendar(xero_tenant_id, pay_run_calendar)
+> PayRunCalendarObject create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts)
 
 Creates a new payrun calendar
 
@@ -1086,9 +1161,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run_calendar = { "name": "My Weekly Cal", "calendarType": "Weekly", "periodStartDate": "2020-05-01", "paymentDate": "2020-05-15" } # PayRunCalendar | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new payrun calendar
-  result = api_instance.create_pay_run_calendar(xero_tenant_id, pay_run_calendar)
+  result = api_instance.create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_pay_run_calendar: #{e}"
@@ -1102,6 +1181,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run_calendar** | [**PayRunCalendar**](PayRunCalendar.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1119,7 +1199,7 @@ Name | Type | Description  | Notes
 
 ## create_reimbursement
 
-> ReimbursementObject create_reimbursement(xero_tenant_id, reimbursement)
+> ReimbursementObject create_reimbursement(xero_tenant_id, reimbursement, opts)
 
 Creates a new reimbursement
 
@@ -1150,9 +1230,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 reimbursement = { "name": "My new Reimburse", "accountID": "9ee28149-32a9-4661-8eab-a28738696983" } # Reimbursement | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new reimbursement
-  result = api_instance.create_reimbursement(xero_tenant_id, reimbursement)
+  result = api_instance.create_reimbursement(xero_tenant_id, reimbursement, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_reimbursement: #{e}"
@@ -1166,6 +1250,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **reimbursement** | [**Reimbursement**](Reimbursement.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1183,7 +1268,7 @@ Name | Type | Description  | Notes
 
 ## create_timesheet
 
-> TimesheetObject create_timesheet(xero_tenant_id, timesheet)
+> TimesheetObject create_timesheet(xero_tenant_id, timesheet, opts)
 
 Creates a new timesheet
 
@@ -1214,9 +1299,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet = { "payrollCalendarID": "216d80e6-af55-47b1-b718-9457c3f5d2fe", "employeeID": "aad6b292-7b94-408b-93f6-e489867e3fb0", "startDate": "2020-04-13", "endDate": "2020-04-19", "timesheetLines": [ { "date": "2020-04-13", "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnits": 8 }, { "date": "2020-04-15", "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnits": 6 } ] } # Timesheet | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new timesheet
-  result = api_instance.create_timesheet(xero_tenant_id, timesheet)
+  result = api_instance.create_timesheet(xero_tenant_id, timesheet, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_timesheet: #{e}"
@@ -1230,6 +1319,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet** | [**Timesheet**](Timesheet.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1247,7 +1337,7 @@ Name | Type | Description  | Notes
 
 ## create_timesheet_line
 
-> TimesheetLineObject create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line)
+> TimesheetLineObject create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts)
 
 Creates a new timesheet line for a specific timesheet using a unique timesheet ID
 
@@ -1279,9 +1369,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
 timesheet_line = { "date": "2020-04-14", "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnits": 1 } # TimesheetLine | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a new timesheet line for a specific timesheet using a unique timesheet ID
-  result = api_instance.create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line)
+  result = api_instance.create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->create_timesheet_line: #{e}"
@@ -1296,6 +1390,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
  **timesheet_line** | [**TimesheetLine**](TimesheetLine.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4156,7 +4251,7 @@ Name | Type | Description  | Notes
 
 ## revert_timesheet
 
-> TimesheetObject revert_timesheet(xero_tenant_id, timesheet_id)
+> TimesheetObject revert_timesheet(xero_tenant_id, timesheet_id, opts)
 
 Reverts a specific timesheet to draft
 
@@ -4187,9 +4282,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Reverts a specific timesheet to draft
-  result = api_instance.revert_timesheet(xero_tenant_id, timesheet_id)
+  result = api_instance.revert_timesheet(xero_tenant_id, timesheet_id, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->revert_timesheet: #{e}"
@@ -4203,6 +4302,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4220,7 +4320,7 @@ Name | Type | Description  | Notes
 
 ## update_employee
 
-> EmployeeObject update_employee(xero_tenant_id, employee_id, employee)
+> EmployeeObject update_employee(xero_tenant_id, employee_id, employee, opts)
 
 Updates a specific employee's detail
 
@@ -4252,9 +4352,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee = { "title": "Mr.", "firstName": "TestDataUK", "lastName": "Tester", "dateOfBirth": "1992-11-22T00:00:00", "gender": "M", "email": "tester@gmail.com", "phoneNumber": "0400123456", "isOffPayrollWorker": false, "address": { "addressLine1": "171 Midsummer", "city": "Milton Keyness", "postCode": "MK9 1EB" } } # Employee | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific employee's detail
-  result = api_instance.update_employee(xero_tenant_id, employee_id, employee)
+  result = api_instance.update_employee(xero_tenant_id, employee_id, employee, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_employee: #{e}"
@@ -4269,6 +4373,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee** | [**Employee**](Employee.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4286,7 +4391,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_earnings_template
 
-> EarningsTemplateObject update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template)
+> EarningsTemplateObject update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
 
 Updates a specific employee's earnings template records
 
@@ -4319,9 +4424,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 pay_template_earning_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6' # String | Id for single pay template earnings object
 earnings_template = { "ratePerUnit": 30, "numberOfUnits": 4, "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27" } # EarningsTemplate | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific employee's earnings template records
-  result = api_instance.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template)
+  result = api_instance.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_employee_earnings_template: #{e}"
@@ -4337,6 +4446,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **pay_template_earning_id** | [**String**](.md)| Id for single pay template earnings object | 
  **earnings_template** | [**EarningsTemplate**](EarningsTemplate.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4354,7 +4464,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_leave
 
-> EmployeeLeaveObject update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave)
+> EmployeeLeaveObject update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
 
 Updates a specific employee's leave records
 
@@ -4387,9 +4497,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 leave_id = 'c4be24e5-e840-4c92-9eaa-2d86cd596314' # String | Leave id for single object
 employee_leave = { "leaveTypeID": "ed08dffe-788e-4b24-9630-f0fa2f4d164c", "description": "Creating a Description", "startDate": "2020-04-24", "endDate": "2020-04-26", "periods": [ { "periodStartDate": "2020-04-20", "periodEndDate": "2020-04-26", "numberOfUnits": 1, "periodStatus": "Approved" } ] } # EmployeeLeave | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific employee's leave records
-  result = api_instance.update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave)
+  result = api_instance.update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_employee_leave: #{e}"
@@ -4405,6 +4519,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **leave_id** | [**String**](.md)| Leave id for single object | 
  **employee_leave** | [**EmployeeLeave**](EmployeeLeave.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4422,7 +4537,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_opening_balances
 
-> EmployeeOpeningBalancesObject update_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances)
+> EmployeeOpeningBalancesObject update_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts)
 
 Updates a specific employee's opening balances
 
@@ -4454,9 +4569,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 employee_opening_balances = { "statutoryAdoptionPay": 20, "statutoryMaternityPay": 20, "statutoryPaternityPay": 20, "statutorySharedParentalPay": 20, "statutorySickPay": 20, "priorEmployeeNumber": 20 } # EmployeeOpeningBalances | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific employee's opening balances
-  result = api_instance.update_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances)
+  result = api_instance.update_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_employee_opening_balances: #{e}"
@@ -4471,6 +4590,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **employee_opening_balances** | [**EmployeeOpeningBalances**](EmployeeOpeningBalances.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4488,7 +4608,7 @@ Name | Type | Description  | Notes
 
 ## update_employee_salary_and_wage
 
-> SalaryAndWageObject update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage)
+> SalaryAndWageObject update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
 
 Updates salary and wages record for a specific employee
 
@@ -4521,9 +4641,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c' # String | Employee id for single object
 salary_and_wages_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6' # String | Id for single pay template earnings object
 salary_and_wage = { "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnitsPerWeek": 3, "ratePerUnit": 11, "effectiveFrom": "2020-05-15", "annualSalary": 101, "status": "ACTIVE", "paymentType": "Salary" } # SalaryAndWage | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates salary and wages record for a specific employee
-  result = api_instance.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage)
+  result = api_instance.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_employee_salary_and_wage: #{e}"
@@ -4539,6 +4663,7 @@ Name | Type | Description  | Notes
  **employee_id** | [**String**](.md)| Employee id for single object | 
  **salary_and_wages_id** | [**String**](.md)| Id for single pay template earnings object | 
  **salary_and_wage** | [**SalaryAndWage**](SalaryAndWage.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4556,7 +4681,7 @@ Name | Type | Description  | Notes
 
 ## update_pay_run
 
-> PayRunObject update_pay_run(xero_tenant_id, pay_run_id, pay_run)
+> PayRunObject update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
 
 Updates a specific pay run
 
@@ -4588,9 +4713,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 pay_run_id = 'pay_run_id_example' # String | Identifier for the pay run
 pay_run = { "paymentDate": "2020-05-01" } # PayRun | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific pay run
-  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, pay_run)
+  result = api_instance.update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_pay_run: #{e}"
@@ -4605,6 +4734,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **pay_run_id** | [**String**](.md)| Identifier for the pay run | 
  **pay_run** | [**PayRun**](PayRun.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -4622,7 +4752,7 @@ Name | Type | Description  | Notes
 
 ## update_timesheet_line
 
-> TimesheetLineObject update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line)
+> TimesheetLineObject update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
 
 Updates a specific timesheet line for a specific timesheet
 
@@ -4655,9 +4785,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 timesheet_id = 'timesheet_id_example' # String | Identifier for the timesheet
 timesheet_line_id = 'timesheet_line_id_example' # String | Identifier for the timesheet line
 timesheet_line = { "date": "2020-04-14", "earningsRateID": "87f5b43a-cf51-4b74-92de-94c819e82d27", "numberOfUnits": 2 } # TimesheetLine | 
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific timesheet line for a specific timesheet
-  result = api_instance.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line)
+  result = api_instance.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
   p result
 rescue XeroRuby::PayrollUk::ApiError => e
   puts "Exception when calling PayrollUkApi->update_timesheet_line: #{e}"
@@ -4673,6 +4807,7 @@ Name | Type | Description  | Notes
  **timesheet_id** | [**String**](.md)| Identifier for the timesheet | 
  **timesheet_line_id** | [**String**](.md)| Identifier for the timesheet line | 
  **timesheet_line** | [**TimesheetLine**](TimesheetLine.md)|  | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/payroll_uk/index.html b/docs/payroll_uk/index.html
index 6e45eea6..8eed13dc 100644
--- a/docs/payroll_uk/index.html
+++ b/docs/payroll_uk/index.html
@@ -3510,7 +3510,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="PayrollUk"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="PayrollUk"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="PayrollUk"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="PayrollUk"><a href="#api-PayrollUk">Methods</a></li>
               <li data-group="PayrollUk" data-name="approveTimesheet" class="">
                 <a href="#api-PayrollUk-approveTimesheet">approveTimesheet</a>
@@ -3767,9 +3767,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.approve_timesheet(xero_tenant_id, timesheet_id)
+  response = xero_client.accounting_api.approve_timesheet(xero_tenant_id, timesheet_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling approve_timesheet: #{e}"
@@ -3847,6 +3848,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_approveTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3879,6 +3900,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 benefit = { 
   name: "Benefit Name",
@@ -3888,7 +3910,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_benefit(xero_tenant_id, benefit)
+  response = xero_client.accounting_api.create_benefit(xero_tenant_id, benefit, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_benefit: #{e}"
@@ -3933,6 +3955,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createBenefit_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4001,6 +4043,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 deduction = { 
   deduction_name: "Test Deduction",
@@ -4010,7 +4053,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_deduction(xero_tenant_id, deduction)
+  response = xero_client.accounting_api.create_deduction(xero_tenant_id, deduction, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_deduction: #{e}"
@@ -4055,6 +4098,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createDeduction_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4123,6 +4186,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 earnings_rate = { 
   earnings_type:  XeroRuby::PayrollUk::EarningsRate::earnings_type_enum::REGULAREARNINGS,
@@ -4132,7 +4196,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_earnings_rate(xero_tenant_id, earningsRate)
+  response = xero_client.accounting_api.create_earnings_rate(xero_tenant_id, earningsRate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_earnings_rate: #{e}"
@@ -4177,6 +4241,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEarningsRate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4245,6 +4329,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 address = { 
@@ -4262,7 +4347,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee)
+  response = xero_client.accounting_api.create_employee(xero_tenant_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee: #{e}"
@@ -4307,6 +4392,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4376,6 +4481,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -4389,7 +4495,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.create_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate)
+  response = xero_client.accounting_api.create_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_earnings_template: #{e}"
@@ -4467,6 +4573,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4535,6 +4661,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -4545,7 +4672,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_leave(xero_tenant_id, employee_id, employeeLeave)
+  response = xero_client.accounting_api.create_employee_leave(xero_tenant_id, employee_id, employeeLeave, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_leave: #{e}"
@@ -4623,6 +4750,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeLeave_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4692,6 +4839,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 employee_leave_type = { 
   leave_type_id: "00000000-0000-0000-0000-000000000000",
@@ -4700,7 +4848,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_leave_type(xero_tenant_id, employee_id, employeeLeaveType)
+  response = xero_client.accounting_api.create_employee_leave_type(xero_tenant_id, employee_id, employeeLeaveType, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_leave_type: #{e}"
@@ -4778,6 +4926,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeLeaveType_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4847,6 +5015,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 employee_opening_balances = { 
   statutory_maternity_pay: 0.0,
@@ -4857,7 +5026,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalances)
+  response = xero_client.accounting_api.create_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalances, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_opening_balances: #{e}"
@@ -4935,6 +5104,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeOpeningBalances_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5004,6 +5193,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 bank_account = { 
   account_name: "Charlotte Danes",
@@ -5018,7 +5208,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_payment_method(xero_tenant_id, employee_id, paymentMethod)
+  response = xero_client.accounting_api.create_employee_payment_method(xero_tenant_id, employee_id, paymentMethod, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_payment_method: #{e}"
@@ -5096,6 +5286,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeePaymentMethod_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5165,6 +5375,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 salary_and_wage = { 
   earnings_rate_id: "00000000-0000-0000-0000-000000000000",
@@ -5175,7 +5386,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_salary_and_wage(xero_tenant_id, employee_id, salaryAndWage)
+  response = xero_client.accounting_api.create_employee_salary_and_wage(xero_tenant_id, employee_id, salaryAndWage, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_salary_and_wage: #{e}"
@@ -5253,6 +5464,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeSalaryAndWage_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5321,6 +5552,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -5332,7 +5564,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employee_statutory_sick_leave(xero_tenant_id, employeeStatutorySickLeave)
+  response = xero_client.accounting_api.create_employee_statutory_sick_leave(xero_tenant_id, employeeStatutorySickLeave, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employee_statutory_sick_leave: #{e}"
@@ -5377,6 +5609,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployeeStatutorySickLeave_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5446,6 +5698,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 
 employment = { 
@@ -5454,7 +5707,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_employment(xero_tenant_id, employee_id, employment)
+  response = xero_client.accounting_api.create_employment(xero_tenant_id, employee_id, employment, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_employment: #{e}"
@@ -5532,6 +5785,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createEmployment_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5600,6 +5873,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 leave_type = { 
   name: "LeaveType",
@@ -5608,7 +5882,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_leave_type(xero_tenant_id, leaveType)
+  response = xero_client.accounting_api.create_leave_type(xero_tenant_id, leaveType, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_leave_type: #{e}"
@@ -5653,6 +5927,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createLeaveType_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5722,6 +6016,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -5735,7 +6030,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate)
+  response = xero_client.accounting_api.create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_multiple_employee_earnings_template: #{e}"
@@ -5813,6 +6108,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createMultipleEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -5881,6 +6196,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 payment_date = 'YYYY-MM-DD'
 
@@ -5891,7 +6207,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_pay_run_calendar(xero_tenant_id, payRunCalendar)
+  response = xero_client.accounting_api.create_pay_run_calendar(xero_tenant_id, payRunCalendar, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_pay_run_calendar: #{e}"
@@ -5936,6 +6252,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createPayRunCalendar_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6004,6 +6340,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 reimbursement = { 
   name: "Test Reimbursement",
@@ -6011,7 +6348,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_reimbursement(xero_tenant_id, reimbursement)
+  response = xero_client.accounting_api.create_reimbursement(xero_tenant_id, reimbursement, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_reimbursement: #{e}"
@@ -6056,6 +6393,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createReimbursement_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6124,6 +6481,7 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -6135,7 +6493,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet)
+  response = xero_client.accounting_api.create_timesheet(xero_tenant_id, timesheet, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_timesheet: #{e}"
@@ -6180,6 +6538,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -6249,6 +6627,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 date = 'YYYY-MM-DD'
 
 timesheet_line = { 
@@ -6260,7 +6639,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.create_timesheet_line(xero_tenant_id, timesheet_id, timesheetLine)
+  response = xero_client.accounting_api.create_timesheet_line(xero_tenant_id, timesheet_id, timesheetLine, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_timesheet_line: #{e}"
@@ -6338,6 +6717,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimesheetLine_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11842,9 +12241,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.revert_timesheet(xero_tenant_id, timesheet_id)
+  response = xero_client.accounting_api.revert_timesheet(xero_tenant_id, timesheet_id, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling revert_timesheet: #{e}"
@@ -11922,6 +12322,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_revertTimesheet_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -11955,6 +12375,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 date_of_birth = 'YYYY-MM-DD'
 
 address = { 
@@ -11972,7 +12393,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee)
+  response = xero_client.accounting_api.update_employee(xero_tenant_id, employee_id, employee, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee: #{e}"
@@ -12050,6 +12471,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployee_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12120,6 +12561,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 pay_template_earning_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+idempotency_key = 'KEY_VALUE'
 
 earnings_template = { 
   pay_template_earning_id: "00000000-0000-0000-0000-000000000000",
@@ -12133,7 +12575,7 @@ <h3>Usage and SDK Samples</h3>
 earnings_templates << earnings_template
 
 begin
-  response = xero_client.accounting_api.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earningsTemplate)
+  response = xero_client.accounting_api.update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earningsTemplate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_earnings_template: #{e}"
@@ -12237,6 +12679,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeEarningsTemplate_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12307,6 +12769,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 leave_id = 'c4be24e5-e840-4c92-9eaa-2d86cd596314'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 end_date = 'YYYY-MM-DD'
 
@@ -12317,7 +12780,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_leave(xero_tenant_id, employee_id, leave_id, employeeLeave)
+  response = xero_client.accounting_api.update_employee_leave(xero_tenant_id, employee_id, leave_id, employeeLeave, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_leave: #{e}"
@@ -12421,6 +12884,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeLeave_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12490,6 +12973,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
+idempotency_key = 'KEY_VALUE'
 
 employee_opening_balances = { 
   statutory_maternity_pay: 0.0,
@@ -12500,7 +12984,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalances)
+  response = xero_client.accounting_api.update_employee_opening_balances(xero_tenant_id, employee_id, employeeOpeningBalances, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_opening_balances: #{e}"
@@ -12578,6 +13062,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeOpeningBalances_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12648,6 +13152,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 employee_id = '4ff1e5cc-9835-40d5-bb18-09fdb118db9c'
 salary_and_wages_id = '3fa85f64-5717-4562-b3fc-2c963f66afa6'
+idempotency_key = 'KEY_VALUE'
 
 salary_and_wage = { 
   earnings_rate_id: "00000000-0000-0000-0000-000000000000",
@@ -12658,7 +13163,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salaryAndWage)
+  response = xero_client.accounting_api.update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salaryAndWage, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_employee_salary_and_wage: #{e}"
@@ -12762,6 +13267,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateEmployeeSalaryAndWage_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12831,6 +13356,7 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 pay_run_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 start_date = 'YYYY-MM-DD'
 payment_date = 'YYYY-MM-DD'
 
@@ -12841,7 +13367,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun)
+  response = xero_client.accounting_api.update_pay_run(xero_tenant_id, pay_run_id, payRun, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_pay_run: #{e}"
@@ -12919,6 +13445,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updatePayRun_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -12989,6 +13535,7 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 timesheet_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
 timesheet_line_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 date = 'YYYY-MM-DD'
 
 timesheet_line = { 
@@ -13000,7 +13547,7 @@ <h3>Usage and SDK Samples</h3>
 }  
 
 begin
-  response = xero_client.accounting_api.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheetLine)
+  response = xero_client.accounting_api.update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheetLine, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_timesheet_line: #{e}"
@@ -13104,6 +13651,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTimesheetLine_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/docs/projects/ProjectApi.md b/docs/projects/ProjectApi.md
index 78f94ed4..65b43735 100644
--- a/docs/projects/ProjectApi.md
+++ b/docs/projects/ProjectApi.md
@@ -25,7 +25,7 @@ Method | HTTP request | Description
 
 ## create_project
 
-> Project create_project(xero_tenant_id, project_create_or_update)
+> Project create_project(xero_tenant_id, project_create_or_update, opts)
 
 Create one or more new projects
 
@@ -56,9 +56,13 @@ api_instance = xero_client.<api_set>
 
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_create_or_update = { "contactId": "00000000-0000-0000-000-000000000000", "name": "New Kitchen", "deadlineUtc": "2019-12-10T12:59:59Z", "estimateAmount": "99.99" } # ProjectCreateOrUpdate | Create a new project with ProjectCreateOrUpdate object
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Create one or more new projects
-  result = api_instance.create_project(xero_tenant_id, project_create_or_update)
+  result = api_instance.create_project(xero_tenant_id, project_create_or_update, opts)
   p result
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->create_project: #{e}"
@@ -72,6 +76,7 @@ Name | Type | Description  | Notes
 ------------- | ------------- | ------------- | -------------
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **project_create_or_update** | [**ProjectCreateOrUpdate**](ProjectCreateOrUpdate.md)| Create a new project with ProjectCreateOrUpdate object | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -89,7 +94,7 @@ Name | Type | Description  | Notes
 
 ## create_task
 
-> Task create_task(xero_tenant_id, project_id, task_create_or_update)
+> Task create_task(xero_tenant_id, project_id, task_create_or_update, opts)
 
 Allows you to create a task
 
@@ -123,9 +128,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can create a task on a specified projectId
 task_create_or_update = { "status": "INPROGRESS" } # TaskCreateOrUpdate | The task object you are creating
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Allows you to create a task
-  result = api_instance.create_task(xero_tenant_id, project_id, task_create_or_update)
+  result = api_instance.create_task(xero_tenant_id, project_id, task_create_or_update, opts)
   p result
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->create_task: #{e}"
@@ -140,6 +149,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **project_id** | [**String**](.md)| You can create a task on a specified projectId | 
  **task_create_or_update** | [**TaskCreateOrUpdate**](TaskCreateOrUpdate.md)| The task object you are creating | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -157,7 +167,7 @@ Name | Type | Description  | Notes
 
 ## create_time_entry
 
-> TimeEntry create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update)
+> TimeEntry create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update, opts)
 
 Creates a time entry for a specific project
 
@@ -191,9 +201,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can specify an individual project by appending the projectId to the endpoint
 time_entry_create_or_update = { "userId": "00000000-0000-0000-0000-000000000000", "taskId": "00000000-0000-0000-0000-000000000000", "dateUtc": "2020-02-26T15:00:00Z", "duration":30, "description": "My description" } # TimeEntryCreateOrUpdate | The time entry object you are creating
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Creates a time entry for a specific project
-  result = api_instance.create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update)
+  result = api_instance.create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update, opts)
   p result
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->create_time_entry: #{e}"
@@ -208,6 +222,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **project_id** | [**String**](.md)| You can specify an individual project by appending the projectId to the endpoint | 
  **time_entry_create_or_update** | [**TimeEntryCreateOrUpdate**](TimeEntryCreateOrUpdate.md)| The time entry object you are creating | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -892,7 +907,7 @@ Name | Type | Description  | Notes
 
 ## patch_project
 
-> patch_project(xero_tenant_id, project_id, project_patch)
+> patch_project(xero_tenant_id, project_id, project_patch, opts)
 
 creates a project for the specified contact
 
@@ -926,9 +941,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can specify an individual project by appending the projectId to the endpoint
 project_patch = { "status": "INPROGRESS" } # ProjectPatch | Update the status of an existing Project
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #creates a project for the specified contact
-  api_instance.patch_project(xero_tenant_id, project_id, project_patch)
+  api_instance.patch_project(xero_tenant_id, project_id, project_patch, opts)
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->patch_project: #{e}"
 end
@@ -942,6 +961,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **project_id** | [**String**](.md)| You can specify an individual project by appending the projectId to the endpoint | 
  **project_patch** | [**ProjectPatch**](ProjectPatch.md)| Update the status of an existing Project | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -959,7 +979,7 @@ nil (empty response body)
 
 ## update_project
 
-> update_project(xero_tenant_id, project_id, project_create_or_update)
+> update_project(xero_tenant_id, project_id, project_create_or_update, opts)
 
 Updates a specific project
 
@@ -993,9 +1013,13 @@ api_instance = xero_client.<api_set>
 xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can specify an individual project by appending the projectId to the endpoint
 project_create_or_update = { "name": "New Kitchen", "deadlineUtc": "2017-04-23T18:25:43.511Z", "estimateAmount": 99.99 } # ProjectCreateOrUpdate | Request of type ProjectCreateOrUpdate
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a specific project
-  api_instance.update_project(xero_tenant_id, project_id, project_create_or_update)
+  api_instance.update_project(xero_tenant_id, project_id, project_create_or_update, opts)
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->update_project: #{e}"
 end
@@ -1009,6 +1033,7 @@ Name | Type | Description  | Notes
  **xero_tenant_id** | **String**| Xero identifier for Tenant | 
  **project_id** | [**String**](.md)| You can specify an individual project by appending the projectId to the endpoint | 
  **project_create_or_update** | [**ProjectCreateOrUpdate**](ProjectCreateOrUpdate.md)| Request of type ProjectCreateOrUpdate | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1026,7 +1051,7 @@ nil (empty response body)
 
 ## update_task
 
-> update_task(xero_tenant_id, project_id, task_id, task_create_or_update)
+> update_task(xero_tenant_id, project_id, task_id, task_create_or_update, opts)
 
 Allows you to update a task
 
@@ -1061,9 +1086,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can specify an individual project by appending the projectId to the endpoint
 task_id = 'task_id_example' # String | You can specify an individual task by appending the id to the endpoint
 task_create_or_update = XeroRuby::Projects::TaskCreateOrUpdate.new # TaskCreateOrUpdate | The task object you are updating
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Allows you to update a task
-  api_instance.update_task(xero_tenant_id, project_id, task_id, task_create_or_update)
+  api_instance.update_task(xero_tenant_id, project_id, task_id, task_create_or_update, opts)
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->update_task: #{e}"
 end
@@ -1078,6 +1107,7 @@ Name | Type | Description  | Notes
  **project_id** | [**String**](.md)| You can specify an individual project by appending the projectId to the endpoint | 
  **task_id** | [**String**](.md)| You can specify an individual task by appending the id to the endpoint | 
  **task_create_or_update** | [**TaskCreateOrUpdate**](TaskCreateOrUpdate.md)| The task object you are updating | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
@@ -1095,7 +1125,7 @@ nil (empty response body)
 
 ## update_time_entry
 
-> update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update)
+> update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update, opts)
 
 Updates a time entry for a specific project
 
@@ -1130,9 +1160,13 @@ xero_tenant_id = 'xero_tenant_id_example' # String | Xero identifier for Tenant
 project_id = 'project_id_example' # String | You can specify an individual project by appending the projectId to the endpoint
 time_entry_id = 'time_entry_id_example' # String | You can specify an individual time entry by appending the id to the endpoint
 time_entry_create_or_update = { "userId": "00000000-0000-0000-0000-000000000000", "taskId": "00000000-0000-0000-0000-000000000000", "dateUtc": "2020-02-27T15:00:00Z", "duration":45, "description": "My UPDATED description" } # TimeEntryCreateOrUpdate | The time entry object you are updating
+opts = {
+  idempotency_key: 'KEY_VALUE' # String | This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+}
+
 begin
   #Updates a time entry for a specific project
-  api_instance.update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update)
+  api_instance.update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update, opts)
 rescue XeroRuby::Projects::ApiError => e
   puts "Exception when calling ProjectApi->update_time_entry: #{e}"
 end
@@ -1147,6 +1181,7 @@ Name | Type | Description  | Notes
  **project_id** | [**String**](.md)| You can specify an individual project by appending the projectId to the endpoint | 
  **time_entry_id** | [**String**](.md)| You can specify an individual time entry by appending the id to the endpoint | 
  **time_entry_create_or_update** | [**TimeEntryCreateOrUpdate**](TimeEntryCreateOrUpdate.md)| The time entry object you are updating | 
+ **idempotency_key** | **String**| This allows you to safely retry requests without the risk of duplicate processing. 128 character max. | [optional] 
 
 ### Return type
 
diff --git a/docs/projects/index.html b/docs/projects/index.html
index 83a85ee8..79675b5a 100644
--- a/docs/projects/index.html
+++ b/docs/projects/index.html
@@ -889,7 +889,7 @@
   "type" : "string",
   "description" : "3 letter alpha code for the ISO-4217 currency code, e.g. USD, AUD.",
   "example" : "AUD",
-  "enum" : [ "AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTN", "BWP", "BYN", "BZD", "CAD", "CDF", "CHF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GGP", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "IMP", "INR", "IQD", "IRR", "ISK", "JEP", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRU", "MUR", "MVR", "MWK", "MXN", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SLL", "SOS", "SPL", "SRD", "STN", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TVD", "TWD", "TZS", "UAH", "UGX", "USD", "UYU", "UZS", "VEF", "VND", "VUV", "WST", "XAF", "XCD", "XDR", "XOF", "XPF", "YER", "ZAR", "ZMW", "ZMK", "ZWD", "" ]
+  "enum" : [ "AED", "AFN", "ALL", "AMD", "ANG", "AOA", "ARS", "AUD", "AWG", "AZN", "BAM", "BBD", "BDT", "BGN", "BHD", "BIF", "BMD", "BND", "BOB", "BRL", "BSD", "BTN", "BWP", "BYN", "BZD", "CAD", "CDF", "CHF", "CLP", "CNY", "COP", "CRC", "CUC", "CUP", "CVE", "CZK", "DJF", "DKK", "DOP", "DZD", "EGP", "ERN", "ETB", "EUR", "FJD", "FKP", "GBP", "GEL", "GGP", "GHS", "GIP", "GMD", "GNF", "GTQ", "GYD", "HKD", "HNL", "HRK", "HTG", "HUF", "IDR", "ILS", "IMP", "INR", "IQD", "IRR", "ISK", "JEP", "JMD", "JOD", "JPY", "KES", "KGS", "KHR", "KMF", "KPW", "KRW", "KWD", "KYD", "KZT", "LAK", "LBP", "LKR", "LRD", "LSL", "LYD", "MAD", "MDL", "MGA", "MKD", "MMK", "MNT", "MOP", "MRU", "MUR", "MVR", "MWK", "MXN", "MYR", "MZN", "NAD", "NGN", "NIO", "NOK", "NPR", "NZD", "OMR", "PAB", "PEN", "PGK", "PHP", "PKR", "PLN", "PYG", "QAR", "RON", "RSD", "RUB", "RWF", "SAR", "SBD", "SCR", "SDG", "SEK", "SGD", "SHP", "SLL", "SOS", "SPL", "SRD", "STN", "SVC", "SYP", "SZL", "THB", "TJS", "TMT", "TND", "TOP", "TRY", "TTD", "TVD", "TWD", "TZS", "UAH", "UGX", "USD", "UYU", "UZS", "VEF", "VND", "VUV", "WST", "XAF", "XCD", "XDR", "XOF", "XPF", "YER", "ZAR", "ZMW", "ZMK", "ZWD" ]
 };
       defs["Error"] = {
   "title" : "",
@@ -1462,7 +1462,7 @@
           <nav id="scrollingNav">
             <ul class="sidenav nav nav-list">
               <li class="nav-header" data-group="Project"><strong>SDK: </strong><span id='sdk-name'></span></li>
-              <li class="nav-header" data-group="Project"><strong>VSN: </strong>4.3.0</li>
+              <li class="nav-header" data-group="Project"><strong>VSN: </strong>5.0.0</li>
               <li class="nav-header" data-group="Project"><a href="#api-Project">Methods</a></li>
               <li data-group="Project" data-name="createProject" class="">
                 <a href="#api-Project-createProject">createProject</a>
@@ -1556,9 +1556,10 @@ <h3>Usage and SDK Samples</h3>
                       <pre class="prettyprint"><code class="language-ruby">xero_client.set_token_set(user.token_set)
 
 xero_tenant_id = 'xeroTenantId_example'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_project(xero_tenant_id, projectCreateOrUpdate)
+  response = xero_client.accounting_api.create_project(xero_tenant_id, projectCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_project: #{e}"
@@ -1603,6 +1604,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createProject_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1673,9 +1694,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_task(xero_tenant_id, project_id, taskCreateOrUpdate)
+  response = xero_client.accounting_api.create_task(xero_tenant_id, project_id, taskCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_task: #{e}"
@@ -1753,6 +1775,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTask_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -1823,9 +1865,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.create_time_entry(xero_tenant_id, project_id, timeEntryCreateOrUpdate)
+  response = xero_client.accounting_api.create_time_entry(xero_tenant_id, project_id, timeEntryCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling create_time_entry: #{e}"
@@ -1903,6 +1946,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_createTimeEntry_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3558,9 +3621,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.patch_project(xero_tenant_id, project_id, projectPatch)
+  response = xero_client.accounting_api.patch_project(xero_tenant_id, project_id, projectPatch, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling patch_project: #{e}"
@@ -3638,6 +3702,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_patchProject_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3708,9 +3792,10 @@ <h3>Usage and SDK Samples</h3>
 
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_project(xero_tenant_id, project_id, projectCreateOrUpdate)
+  response = xero_client.accounting_api.update_project(xero_tenant_id, project_id, projectCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_project: #{e}"
@@ -3788,6 +3873,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateProject_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -3859,9 +3964,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
 task_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_task(xero_tenant_id, project_id, task_id, taskCreateOrUpdate)
+  response = xero_client.accounting_api.update_task(xero_tenant_id, project_id, task_id, taskCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_task: #{e}"
@@ -3965,6 +4071,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTask_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
@@ -4035,9 +4161,10 @@ <h3>Usage and SDK Samples</h3>
 xero_tenant_id = 'xeroTenantId_example'
 project_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
 time_entry_id = '38400000-8cf0-11bd-b23e-10b96e4ef00d'
+idempotency_key = 'KEY_VALUE'
 
 begin
-  response = xero_client.accounting_api.update_time_entry(xero_tenant_id, project_id, time_entry_id, timeEntryCreateOrUpdate)
+  response = xero_client.accounting_api.update_time_entry(xero_tenant_id, project_id, time_entry_id, timeEntryCreateOrUpdate, idempotency_key)
   return response
 rescue XeroRuby::ApiError => e
   puts "Exception when calling update_time_entry: #{e}"
@@ -4141,6 +4268,26 @@ <h2>Parameters</h2>
         </div>
     </div>
 </td>
+</tr>
+
+                    <tr><td style="width:150px;">Idempotency-Key</td>
+<td>
+
+
+    <div id="d2e199_updateTimeEntry_idempotencyKey">
+        <div class="json-schema-view">
+            <div class="primitive">
+                <span class="type">
+                    String
+                </span>
+
+                    <div class="inner description marked">
+This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
+                    </div>
+            </div>
+        </div>
+    </div>
+</td>
 </tr>
 
                   </table>
diff --git a/lib/xero-ruby/api/accounting_api.rb b/lib/xero-ruby/api/accounting_api.rb
index 8efce419..523b41a4 100644
--- a/lib/xero-ruby/api/accounting_api.rb
+++ b/lib/xero-ruby/api/accounting_api.rb
@@ -20,6 +20,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param account [Account] Account object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Accounts]
     def create_account(xero_tenant_id, account, opts = {})
       data, _status_code, _headers = create_account_with_http_info(xero_tenant_id, account, opts)
@@ -30,6 +31,7 @@ def create_account(xero_tenant_id, account, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param account [Account] Account object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Accounts, Integer, Hash)>] Accounts data, response status code and response headers
     def create_account_with_http_info(xero_tenant_id, account, options = {})
       opts = options.dup
@@ -64,6 +66,7 @@ def create_account_with_http_info(xero_tenant_id, account, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -99,6 +102,7 @@ def create_account_with_http_info(xero_tenant_id, account, options = {})
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts = {})
       data, _status_code, _headers = create_account_attachment_by_file_name_with_http_info(xero_tenant_id, account_id, file_name, body, opts)
@@ -111,6 +115,7 @@ def create_account_attachment_by_file_name(xero_tenant_id, account_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_account_attachment_by_file_name_with_http_info(xero_tenant_id, account_id, file_name, body, options = {})
       opts = options.dup
@@ -153,6 +158,7 @@ def create_account_attachment_by_file_name_with_http_info(xero_tenant_id, accoun
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -188,6 +194,7 @@ def create_account_attachment_by_file_name_with_http_info(xero_tenant_id, accoun
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts = {})
       data, _status_code, _headers = create_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transaction_id, file_name, body, opts)
@@ -200,6 +207,7 @@ def create_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transac
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transaction_id, file_name, body, options = {})
       opts = options.dup
@@ -242,6 +250,7 @@ def create_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_i
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -276,6 +285,7 @@ def create_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_i
     # @param bank_transaction_id [String] Xero generated unique identifier for a bank transaction
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id, history_records, opts = {})
       data, _status_code, _headers = create_bank_transaction_history_record_with_http_info(xero_tenant_id, bank_transaction_id, history_records, opts)
@@ -287,6 +297,7 @@ def create_bank_transaction_history_record(xero_tenant_id, bank_transaction_id,
     # @param bank_transaction_id [String] Xero generated unique identifier for a bank transaction
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_bank_transaction_history_record_with_http_info(xero_tenant_id, bank_transaction_id, history_records, options = {})
       opts = options.dup
@@ -325,6 +336,7 @@ def create_bank_transaction_history_record_with_http_info(xero_tenant_id, bank_t
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -360,6 +372,7 @@ def create_bank_transaction_history_record_with_http_info(xero_tenant_id, bank_t
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BankTransactions]
     def create_bank_transactions(xero_tenant_id, bank_transactions, opts = {})
       data, _status_code, _headers = create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, opts)
@@ -372,6 +385,7 @@ def create_bank_transactions(xero_tenant_id, bank_transactions, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BankTransactions, Integer, Hash)>] BankTransactions data, response status code and response headers
     def create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, options = {})
       opts = options.dup
@@ -408,6 +422,7 @@ def create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, o
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -441,6 +456,7 @@ def create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, o
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param bank_transfers [BankTransfers] BankTransfers with array of BankTransfer objects in request body
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BankTransfers]
     def create_bank_transfer(xero_tenant_id, bank_transfers, opts = {})
       data, _status_code, _headers = create_bank_transfer_with_http_info(xero_tenant_id, bank_transfers, opts)
@@ -451,6 +467,7 @@ def create_bank_transfer(xero_tenant_id, bank_transfers, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param bank_transfers [BankTransfers] BankTransfers with array of BankTransfer objects in request body
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BankTransfers, Integer, Hash)>] BankTransfers data, response status code and response headers
     def create_bank_transfer_with_http_info(xero_tenant_id, bank_transfers, options = {})
       opts = options.dup
@@ -485,6 +502,7 @@ def create_bank_transfer_with_http_info(xero_tenant_id, bank_transfers, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -519,6 +537,7 @@ def create_bank_transfer_with_http_info(xero_tenant_id, bank_transfers, options
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts = {})
       data, _status_code, _headers = create_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transfer_id, file_name, body, opts)
@@ -530,6 +549,7 @@ def create_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_i
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transfer_id, file_name, body, options = {})
       opts = options.dup
@@ -572,6 +592,7 @@ def create_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -606,6 +627,7 @@ def create_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param bank_transfer_id [String] Xero generated unique identifier for a bank transfer
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, history_records, opts = {})
       data, _status_code, _headers = create_bank_transfer_history_record_with_http_info(xero_tenant_id, bank_transfer_id, history_records, opts)
@@ -617,6 +639,7 @@ def create_bank_transfer_history_record(xero_tenant_id, bank_transfer_id, histor
     # @param bank_transfer_id [String] Xero generated unique identifier for a bank transfer
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_bank_transfer_history_record_with_http_info(xero_tenant_id, bank_transfer_id, history_records, options = {})
       opts = options.dup
@@ -655,6 +678,7 @@ def create_bank_transfer_history_record_with_http_info(xero_tenant_id, bank_tran
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -689,6 +713,7 @@ def create_bank_transfer_history_record_with_http_info(xero_tenant_id, bank_tran
     # @param batch_payments [BatchPayments] BatchPayments with an array of Payments in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BatchPayments]
     def create_batch_payment(xero_tenant_id, batch_payments, opts = {})
       data, _status_code, _headers = create_batch_payment_with_http_info(xero_tenant_id, batch_payments, opts)
@@ -700,6 +725,7 @@ def create_batch_payment(xero_tenant_id, batch_payments, opts = {})
     # @param batch_payments [BatchPayments] BatchPayments with an array of Payments in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BatchPayments, Integer, Hash)>] BatchPayments data, response status code and response headers
     def create_batch_payment_with_http_info(xero_tenant_id, batch_payments, options = {})
       opts = options.dup
@@ -735,6 +761,7 @@ def create_batch_payment_with_http_info(xero_tenant_id, batch_payments, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -769,6 +796,7 @@ def create_batch_payment_with_http_info(xero_tenant_id, batch_payments, options
     # @param batch_payment_id [String] Unique identifier for BatchPayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_batch_payment_history_record(xero_tenant_id, batch_payment_id, history_records, opts = {})
       data, _status_code, _headers = create_batch_payment_history_record_with_http_info(xero_tenant_id, batch_payment_id, history_records, opts)
@@ -780,6 +808,7 @@ def create_batch_payment_history_record(xero_tenant_id, batch_payment_id, histor
     # @param batch_payment_id [String] Unique identifier for BatchPayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_batch_payment_history_record_with_http_info(xero_tenant_id, batch_payment_id, history_records, options = {})
       opts = options.dup
@@ -818,6 +847,7 @@ def create_batch_payment_history_record_with_http_info(xero_tenant_id, batch_pay
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -852,6 +882,7 @@ def create_batch_payment_history_record_with_http_info(xero_tenant_id, batch_pay
     # @param branding_theme_id [String] Unique identifier for a Branding Theme
     # @param payment_services [PaymentServices] PaymentServices array with PaymentService object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PaymentServices]
     def create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, payment_services, opts = {})
       data, _status_code, _headers = create_branding_theme_payment_services_with_http_info(xero_tenant_id, branding_theme_id, payment_services, opts)
@@ -863,6 +894,7 @@ def create_branding_theme_payment_services(xero_tenant_id, branding_theme_id, pa
     # @param branding_theme_id [String] Unique identifier for a Branding Theme
     # @param payment_services [PaymentServices] PaymentServices array with PaymentService object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PaymentServices, Integer, Hash)>] PaymentServices data, response status code and response headers
     def create_branding_theme_payment_services_with_http_info(xero_tenant_id, branding_theme_id, payment_services, options = {})
       opts = options.dup
@@ -901,6 +933,7 @@ def create_branding_theme_payment_services_with_http_info(xero_tenant_id, brandi
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -935,6 +968,7 @@ def create_branding_theme_payment_services_with_http_info(xero_tenant_id, brandi
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts = {})
       data, _status_code, _headers = create_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contact_id, file_name, body, opts)
@@ -946,6 +980,7 @@ def create_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contact_id, file_name, body, options = {})
       opts = options.dup
@@ -988,6 +1023,7 @@ def create_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contac
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1021,6 +1057,7 @@ def create_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contac
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param contact_groups [ContactGroups] ContactGroups with an array of names in request body
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ContactGroups]
     def create_contact_group(xero_tenant_id, contact_groups, opts = {})
       data, _status_code, _headers = create_contact_group_with_http_info(xero_tenant_id, contact_groups, opts)
@@ -1031,6 +1068,7 @@ def create_contact_group(xero_tenant_id, contact_groups, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param contact_groups [ContactGroups] ContactGroups with an array of names in request body
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ContactGroups, Integer, Hash)>] ContactGroups data, response status code and response headers
     def create_contact_group_with_http_info(xero_tenant_id, contact_groups, options = {})
       opts = options.dup
@@ -1065,6 +1103,7 @@ def create_contact_group_with_http_info(xero_tenant_id, contact_groups, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1099,6 +1138,7 @@ def create_contact_group_with_http_info(xero_tenant_id, contact_groups, options
     # @param contact_group_id [String] Unique identifier for a Contact Group
     # @param contacts [Contacts] Contacts with array of contacts specifying the ContactID to be added to ContactGroup in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Contacts]
     def create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts, opts = {})
       data, _status_code, _headers = create_contact_group_contacts_with_http_info(xero_tenant_id, contact_group_id, contacts, opts)
@@ -1110,6 +1150,7 @@ def create_contact_group_contacts(xero_tenant_id, contact_group_id, contacts, op
     # @param contact_group_id [String] Unique identifier for a Contact Group
     # @param contacts [Contacts] Contacts with array of contacts specifying the ContactID to be added to ContactGroup in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Contacts, Integer, Hash)>] Contacts data, response status code and response headers
     def create_contact_group_contacts_with_http_info(xero_tenant_id, contact_group_id, contacts, options = {})
       opts = options.dup
@@ -1148,6 +1189,7 @@ def create_contact_group_contacts_with_http_info(xero_tenant_id, contact_group_i
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1182,6 +1224,7 @@ def create_contact_group_contacts_with_http_info(xero_tenant_id, contact_group_i
     # @param contact_id [String] Unique identifier for a Contact
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_contact_history(xero_tenant_id, contact_id, history_records, opts = {})
       data, _status_code, _headers = create_contact_history_with_http_info(xero_tenant_id, contact_id, history_records, opts)
@@ -1193,6 +1236,7 @@ def create_contact_history(xero_tenant_id, contact_id, history_records, opts = {
     # @param contact_id [String] Unique identifier for a Contact
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_contact_history_with_http_info(xero_tenant_id, contact_id, history_records, options = {})
       opts = options.dup
@@ -1231,6 +1275,7 @@ def create_contact_history_with_http_info(xero_tenant_id, contact_id, history_re
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1265,6 +1310,7 @@ def create_contact_history_with_http_info(xero_tenant_id, contact_id, history_re
     # @param contacts [Contacts] Contacts with an array of Contact objects to create in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Contacts]
     def create_contacts(xero_tenant_id, contacts, opts = {})
       data, _status_code, _headers = create_contacts_with_http_info(xero_tenant_id, contacts, opts)
@@ -1276,6 +1322,7 @@ def create_contacts(xero_tenant_id, contacts, opts = {})
     # @param contacts [Contacts] Contacts with an array of Contact objects to create in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Contacts, Integer, Hash)>] Contacts data, response status code and response headers
     def create_contacts_with_http_info(xero_tenant_id, contacts, options = {})
       opts = options.dup
@@ -1311,6 +1358,7 @@ def create_contacts_with_http_info(xero_tenant_id, contacts, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1346,6 +1394,7 @@ def create_contacts_with_http_info(xero_tenant_id, contacts, options = {})
     # @param allocations [Allocations] Allocations with array of Allocation object in body of request.
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Allocations]
     def create_credit_note_allocation(xero_tenant_id, credit_note_id, allocations, opts = {})
       data, _status_code, _headers = create_credit_note_allocation_with_http_info(xero_tenant_id, credit_note_id, allocations, opts)
@@ -1358,6 +1407,7 @@ def create_credit_note_allocation(xero_tenant_id, credit_note_id, allocations, o
     # @param allocations [Allocations] Allocations with array of Allocation object in body of request.
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Allocations, Integer, Hash)>] Allocations data, response status code and response headers
     def create_credit_note_allocation_with_http_info(xero_tenant_id, credit_note_id, allocations, options = {})
       opts = options.dup
@@ -1397,6 +1447,7 @@ def create_credit_note_allocation_with_http_info(xero_tenant_id, credit_note_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1433,6 +1484,7 @@ def create_credit_note_allocation_with_http_info(xero_tenant_id, credit_note_id,
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :include_online Allows an attachment to be seen by the end customer within their online invoice (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, opts = {})
       data, _status_code, _headers = create_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, credit_note_id, file_name, body, opts)
@@ -1446,6 +1498,7 @@ def create_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, f
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :include_online Allows an attachment to be seen by the end customer within their online invoice
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, credit_note_id, file_name, body, options = {})
       opts = options.dup
@@ -1489,6 +1542,7 @@ def create_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, cr
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1523,6 +1577,7 @@ def create_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, cr
     # @param credit_note_id [String] Unique identifier for a Credit Note
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_credit_note_history(xero_tenant_id, credit_note_id, history_records, opts = {})
       data, _status_code, _headers = create_credit_note_history_with_http_info(xero_tenant_id, credit_note_id, history_records, opts)
@@ -1534,6 +1589,7 @@ def create_credit_note_history(xero_tenant_id, credit_note_id, history_records,
     # @param credit_note_id [String] Unique identifier for a Credit Note
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_credit_note_history_with_http_info(xero_tenant_id, credit_note_id, history_records, options = {})
       opts = options.dup
@@ -1572,6 +1628,7 @@ def create_credit_note_history_with_http_info(xero_tenant_id, credit_note_id, hi
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1607,6 +1664,7 @@ def create_credit_note_history_with_http_info(xero_tenant_id, credit_note_id, hi
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [CreditNotes]
     def create_credit_notes(xero_tenant_id, credit_notes, opts = {})
       data, _status_code, _headers = create_credit_notes_with_http_info(xero_tenant_id, credit_notes, opts)
@@ -1619,6 +1677,7 @@ def create_credit_notes(xero_tenant_id, credit_notes, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(CreditNotes, Integer, Hash)>] CreditNotes data, response status code and response headers
     def create_credit_notes_with_http_info(xero_tenant_id, credit_notes, options = {})
       opts = options.dup
@@ -1655,6 +1714,7 @@ def create_credit_notes_with_http_info(xero_tenant_id, credit_notes, options = {
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1688,6 +1748,7 @@ def create_credit_notes_with_http_info(xero_tenant_id, credit_notes, options = {
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param currency [Currency] Currency object in the body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Currencies]
     def create_currency(xero_tenant_id, currency, opts = {})
       data, _status_code, _headers = create_currency_with_http_info(xero_tenant_id, currency, opts)
@@ -1698,6 +1759,7 @@ def create_currency(xero_tenant_id, currency, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param currency [Currency] Currency object in the body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Currencies, Integer, Hash)>] Currencies data, response status code and response headers
     def create_currency_with_http_info(xero_tenant_id, currency, options = {})
       opts = options.dup
@@ -1732,6 +1794,7 @@ def create_currency_with_http_info(xero_tenant_id, currency, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1766,6 +1829,7 @@ def create_currency_with_http_info(xero_tenant_id, currency, options = {})
     # @param employees [Employees] Employees with array of Employee object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Employees]
     def create_employees(xero_tenant_id, employees, opts = {})
       data, _status_code, _headers = create_employees_with_http_info(xero_tenant_id, employees, opts)
@@ -1777,6 +1841,7 @@ def create_employees(xero_tenant_id, employees, opts = {})
     # @param employees [Employees] Employees with array of Employee object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Employees, Integer, Hash)>] Employees data, response status code and response headers
     def create_employees_with_http_info(xero_tenant_id, employees, options = {})
       opts = options.dup
@@ -1812,6 +1877,7 @@ def create_employees_with_http_info(xero_tenant_id, employees, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1846,6 +1912,7 @@ def create_employees_with_http_info(xero_tenant_id, employees, options = {})
     # @param expense_claim_id [String] Unique identifier for a ExpenseClaim
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_expense_claim_history(xero_tenant_id, expense_claim_id, history_records, opts = {})
       data, _status_code, _headers = create_expense_claim_history_with_http_info(xero_tenant_id, expense_claim_id, history_records, opts)
@@ -1857,6 +1924,7 @@ def create_expense_claim_history(xero_tenant_id, expense_claim_id, history_recor
     # @param expense_claim_id [String] Unique identifier for a ExpenseClaim
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_expense_claim_history_with_http_info(xero_tenant_id, expense_claim_id, history_records, options = {})
       opts = options.dup
@@ -1895,6 +1963,7 @@ def create_expense_claim_history_with_http_info(xero_tenant_id, expense_claim_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1928,6 +1997,7 @@ def create_expense_claim_history_with_http_info(xero_tenant_id, expense_claim_id
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param expense_claims [ExpenseClaims] ExpenseClaims with array of ExpenseClaim object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ExpenseClaims]
     def create_expense_claims(xero_tenant_id, expense_claims, opts = {})
       data, _status_code, _headers = create_expense_claims_with_http_info(xero_tenant_id, expense_claims, opts)
@@ -1938,6 +2008,7 @@ def create_expense_claims(xero_tenant_id, expense_claims, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param expense_claims [ExpenseClaims] ExpenseClaims with array of ExpenseClaim object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ExpenseClaims, Integer, Hash)>] ExpenseClaims data, response status code and response headers
     def create_expense_claims_with_http_info(xero_tenant_id, expense_claims, options = {})
       opts = options.dup
@@ -1972,6 +2043,7 @@ def create_expense_claims_with_http_info(xero_tenant_id, expense_claims, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2008,6 +2080,7 @@ def create_expense_claims_with_http_info(xero_tenant_id, expense_claims, options
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :include_online Allows an attachment to be seen by the end customer within their online invoice (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, opts = {})
       data, _status_code, _headers = create_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoice_id, file_name, body, opts)
@@ -2021,6 +2094,7 @@ def create_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :include_online Allows an attachment to be seen by the end customer within their online invoice
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoice_id, file_name, body, options = {})
       opts = options.dup
@@ -2064,6 +2138,7 @@ def create_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoic
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2098,6 +2173,7 @@ def create_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoic
     # @param invoice_id [String] Unique identifier for an Invoice
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_invoice_history(xero_tenant_id, invoice_id, history_records, opts = {})
       data, _status_code, _headers = create_invoice_history_with_http_info(xero_tenant_id, invoice_id, history_records, opts)
@@ -2109,6 +2185,7 @@ def create_invoice_history(xero_tenant_id, invoice_id, history_records, opts = {
     # @param invoice_id [String] Unique identifier for an Invoice
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_invoice_history_with_http_info(xero_tenant_id, invoice_id, history_records, options = {})
       opts = options.dup
@@ -2147,6 +2224,7 @@ def create_invoice_history_with_http_info(xero_tenant_id, invoice_id, history_re
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2182,6 +2260,7 @@ def create_invoice_history_with_http_info(xero_tenant_id, invoice_id, history_re
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Invoices]
     def create_invoices(xero_tenant_id, invoices, opts = {})
       data, _status_code, _headers = create_invoices_with_http_info(xero_tenant_id, invoices, opts)
@@ -2194,6 +2273,7 @@ def create_invoices(xero_tenant_id, invoices, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Invoices, Integer, Hash)>] Invoices data, response status code and response headers
     def create_invoices_with_http_info(xero_tenant_id, invoices, options = {})
       opts = options.dup
@@ -2230,6 +2310,7 @@ def create_invoices_with_http_info(xero_tenant_id, invoices, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2264,6 +2345,7 @@ def create_invoices_with_http_info(xero_tenant_id, invoices, options = {})
     # @param item_id [String] Unique identifier for an Item
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_item_history(xero_tenant_id, item_id, history_records, opts = {})
       data, _status_code, _headers = create_item_history_with_http_info(xero_tenant_id, item_id, history_records, opts)
@@ -2275,6 +2357,7 @@ def create_item_history(xero_tenant_id, item_id, history_records, opts = {})
     # @param item_id [String] Unique identifier for an Item
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_item_history_with_http_info(xero_tenant_id, item_id, history_records, options = {})
       opts = options.dup
@@ -2313,6 +2396,7 @@ def create_item_history_with_http_info(xero_tenant_id, item_id, history_records,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2348,6 +2432,7 @@ def create_item_history_with_http_info(xero_tenant_id, item_id, history_records,
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Items]
     def create_items(xero_tenant_id, items, opts = {})
       data, _status_code, _headers = create_items_with_http_info(xero_tenant_id, items, opts)
@@ -2360,6 +2445,7 @@ def create_items(xero_tenant_id, items, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Items, Integer, Hash)>] Items data, response status code and response headers
     def create_items_with_http_info(xero_tenant_id, items, options = {})
       opts = options.dup
@@ -2396,6 +2482,7 @@ def create_items_with_http_info(xero_tenant_id, items, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2429,6 +2516,7 @@ def create_items_with_http_info(xero_tenant_id, items, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param linked_transaction [LinkedTransaction] LinkedTransaction object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LinkedTransactions]
     def create_linked_transaction(xero_tenant_id, linked_transaction, opts = {})
       data, _status_code, _headers = create_linked_transaction_with_http_info(xero_tenant_id, linked_transaction, opts)
@@ -2439,6 +2527,7 @@ def create_linked_transaction(xero_tenant_id, linked_transaction, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param linked_transaction [LinkedTransaction] LinkedTransaction object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LinkedTransactions, Integer, Hash)>] LinkedTransactions data, response status code and response headers
     def create_linked_transaction_with_http_info(xero_tenant_id, linked_transaction, options = {})
       opts = options.dup
@@ -2473,6 +2562,7 @@ def create_linked_transaction_with_http_info(xero_tenant_id, linked_transaction,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2508,6 +2598,7 @@ def create_linked_transaction_with_http_info(xero_tenant_id, linked_transaction,
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts = {})
       data, _status_code, _headers = create_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id, manual_journal_id, file_name, body, opts)
@@ -2520,6 +2611,7 @@ def create_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id, manual_journal_id, file_name, body, options = {})
       opts = options.dup
@@ -2562,6 +2654,7 @@ def create_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2596,6 +2689,7 @@ def create_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param manual_journal_id [String] Unique identifier for a ManualJournal
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_manual_journal_history_record(xero_tenant_id, manual_journal_id, history_records, opts = {})
       data, _status_code, _headers = create_manual_journal_history_record_with_http_info(xero_tenant_id, manual_journal_id, history_records, opts)
@@ -2607,6 +2701,7 @@ def create_manual_journal_history_record(xero_tenant_id, manual_journal_id, hist
     # @param manual_journal_id [String] Unique identifier for a ManualJournal
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_manual_journal_history_record_with_http_info(xero_tenant_id, manual_journal_id, history_records, options = {})
       opts = options.dup
@@ -2645,6 +2740,7 @@ def create_manual_journal_history_record_with_http_info(xero_tenant_id, manual_j
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2679,6 +2775,7 @@ def create_manual_journal_history_record_with_http_info(xero_tenant_id, manual_j
     # @param manual_journals [ManualJournals] ManualJournals array with ManualJournal object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ManualJournals]
     def create_manual_journals(xero_tenant_id, manual_journals, opts = {})
       data, _status_code, _headers = create_manual_journals_with_http_info(xero_tenant_id, manual_journals, opts)
@@ -2690,6 +2787,7 @@ def create_manual_journals(xero_tenant_id, manual_journals, opts = {})
     # @param manual_journals [ManualJournals] ManualJournals array with ManualJournal object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ManualJournals, Integer, Hash)>] ManualJournals data, response status code and response headers
     def create_manual_journals_with_http_info(xero_tenant_id, manual_journals, options = {})
       opts = options.dup
@@ -2725,6 +2823,7 @@ def create_manual_journals_with_http_info(xero_tenant_id, manual_journals, optio
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2760,6 +2859,7 @@ def create_manual_journals_with_http_info(xero_tenant_id, manual_journals, optio
     # @param allocations [Allocations] Allocations array with Allocation object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Allocations]
     def create_overpayment_allocations(xero_tenant_id, overpayment_id, allocations, opts = {})
       data, _status_code, _headers = create_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id, allocations, opts)
@@ -2772,6 +2872,7 @@ def create_overpayment_allocations(xero_tenant_id, overpayment_id, allocations,
     # @param allocations [Allocations] Allocations array with Allocation object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Allocations, Integer, Hash)>] Allocations data, response status code and response headers
     def create_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id, allocations, options = {})
       opts = options.dup
@@ -2811,6 +2912,7 @@ def create_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2845,6 +2947,7 @@ def create_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id
     # @param overpayment_id [String] Unique identifier for a Overpayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_overpayment_history(xero_tenant_id, overpayment_id, history_records, opts = {})
       data, _status_code, _headers = create_overpayment_history_with_http_info(xero_tenant_id, overpayment_id, history_records, opts)
@@ -2856,6 +2959,7 @@ def create_overpayment_history(xero_tenant_id, overpayment_id, history_records,
     # @param overpayment_id [String] Unique identifier for a Overpayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_overpayment_history_with_http_info(xero_tenant_id, overpayment_id, history_records, options = {})
       opts = options.dup
@@ -2894,6 +2998,7 @@ def create_overpayment_history_with_http_info(xero_tenant_id, overpayment_id, hi
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2927,6 +3032,7 @@ def create_overpayment_history_with_http_info(xero_tenant_id, overpayment_id, hi
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payment [Payment] Request body with a single Payment object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Payments]
     def create_payment(xero_tenant_id, payment, opts = {})
       data, _status_code, _headers = create_payment_with_http_info(xero_tenant_id, payment, opts)
@@ -2937,6 +3043,7 @@ def create_payment(xero_tenant_id, payment, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payment [Payment] Request body with a single Payment object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Payments, Integer, Hash)>] Payments data, response status code and response headers
     def create_payment_with_http_info(xero_tenant_id, payment, options = {})
       opts = options.dup
@@ -2971,6 +3078,7 @@ def create_payment_with_http_info(xero_tenant_id, payment, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3005,6 +3113,7 @@ def create_payment_with_http_info(xero_tenant_id, payment, options = {})
     # @param payment_id [String] Unique identifier for a Payment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_payment_history(xero_tenant_id, payment_id, history_records, opts = {})
       data, _status_code, _headers = create_payment_history_with_http_info(xero_tenant_id, payment_id, history_records, opts)
@@ -3016,6 +3125,7 @@ def create_payment_history(xero_tenant_id, payment_id, history_records, opts = {
     # @param payment_id [String] Unique identifier for a Payment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_payment_history_with_http_info(xero_tenant_id, payment_id, history_records, options = {})
       opts = options.dup
@@ -3054,6 +3164,7 @@ def create_payment_history_with_http_info(xero_tenant_id, payment_id, history_re
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3087,6 +3198,7 @@ def create_payment_history_with_http_info(xero_tenant_id, payment_id, history_re
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payment_services [PaymentServices] PaymentServices array with PaymentService object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PaymentServices]
     def create_payment_service(xero_tenant_id, payment_services, opts = {})
       data, _status_code, _headers = create_payment_service_with_http_info(xero_tenant_id, payment_services, opts)
@@ -3097,6 +3209,7 @@ def create_payment_service(xero_tenant_id, payment_services, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payment_services [PaymentServices] PaymentServices array with PaymentService object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PaymentServices, Integer, Hash)>] PaymentServices data, response status code and response headers
     def create_payment_service_with_http_info(xero_tenant_id, payment_services, options = {})
       opts = options.dup
@@ -3131,6 +3244,7 @@ def create_payment_service_with_http_info(xero_tenant_id, payment_services, opti
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3165,6 +3279,7 @@ def create_payment_service_with_http_info(xero_tenant_id, payment_services, opti
     # @param payments [Payments] Payments array with Payment object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Payments]
     def create_payments(xero_tenant_id, payments, opts = {})
       data, _status_code, _headers = create_payments_with_http_info(xero_tenant_id, payments, opts)
@@ -3176,6 +3291,7 @@ def create_payments(xero_tenant_id, payments, opts = {})
     # @param payments [Payments] Payments array with Payment object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Payments, Integer, Hash)>] Payments data, response status code and response headers
     def create_payments_with_http_info(xero_tenant_id, payments, options = {})
       opts = options.dup
@@ -3211,6 +3327,7 @@ def create_payments_with_http_info(xero_tenant_id, payments, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3246,6 +3363,7 @@ def create_payments_with_http_info(xero_tenant_id, payments, options = {})
     # @param allocations [Allocations] Allocations with an array of Allocation object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Allocations]
     def create_prepayment_allocations(xero_tenant_id, prepayment_id, allocations, opts = {})
       data, _status_code, _headers = create_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id, allocations, opts)
@@ -3258,6 +3376,7 @@ def create_prepayment_allocations(xero_tenant_id, prepayment_id, allocations, op
     # @param allocations [Allocations] Allocations with an array of Allocation object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Allocations, Integer, Hash)>] Allocations data, response status code and response headers
     def create_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id, allocations, options = {})
       opts = options.dup
@@ -3297,6 +3416,7 @@ def create_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3331,6 +3451,7 @@ def create_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id,
     # @param prepayment_id [String] Unique identifier for a PrePayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_prepayment_history(xero_tenant_id, prepayment_id, history_records, opts = {})
       data, _status_code, _headers = create_prepayment_history_with_http_info(xero_tenant_id, prepayment_id, history_records, opts)
@@ -3342,6 +3463,7 @@ def create_prepayment_history(xero_tenant_id, prepayment_id, history_records, op
     # @param prepayment_id [String] Unique identifier for a PrePayment
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_prepayment_history_with_http_info(xero_tenant_id, prepayment_id, history_records, options = {})
       opts = options.dup
@@ -3380,6 +3502,7 @@ def create_prepayment_history_with_http_info(xero_tenant_id, prepayment_id, hist
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3415,6 +3538,7 @@ def create_prepayment_history_with_http_info(xero_tenant_id, prepayment_id, hist
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts = {})
       data, _status_code, _headers = create_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id, purchase_order_id, file_name, body, opts)
@@ -3427,6 +3551,7 @@ def create_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id, purchase_order_id, file_name, body, options = {})
       opts = options.dup
@@ -3469,6 +3594,7 @@ def create_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3503,6 +3629,7 @@ def create_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param purchase_order_id [String] Unique identifier for an Purchase Order
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_purchase_order_history(xero_tenant_id, purchase_order_id, history_records, opts = {})
       data, _status_code, _headers = create_purchase_order_history_with_http_info(xero_tenant_id, purchase_order_id, history_records, opts)
@@ -3514,6 +3641,7 @@ def create_purchase_order_history(xero_tenant_id, purchase_order_id, history_rec
     # @param purchase_order_id [String] Unique identifier for an Purchase Order
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_purchase_order_history_with_http_info(xero_tenant_id, purchase_order_id, history_records, options = {})
       opts = options.dup
@@ -3552,6 +3680,7 @@ def create_purchase_order_history_with_http_info(xero_tenant_id, purchase_order_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3586,6 +3715,7 @@ def create_purchase_order_history_with_http_info(xero_tenant_id, purchase_order_
     # @param purchase_orders [PurchaseOrders] PurchaseOrders with an array of PurchaseOrder object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PurchaseOrders]
     def create_purchase_orders(xero_tenant_id, purchase_orders, opts = {})
       data, _status_code, _headers = create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, opts)
@@ -3597,6 +3727,7 @@ def create_purchase_orders(xero_tenant_id, purchase_orders, opts = {})
     # @param purchase_orders [PurchaseOrders] PurchaseOrders with an array of PurchaseOrder object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PurchaseOrders, Integer, Hash)>] PurchaseOrders data, response status code and response headers
     def create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, options = {})
       opts = options.dup
@@ -3632,6 +3763,7 @@ def create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, optio
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3667,6 +3799,7 @@ def create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, optio
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts = {})
       data, _status_code, _headers = create_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id, file_name, body, opts)
@@ -3679,6 +3812,7 @@ def create_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, bo
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id, file_name, body, options = {})
       opts = options.dup
@@ -3721,6 +3855,7 @@ def create_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3755,6 +3890,7 @@ def create_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id
     # @param quote_id [String] Unique identifier for an Quote
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_quote_history(xero_tenant_id, quote_id, history_records, opts = {})
       data, _status_code, _headers = create_quote_history_with_http_info(xero_tenant_id, quote_id, history_records, opts)
@@ -3766,6 +3902,7 @@ def create_quote_history(xero_tenant_id, quote_id, history_records, opts = {})
     # @param quote_id [String] Unique identifier for an Quote
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_quote_history_with_http_info(xero_tenant_id, quote_id, history_records, options = {})
       opts = options.dup
@@ -3804,6 +3941,7 @@ def create_quote_history_with_http_info(xero_tenant_id, quote_id, history_record
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3838,6 +3976,7 @@ def create_quote_history_with_http_info(xero_tenant_id, quote_id, history_record
     # @param quotes [Quotes] Quotes with an array of Quote object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Quotes]
     def create_quotes(xero_tenant_id, quotes, opts = {})
       data, _status_code, _headers = create_quotes_with_http_info(xero_tenant_id, quotes, opts)
@@ -3849,6 +3988,7 @@ def create_quotes(xero_tenant_id, quotes, opts = {})
     # @param quotes [Quotes] Quotes with an array of Quote object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Quotes, Integer, Hash)>] Quotes data, response status code and response headers
     def create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
       opts = options.dup
@@ -3884,6 +4024,7 @@ def create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3918,6 +4059,7 @@ def create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
     # @param receipts [Receipts] Receipts with an array of Receipt object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Receipts]
     def create_receipt(xero_tenant_id, receipts, opts = {})
       data, _status_code, _headers = create_receipt_with_http_info(xero_tenant_id, receipts, opts)
@@ -3929,6 +4071,7 @@ def create_receipt(xero_tenant_id, receipts, opts = {})
     # @param receipts [Receipts] Receipts with an array of Receipt object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Receipts, Integer, Hash)>] Receipts data, response status code and response headers
     def create_receipt_with_http_info(xero_tenant_id, receipts, options = {})
       opts = options.dup
@@ -3964,6 +4107,7 @@ def create_receipt_with_http_info(xero_tenant_id, receipts, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -3999,6 +4143,7 @@ def create_receipt_with_http_info(xero_tenant_id, receipts, options = {})
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts = {})
       data, _status_code, _headers = create_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receipt_id, file_name, body, opts)
@@ -4011,6 +4156,7 @@ def create_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receipt_id, file_name, body, options = {})
       opts = options.dup
@@ -4053,6 +4199,7 @@ def create_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receip
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4087,6 +4234,7 @@ def create_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receip
     # @param receipt_id [String] Unique identifier for a Receipt
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_receipt_history(xero_tenant_id, receipt_id, history_records, opts = {})
       data, _status_code, _headers = create_receipt_history_with_http_info(xero_tenant_id, receipt_id, history_records, opts)
@@ -4098,6 +4246,7 @@ def create_receipt_history(xero_tenant_id, receipt_id, history_records, opts = {
     # @param receipt_id [String] Unique identifier for a Receipt
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_receipt_history_with_http_info(xero_tenant_id, receipt_id, history_records, options = {})
       opts = options.dup
@@ -4136,6 +4285,7 @@ def create_receipt_history_with_http_info(xero_tenant_id, receipt_id, history_re
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4171,6 +4321,7 @@ def create_receipt_history_with_http_info(xero_tenant_id, receipt_id, history_re
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts = {})
       data, _status_code, _headers = create_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
@@ -4183,6 +4334,7 @@ def create_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_i
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def create_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, repeating_invoice_id, file_name, body, options = {})
       opts = options.dup
@@ -4225,6 +4377,7 @@ def create_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4259,6 +4412,7 @@ def create_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_
     # @param repeating_invoice_id [String] Unique identifier for a Repeating Invoice
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [HistoryRecords]
     def create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, history_records, opts = {})
       data, _status_code, _headers = create_repeating_invoice_history_with_http_info(xero_tenant_id, repeating_invoice_id, history_records, opts)
@@ -4270,6 +4424,7 @@ def create_repeating_invoice_history(xero_tenant_id, repeating_invoice_id, histo
     # @param repeating_invoice_id [String] Unique identifier for a Repeating Invoice
     # @param history_records [HistoryRecords] HistoryRecords containing an array of HistoryRecord objects in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(HistoryRecords, Integer, Hash)>] HistoryRecords data, response status code and response headers
     def create_repeating_invoice_history_with_http_info(xero_tenant_id, repeating_invoice_id, history_records, options = {})
       opts = options.dup
@@ -4308,6 +4463,7 @@ def create_repeating_invoice_history_with_http_info(xero_tenant_id, repeating_in
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4342,6 +4498,7 @@ def create_repeating_invoice_history_with_http_info(xero_tenant_id, repeating_in
     # @param repeating_invoices [RepeatingInvoices] RepeatingInvoices with an array of repeating invoice objects in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [RepeatingInvoices]
     def create_repeating_invoices(xero_tenant_id, repeating_invoices, opts = {})
       data, _status_code, _headers = create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices, opts)
@@ -4353,6 +4510,7 @@ def create_repeating_invoices(xero_tenant_id, repeating_invoices, opts = {})
     # @param repeating_invoices [RepeatingInvoices] RepeatingInvoices with an array of repeating invoice objects in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(RepeatingInvoices, Integer, Hash)>] RepeatingInvoices data, response status code and response headers
     def create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices, options = {})
       opts = options.dup
@@ -4388,6 +4546,7 @@ def create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4421,6 +4580,7 @@ def create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices,
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tax_rates [TaxRates] TaxRates array with TaxRate object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TaxRates]
     def create_tax_rates(xero_tenant_id, tax_rates, opts = {})
       data, _status_code, _headers = create_tax_rates_with_http_info(xero_tenant_id, tax_rates, opts)
@@ -4431,6 +4591,7 @@ def create_tax_rates(xero_tenant_id, tax_rates, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tax_rates [TaxRates] TaxRates array with TaxRate object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TaxRates, Integer, Hash)>] TaxRates data, response status code and response headers
     def create_tax_rates_with_http_info(xero_tenant_id, tax_rates, options = {})
       opts = options.dup
@@ -4465,6 +4626,7 @@ def create_tax_rates_with_http_info(xero_tenant_id, tax_rates, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4498,6 +4660,7 @@ def create_tax_rates_with_http_info(xero_tenant_id, tax_rates, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tracking_category [TrackingCategory] TrackingCategory object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TrackingCategories]
     def create_tracking_category(xero_tenant_id, tracking_category, opts = {})
       data, _status_code, _headers = create_tracking_category_with_http_info(xero_tenant_id, tracking_category, opts)
@@ -4508,6 +4671,7 @@ def create_tracking_category(xero_tenant_id, tracking_category, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tracking_category [TrackingCategory] TrackingCategory object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TrackingCategories, Integer, Hash)>] TrackingCategories data, response status code and response headers
     def create_tracking_category_with_http_info(xero_tenant_id, tracking_category, options = {})
       opts = options.dup
@@ -4542,6 +4706,7 @@ def create_tracking_category_with_http_info(xero_tenant_id, tracking_category, o
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4576,6 +4741,7 @@ def create_tracking_category_with_http_info(xero_tenant_id, tracking_category, o
     # @param tracking_category_id [String] Unique identifier for a TrackingCategory
     # @param tracking_option [TrackingOption] TrackingOption object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TrackingOptions]
     def create_tracking_options(xero_tenant_id, tracking_category_id, tracking_option, opts = {})
       data, _status_code, _headers = create_tracking_options_with_http_info(xero_tenant_id, tracking_category_id, tracking_option, opts)
@@ -4587,6 +4753,7 @@ def create_tracking_options(xero_tenant_id, tracking_category_id, tracking_optio
     # @param tracking_category_id [String] Unique identifier for a TrackingCategory
     # @param tracking_option [TrackingOption] TrackingOption object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TrackingOptions, Integer, Hash)>] TrackingOptions data, response status code and response headers
     def create_tracking_options_with_http_info(xero_tenant_id, tracking_category_id, tracking_option, options = {})
       opts = options.dup
@@ -4625,6 +4792,7 @@ def create_tracking_options_with_http_info(xero_tenant_id, tracking_category_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4733,6 +4901,7 @@ def delete_account_with_http_info(xero_tenant_id, account_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param batch_payment_delete [BatchPaymentDelete] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BatchPayments]
     def delete_batch_payment(xero_tenant_id, batch_payment_delete, opts = {})
       data, _status_code, _headers = delete_batch_payment_with_http_info(xero_tenant_id, batch_payment_delete, opts)
@@ -4743,6 +4912,7 @@ def delete_batch_payment(xero_tenant_id, batch_payment_delete, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param batch_payment_delete [BatchPaymentDelete] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BatchPayments, Integer, Hash)>] BatchPayments data, response status code and response headers
     def delete_batch_payment_with_http_info(xero_tenant_id, batch_payment_delete, options = {})
       opts = options.dup
@@ -4777,6 +4947,7 @@ def delete_batch_payment_with_http_info(xero_tenant_id, batch_payment_delete, op
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4811,6 +4982,7 @@ def delete_batch_payment_with_http_info(xero_tenant_id, batch_payment_delete, op
     # @param batch_payment_id [String] Unique identifier for BatchPayment
     # @param batch_payment_delete_by_url_param [BatchPaymentDeleteByUrlParam] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BatchPayments]
     def delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param, opts = {})
       data, _status_code, _headers = delete_batch_payment_by_url_param_with_http_info(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param, opts)
@@ -4822,6 +4994,7 @@ def delete_batch_payment_by_url_param(xero_tenant_id, batch_payment_id, batch_pa
     # @param batch_payment_id [String] Unique identifier for BatchPayment
     # @param batch_payment_delete_by_url_param [BatchPaymentDeleteByUrlParam] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BatchPayments, Integer, Hash)>] BatchPayments data, response status code and response headers
     def delete_batch_payment_by_url_param_with_http_info(xero_tenant_id, batch_payment_id, batch_payment_delete_by_url_param, options = {})
       opts = options.dup
@@ -4860,6 +5033,7 @@ def delete_batch_payment_by_url_param_with_http_info(xero_tenant_id, batch_payme
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5043,6 +5217,87 @@ def delete_contact_group_contacts_with_http_info(xero_tenant_id, contact_group_i
       return data, status_code, headers
     end
 
+    # Deletes an Allocation from a Credit Note
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param credit_note_id [String] Unique identifier for a Credit Note
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Allocation]
+    def delete_credit_note_allocations(xero_tenant_id, credit_note_id, allocation_id, opts = {})
+      data, _status_code, _headers = delete_credit_note_allocations_with_http_info(xero_tenant_id, credit_note_id, allocation_id, opts)
+      data
+    end
+
+    # Deletes an Allocation from a Credit Note
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param credit_note_id [String] Unique identifier for a Credit Note
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Array<(Allocation, Integer, Hash)>] Allocation data, response status code and response headers
+    def delete_credit_note_allocations_with_http_info(xero_tenant_id, credit_note_id, allocation_id, options = {})
+      opts = options.dup
+      if @api_client.config.debugging
+        @api_client.config.logger.debug 'Calling API: AccountingApi.delete_credit_note_allocations ...'
+      end
+      # verify the required parameter 'xero_tenant_id' is set
+      if @api_client.config.client_side_validation && xero_tenant_id.nil?
+        fail ArgumentError, "Missing the required parameter 'xero_tenant_id' when calling AccountingApi.delete_credit_note_allocations"
+      end
+      # verify the required parameter 'credit_note_id' is set
+      if @api_client.config.client_side_validation && credit_note_id.nil?
+        fail ArgumentError, "Missing the required parameter 'credit_note_id' when calling AccountingApi.delete_credit_note_allocations"
+      end
+      # verify the required parameter 'allocation_id' is set
+      if @api_client.config.client_side_validation && allocation_id.nil?
+        fail ArgumentError, "Missing the required parameter 'allocation_id' when calling AccountingApi.delete_credit_note_allocations"
+      end
+      # resource path
+      local_var_path = '/CreditNotes/{CreditNoteID}/Allocations/{AllocationID}'.sub('{' + 'CreditNoteID' + '}', credit_note_id.to_s).sub('{' + 'AllocationID' + '}', allocation_id.to_s)
+
+      # camelize keys of incoming `where` opts
+      opts[:'where'] = @api_client.parameterize_where(opts[:'where']) if !opts[:'where'].nil?
+
+      # query parameters
+      query_params = opts[:query_params] || {}
+      
+      # XeroAPI's `IDs` convention openapi-generator does not snake_case properly.. manual over-riding `i_ds` malformations:
+      query_params[:'IDs'] = @api_client.build_collection_param(opts[:'ids'], :csv) if !opts[:'ids'].nil?
+      query_params[:'ContactIDs'] = @api_client.build_collection_param(opts[:'contact_ids'], :csv) if !opts[:'contact_ids'].nil?
+
+      # header parameters
+      header_params = opts[:header_params] || {}
+      # HTTP header 'Accept' (if needed)
+      header_params['Accept'] = @api_client.select_header_accept(['application/json'])
+      header_params[:'xero-tenant-id'] = xero_tenant_id
+
+      # form parameters
+      form_params = opts[:form_params] || {}
+
+      # http body (model)
+      post_body = opts[:body] 
+
+      # return_type
+      return_type = opts[:return_type] || 'Allocation' 
+
+      # auth_names
+      auth_names = opts[:auth_names] || ['OAuth2']
+
+      new_options = opts.merge(
+        :header_params => header_params,
+        :query_params => query_params,
+        :form_params => form_params,
+        :body => post_body,
+        :auth_names => auth_names,
+        :return_type => return_type
+      )
+
+      data, status_code, headers = @api_client.call_api(:DELETE, local_var_path, "AccountingApi", new_options)
+      if @api_client.config.debugging
+        @api_client.config.logger.debug "API called: AccountingApi#delete_credit_note_allocations\nData: #{data.inspect}\nStatus code: #{status_code}\nHeaders: #{headers}"
+      end
+      return data, status_code, headers
+    end
+
     # Deletes a specific item
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param item_id [String] Unique identifier for an Item
@@ -5193,11 +5448,93 @@ def delete_linked_transaction_with_http_info(xero_tenant_id, linked_transaction_
       return data, status_code, headers
     end
 
+    # Deletes an Allocation from an overpayment
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param overpayment_id [String] Unique identifier for a Overpayment
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Allocation]
+    def delete_overpayment_allocations(xero_tenant_id, overpayment_id, allocation_id, opts = {})
+      data, _status_code, _headers = delete_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id, allocation_id, opts)
+      data
+    end
+
+    # Deletes an Allocation from an overpayment
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param overpayment_id [String] Unique identifier for a Overpayment
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Array<(Allocation, Integer, Hash)>] Allocation data, response status code and response headers
+    def delete_overpayment_allocations_with_http_info(xero_tenant_id, overpayment_id, allocation_id, options = {})
+      opts = options.dup
+      if @api_client.config.debugging
+        @api_client.config.logger.debug 'Calling API: AccountingApi.delete_overpayment_allocations ...'
+      end
+      # verify the required parameter 'xero_tenant_id' is set
+      if @api_client.config.client_side_validation && xero_tenant_id.nil?
+        fail ArgumentError, "Missing the required parameter 'xero_tenant_id' when calling AccountingApi.delete_overpayment_allocations"
+      end
+      # verify the required parameter 'overpayment_id' is set
+      if @api_client.config.client_side_validation && overpayment_id.nil?
+        fail ArgumentError, "Missing the required parameter 'overpayment_id' when calling AccountingApi.delete_overpayment_allocations"
+      end
+      # verify the required parameter 'allocation_id' is set
+      if @api_client.config.client_side_validation && allocation_id.nil?
+        fail ArgumentError, "Missing the required parameter 'allocation_id' when calling AccountingApi.delete_overpayment_allocations"
+      end
+      # resource path
+      local_var_path = '/Overpayments/{OverpaymentID}/Allocations/{AllocationID}'.sub('{' + 'OverpaymentID' + '}', overpayment_id.to_s).sub('{' + 'AllocationID' + '}', allocation_id.to_s)
+
+      # camelize keys of incoming `where` opts
+      opts[:'where'] = @api_client.parameterize_where(opts[:'where']) if !opts[:'where'].nil?
+
+      # query parameters
+      query_params = opts[:query_params] || {}
+      
+      # XeroAPI's `IDs` convention openapi-generator does not snake_case properly.. manual over-riding `i_ds` malformations:
+      query_params[:'IDs'] = @api_client.build_collection_param(opts[:'ids'], :csv) if !opts[:'ids'].nil?
+      query_params[:'ContactIDs'] = @api_client.build_collection_param(opts[:'contact_ids'], :csv) if !opts[:'contact_ids'].nil?
+
+      # header parameters
+      header_params = opts[:header_params] || {}
+      # HTTP header 'Accept' (if needed)
+      header_params['Accept'] = @api_client.select_header_accept(['application/json'])
+      header_params[:'xero-tenant-id'] = xero_tenant_id
+
+      # form parameters
+      form_params = opts[:form_params] || {}
+
+      # http body (model)
+      post_body = opts[:body] 
+
+      # return_type
+      return_type = opts[:return_type] || 'Allocation' 
+
+      # auth_names
+      auth_names = opts[:auth_names] || ['OAuth2']
+
+      new_options = opts.merge(
+        :header_params => header_params,
+        :query_params => query_params,
+        :form_params => form_params,
+        :body => post_body,
+        :auth_names => auth_names,
+        :return_type => return_type
+      )
+
+      data, status_code, headers = @api_client.call_api(:DELETE, local_var_path, "AccountingApi", new_options)
+      if @api_client.config.debugging
+        @api_client.config.logger.debug "API called: AccountingApi#delete_overpayment_allocations\nData: #{data.inspect}\nStatus code: #{status_code}\nHeaders: #{headers}"
+      end
+      return data, status_code, headers
+    end
+
     # Updates a specific payment for invoices and credit notes
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payment_id [String] Unique identifier for a Payment
     # @param payment_delete [PaymentDelete] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Payments]
     def delete_payment(xero_tenant_id, payment_id, payment_delete, opts = {})
       data, _status_code, _headers = delete_payment_with_http_info(xero_tenant_id, payment_id, payment_delete, opts)
@@ -5209,6 +5546,7 @@ def delete_payment(xero_tenant_id, payment_id, payment_delete, opts = {})
     # @param payment_id [String] Unique identifier for a Payment
     # @param payment_delete [PaymentDelete] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Payments, Integer, Hash)>] Payments data, response status code and response headers
     def delete_payment_with_http_info(xero_tenant_id, payment_id, payment_delete, options = {})
       opts = options.dup
@@ -5247,6 +5585,7 @@ def delete_payment_with_http_info(xero_tenant_id, payment_id, payment_delete, op
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5276,6 +5615,87 @@ def delete_payment_with_http_info(xero_tenant_id, payment_id, payment_delete, op
       return data, status_code, headers
     end
 
+    # Deletes an Allocation from a Prepayment
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param prepayment_id [String] Unique identifier for a PrePayment
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Allocation]
+    def delete_prepayment_allocations(xero_tenant_id, prepayment_id, allocation_id, opts = {})
+      data, _status_code, _headers = delete_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id, allocation_id, opts)
+      data
+    end
+
+    # Deletes an Allocation from a Prepayment
+    # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param prepayment_id [String] Unique identifier for a PrePayment
+    # @param allocation_id [String] Unique identifier for Allocation object
+    # @param [Hash] opts the optional parameters
+    # @return [Array<(Allocation, Integer, Hash)>] Allocation data, response status code and response headers
+    def delete_prepayment_allocations_with_http_info(xero_tenant_id, prepayment_id, allocation_id, options = {})
+      opts = options.dup
+      if @api_client.config.debugging
+        @api_client.config.logger.debug 'Calling API: AccountingApi.delete_prepayment_allocations ...'
+      end
+      # verify the required parameter 'xero_tenant_id' is set
+      if @api_client.config.client_side_validation && xero_tenant_id.nil?
+        fail ArgumentError, "Missing the required parameter 'xero_tenant_id' when calling AccountingApi.delete_prepayment_allocations"
+      end
+      # verify the required parameter 'prepayment_id' is set
+      if @api_client.config.client_side_validation && prepayment_id.nil?
+        fail ArgumentError, "Missing the required parameter 'prepayment_id' when calling AccountingApi.delete_prepayment_allocations"
+      end
+      # verify the required parameter 'allocation_id' is set
+      if @api_client.config.client_side_validation && allocation_id.nil?
+        fail ArgumentError, "Missing the required parameter 'allocation_id' when calling AccountingApi.delete_prepayment_allocations"
+      end
+      # resource path
+      local_var_path = '/Prepayments/{PrepaymentID}/Allocations/{AllocationID}'.sub('{' + 'PrepaymentID' + '}', prepayment_id.to_s).sub('{' + 'AllocationID' + '}', allocation_id.to_s)
+
+      # camelize keys of incoming `where` opts
+      opts[:'where'] = @api_client.parameterize_where(opts[:'where']) if !opts[:'where'].nil?
+
+      # query parameters
+      query_params = opts[:query_params] || {}
+      
+      # XeroAPI's `IDs` convention openapi-generator does not snake_case properly.. manual over-riding `i_ds` malformations:
+      query_params[:'IDs'] = @api_client.build_collection_param(opts[:'ids'], :csv) if !opts[:'ids'].nil?
+      query_params[:'ContactIDs'] = @api_client.build_collection_param(opts[:'contact_ids'], :csv) if !opts[:'contact_ids'].nil?
+
+      # header parameters
+      header_params = opts[:header_params] || {}
+      # HTTP header 'Accept' (if needed)
+      header_params['Accept'] = @api_client.select_header_accept(['application/json'])
+      header_params[:'xero-tenant-id'] = xero_tenant_id
+
+      # form parameters
+      form_params = opts[:form_params] || {}
+
+      # http body (model)
+      post_body = opts[:body] 
+
+      # return_type
+      return_type = opts[:return_type] || 'Allocation' 
+
+      # auth_names
+      auth_names = opts[:auth_names] || ['OAuth2']
+
+      new_options = opts.merge(
+        :header_params => header_params,
+        :query_params => query_params,
+        :form_params => form_params,
+        :body => post_body,
+        :auth_names => auth_names,
+        :return_type => return_type
+      )
+
+      data, status_code, headers = @api_client.call_api(:DELETE, local_var_path, "AccountingApi", new_options)
+      if @api_client.config.debugging
+        @api_client.config.logger.debug "API called: AccountingApi#delete_prepayment_allocations\nData: #{data.inspect}\nStatus code: #{status_code}\nHeaders: #{headers}"
+      end
+      return data, status_code, headers
+    end
+
     # Deletes a specific tracking category
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tracking_category_id [String] Unique identifier for a TrackingCategory
@@ -5437,6 +5857,7 @@ def delete_tracking_options_with_http_info(xero_tenant_id, tracking_category_id,
     # @param invoice_id [String] Unique identifier for an Invoice
     # @param request_empty [RequestEmpty] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [nil]
     def email_invoice(xero_tenant_id, invoice_id, request_empty, opts = {})
       email_invoice_with_http_info(xero_tenant_id, invoice_id, request_empty, opts)
@@ -5448,6 +5869,7 @@ def email_invoice(xero_tenant_id, invoice_id, request_empty, opts = {})
     # @param invoice_id [String] Unique identifier for an Invoice
     # @param request_empty [RequestEmpty] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(nil, Integer, Hash)>] nil, response status code and response headers
     def email_invoice_with_http_info(xero_tenant_id, invoice_id, request_empty, options = {})
       opts = options.dup
@@ -5486,6 +5908,7 @@ def email_invoice_with_http_info(xero_tenant_id, invoice_id, request_empty, opti
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15569,6 +15992,7 @@ def get_users_with_http_info(xero_tenant_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param setup [Setup] Object including an accounts array, a conversion balances array and a conversion date object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ImportSummaryObject]
     def post_setup(xero_tenant_id, setup, opts = {})
       data, _status_code, _headers = post_setup_with_http_info(xero_tenant_id, setup, opts)
@@ -15579,6 +16003,7 @@ def post_setup(xero_tenant_id, setup, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param setup [Setup] Object including an accounts array, a conversion balances array and a conversion date object in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ImportSummaryObject, Integer, Hash)>] ImportSummaryObject data, response status code and response headers
     def post_setup_with_http_info(xero_tenant_id, setup, options = {})
       opts = options.dup
@@ -15613,6 +16038,7 @@ def post_setup_with_http_info(xero_tenant_id, setup, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15647,6 +16073,7 @@ def post_setup_with_http_info(xero_tenant_id, setup, options = {})
     # @param account_id [String] Unique identifier for Account object
     # @param accounts [Accounts] Request of type Accounts array with one Account
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Accounts]
     def update_account(xero_tenant_id, account_id, accounts, opts = {})
       data, _status_code, _headers = update_account_with_http_info(xero_tenant_id, account_id, accounts, opts)
@@ -15658,6 +16085,7 @@ def update_account(xero_tenant_id, account_id, accounts, opts = {})
     # @param account_id [String] Unique identifier for Account object
     # @param accounts [Accounts] Request of type Accounts array with one Account
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Accounts, Integer, Hash)>] Accounts data, response status code and response headers
     def update_account_with_http_info(xero_tenant_id, account_id, accounts, options = {})
       opts = options.dup
@@ -15696,6 +16124,7 @@ def update_account_with_http_info(xero_tenant_id, account_id, accounts, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15731,6 +16160,7 @@ def update_account_with_http_info(xero_tenant_id, account_id, accounts, options
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name, body, opts = {})
       data, _status_code, _headers = update_account_attachment_by_file_name_with_http_info(xero_tenant_id, account_id, file_name, body, opts)
@@ -15743,6 +16173,7 @@ def update_account_attachment_by_file_name(xero_tenant_id, account_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_account_attachment_by_file_name_with_http_info(xero_tenant_id, account_id, file_name, body, options = {})
       opts = options.dup
@@ -15785,6 +16216,7 @@ def update_account_attachment_by_file_name_with_http_info(xero_tenant_id, accoun
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15820,6 +16252,7 @@ def update_account_attachment_by_file_name_with_http_info(xero_tenant_id, accoun
     # @param bank_transactions [BankTransactions] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BankTransactions]
     def update_bank_transaction(xero_tenant_id, bank_transaction_id, bank_transactions, opts = {})
       data, _status_code, _headers = update_bank_transaction_with_http_info(xero_tenant_id, bank_transaction_id, bank_transactions, opts)
@@ -15832,6 +16265,7 @@ def update_bank_transaction(xero_tenant_id, bank_transaction_id, bank_transactio
     # @param bank_transactions [BankTransactions] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BankTransactions, Integer, Hash)>] BankTransactions data, response status code and response headers
     def update_bank_transaction_with_http_info(xero_tenant_id, bank_transaction_id, bank_transactions, options = {})
       opts = options.dup
@@ -15871,6 +16305,7 @@ def update_bank_transaction_with_http_info(xero_tenant_id, bank_transaction_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15906,6 +16341,7 @@ def update_bank_transaction_with_http_info(xero_tenant_id, bank_transaction_id,
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transaction_id, file_name, body, opts = {})
       data, _status_code, _headers = update_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transaction_id, file_name, body, opts)
@@ -15918,6 +16354,7 @@ def update_bank_transaction_attachment_by_file_name(xero_tenant_id, bank_transac
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transaction_id, file_name, body, options = {})
       opts = options.dup
@@ -15960,6 +16397,7 @@ def update_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_i
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -15994,6 +16432,7 @@ def update_bank_transaction_attachment_by_file_name_with_http_info(xero_tenant_i
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_id, file_name, body, opts = {})
       data, _status_code, _headers = update_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transfer_id, file_name, body, opts)
@@ -16005,6 +16444,7 @@ def update_bank_transfer_attachment_by_file_name(xero_tenant_id, bank_transfer_i
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id, bank_transfer_id, file_name, body, options = {})
       opts = options.dup
@@ -16047,6 +16487,7 @@ def update_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16081,6 +16522,7 @@ def update_bank_transfer_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param contact_id [String] Unique identifier for a Contact
     # @param contacts [Contacts] an array of Contacts containing single Contact object with properties to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Contacts]
     def update_contact(xero_tenant_id, contact_id, contacts, opts = {})
       data, _status_code, _headers = update_contact_with_http_info(xero_tenant_id, contact_id, contacts, opts)
@@ -16092,6 +16534,7 @@ def update_contact(xero_tenant_id, contact_id, contacts, opts = {})
     # @param contact_id [String] Unique identifier for a Contact
     # @param contacts [Contacts] an array of Contacts containing single Contact object with properties to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Contacts, Integer, Hash)>] Contacts data, response status code and response headers
     def update_contact_with_http_info(xero_tenant_id, contact_id, contacts, options = {})
       opts = options.dup
@@ -16130,6 +16573,7 @@ def update_contact_with_http_info(xero_tenant_id, contact_id, contacts, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16164,6 +16608,7 @@ def update_contact_with_http_info(xero_tenant_id, contact_id, contacts, options
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name, body, opts = {})
       data, _status_code, _headers = update_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contact_id, file_name, body, opts)
@@ -16175,6 +16620,7 @@ def update_contact_attachment_by_file_name(xero_tenant_id, contact_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contact_id, file_name, body, options = {})
       opts = options.dup
@@ -16217,6 +16663,7 @@ def update_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contac
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16251,6 +16698,7 @@ def update_contact_attachment_by_file_name_with_http_info(xero_tenant_id, contac
     # @param contact_group_id [String] Unique identifier for a Contact Group
     # @param contact_groups [ContactGroups] an array of Contact groups with Name of specific group to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ContactGroups]
     def update_contact_group(xero_tenant_id, contact_group_id, contact_groups, opts = {})
       data, _status_code, _headers = update_contact_group_with_http_info(xero_tenant_id, contact_group_id, contact_groups, opts)
@@ -16262,6 +16710,7 @@ def update_contact_group(xero_tenant_id, contact_group_id, contact_groups, opts
     # @param contact_group_id [String] Unique identifier for a Contact Group
     # @param contact_groups [ContactGroups] an array of Contact groups with Name of specific group to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ContactGroups, Integer, Hash)>] ContactGroups data, response status code and response headers
     def update_contact_group_with_http_info(xero_tenant_id, contact_group_id, contact_groups, options = {})
       opts = options.dup
@@ -16300,6 +16749,7 @@ def update_contact_group_with_http_info(xero_tenant_id, contact_group_id, contac
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16335,6 +16785,7 @@ def update_contact_group_with_http_info(xero_tenant_id, contact_group_id, contac
     # @param credit_notes [CreditNotes] an array of Credit Notes containing credit note details to update
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [CreditNotes]
     def update_credit_note(xero_tenant_id, credit_note_id, credit_notes, opts = {})
       data, _status_code, _headers = update_credit_note_with_http_info(xero_tenant_id, credit_note_id, credit_notes, opts)
@@ -16347,6 +16798,7 @@ def update_credit_note(xero_tenant_id, credit_note_id, credit_notes, opts = {})
     # @param credit_notes [CreditNotes] an array of Credit Notes containing credit note details to update
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(CreditNotes, Integer, Hash)>] CreditNotes data, response status code and response headers
     def update_credit_note_with_http_info(xero_tenant_id, credit_note_id, credit_notes, options = {})
       opts = options.dup
@@ -16386,6 +16838,7 @@ def update_credit_note_with_http_info(xero_tenant_id, credit_note_id, credit_not
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16421,6 +16874,7 @@ def update_credit_note_with_http_info(xero_tenant_id, credit_note_id, credit_not
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, file_name, body, opts = {})
       data, _status_code, _headers = update_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, credit_note_id, file_name, body, opts)
@@ -16433,6 +16887,7 @@ def update_credit_note_attachment_by_file_name(xero_tenant_id, credit_note_id, f
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, credit_note_id, file_name, body, options = {})
       opts = options.dup
@@ -16475,6 +16930,7 @@ def update_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, cr
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16509,6 +16965,7 @@ def update_credit_note_attachment_by_file_name_with_http_info(xero_tenant_id, cr
     # @param expense_claim_id [String] Unique identifier for a ExpenseClaim
     # @param expense_claims [ExpenseClaims] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ExpenseClaims]
     def update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims, opts = {})
       data, _status_code, _headers = update_expense_claim_with_http_info(xero_tenant_id, expense_claim_id, expense_claims, opts)
@@ -16520,6 +16977,7 @@ def update_expense_claim(xero_tenant_id, expense_claim_id, expense_claims, opts
     # @param expense_claim_id [String] Unique identifier for a ExpenseClaim
     # @param expense_claims [ExpenseClaims] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ExpenseClaims, Integer, Hash)>] ExpenseClaims data, response status code and response headers
     def update_expense_claim_with_http_info(xero_tenant_id, expense_claim_id, expense_claims, options = {})
       opts = options.dup
@@ -16558,6 +17016,7 @@ def update_expense_claim_with_http_info(xero_tenant_id, expense_claim_id, expens
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16593,6 +17052,7 @@ def update_expense_claim_with_http_info(xero_tenant_id, expense_claim_id, expens
     # @param invoices [Invoices] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Invoices]
     def update_invoice(xero_tenant_id, invoice_id, invoices, opts = {})
       data, _status_code, _headers = update_invoice_with_http_info(xero_tenant_id, invoice_id, invoices, opts)
@@ -16605,6 +17065,7 @@ def update_invoice(xero_tenant_id, invoice_id, invoices, opts = {})
     # @param invoices [Invoices] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Invoices, Integer, Hash)>] Invoices data, response status code and response headers
     def update_invoice_with_http_info(xero_tenant_id, invoice_id, invoices, options = {})
       opts = options.dup
@@ -16644,6 +17105,7 @@ def update_invoice_with_http_info(xero_tenant_id, invoice_id, invoices, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16679,6 +17141,7 @@ def update_invoice_with_http_info(xero_tenant_id, invoice_id, invoices, options
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name, body, opts = {})
       data, _status_code, _headers = update_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoice_id, file_name, body, opts)
@@ -16691,6 +17154,7 @@ def update_invoice_attachment_by_file_name(xero_tenant_id, invoice_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoice_id, file_name, body, options = {})
       opts = options.dup
@@ -16733,6 +17197,7 @@ def update_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoic
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16768,6 +17233,7 @@ def update_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, invoic
     # @param items [Items] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Items]
     def update_item(xero_tenant_id, item_id, items, opts = {})
       data, _status_code, _headers = update_item_with_http_info(xero_tenant_id, item_id, items, opts)
@@ -16780,6 +17246,7 @@ def update_item(xero_tenant_id, item_id, items, opts = {})
     # @param items [Items] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Items, Integer, Hash)>] Items data, response status code and response headers
     def update_item_with_http_info(xero_tenant_id, item_id, items, options = {})
       opts = options.dup
@@ -16819,6 +17286,7 @@ def update_item_with_http_info(xero_tenant_id, item_id, items, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16853,6 +17321,7 @@ def update_item_with_http_info(xero_tenant_id, item_id, items, options = {})
     # @param linked_transaction_id [String] Unique identifier for a LinkedTransaction
     # @param linked_transactions [LinkedTransactions] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LinkedTransactions]
     def update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_transactions, opts = {})
       data, _status_code, _headers = update_linked_transaction_with_http_info(xero_tenant_id, linked_transaction_id, linked_transactions, opts)
@@ -16864,6 +17333,7 @@ def update_linked_transaction(xero_tenant_id, linked_transaction_id, linked_tran
     # @param linked_transaction_id [String] Unique identifier for a LinkedTransaction
     # @param linked_transactions [LinkedTransactions] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LinkedTransactions, Integer, Hash)>] LinkedTransactions data, response status code and response headers
     def update_linked_transaction_with_http_info(xero_tenant_id, linked_transaction_id, linked_transactions, options = {})
       opts = options.dup
@@ -16902,6 +17372,7 @@ def update_linked_transaction_with_http_info(xero_tenant_id, linked_transaction_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -16936,6 +17407,7 @@ def update_linked_transaction_with_http_info(xero_tenant_id, linked_transaction_
     # @param manual_journal_id [String] Unique identifier for a ManualJournal
     # @param manual_journals [ManualJournals] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ManualJournals]
     def update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals, opts = {})
       data, _status_code, _headers = update_manual_journal_with_http_info(xero_tenant_id, manual_journal_id, manual_journals, opts)
@@ -16947,6 +17419,7 @@ def update_manual_journal(xero_tenant_id, manual_journal_id, manual_journals, op
     # @param manual_journal_id [String] Unique identifier for a ManualJournal
     # @param manual_journals [ManualJournals] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ManualJournals, Integer, Hash)>] ManualJournals data, response status code and response headers
     def update_manual_journal_with_http_info(xero_tenant_id, manual_journal_id, manual_journals, options = {})
       opts = options.dup
@@ -16985,6 +17458,7 @@ def update_manual_journal_with_http_info(xero_tenant_id, manual_journal_id, manu
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17020,6 +17494,7 @@ def update_manual_journal_with_http_info(xero_tenant_id, manual_journal_id, manu
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal_id, file_name, body, opts = {})
       data, _status_code, _headers = update_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id, manual_journal_id, file_name, body, opts)
@@ -17032,6 +17507,7 @@ def update_manual_journal_attachment_by_file_name(xero_tenant_id, manual_journal
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id, manual_journal_id, file_name, body, options = {})
       opts = options.dup
@@ -17074,6 +17550,7 @@ def update_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17109,6 +17586,7 @@ def update_manual_journal_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BankTransactions]
     def update_or_create_bank_transactions(xero_tenant_id, bank_transactions, opts = {})
       data, _status_code, _headers = update_or_create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, opts)
@@ -17121,6 +17599,7 @@ def update_or_create_bank_transactions(xero_tenant_id, bank_transactions, opts =
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BankTransactions, Integer, Hash)>] BankTransactions data, response status code and response headers
     def update_or_create_bank_transactions_with_http_info(xero_tenant_id, bank_transactions, options = {})
       opts = options.dup
@@ -17157,6 +17636,7 @@ def update_or_create_bank_transactions_with_http_info(xero_tenant_id, bank_trans
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17191,6 +17671,7 @@ def update_or_create_bank_transactions_with_http_info(xero_tenant_id, bank_trans
     # @param contacts [Contacts] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Contacts]
     def update_or_create_contacts(xero_tenant_id, contacts, opts = {})
       data, _status_code, _headers = update_or_create_contacts_with_http_info(xero_tenant_id, contacts, opts)
@@ -17202,6 +17683,7 @@ def update_or_create_contacts(xero_tenant_id, contacts, opts = {})
     # @param contacts [Contacts] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Contacts, Integer, Hash)>] Contacts data, response status code and response headers
     def update_or_create_contacts_with_http_info(xero_tenant_id, contacts, options = {})
       opts = options.dup
@@ -17237,6 +17719,7 @@ def update_or_create_contacts_with_http_info(xero_tenant_id, contacts, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17272,6 +17755,7 @@ def update_or_create_contacts_with_http_info(xero_tenant_id, contacts, options =
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [CreditNotes]
     def update_or_create_credit_notes(xero_tenant_id, credit_notes, opts = {})
       data, _status_code, _headers = update_or_create_credit_notes_with_http_info(xero_tenant_id, credit_notes, opts)
@@ -17284,6 +17768,7 @@ def update_or_create_credit_notes(xero_tenant_id, credit_notes, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(CreditNotes, Integer, Hash)>] CreditNotes data, response status code and response headers
     def update_or_create_credit_notes_with_http_info(xero_tenant_id, credit_notes, options = {})
       opts = options.dup
@@ -17320,6 +17805,7 @@ def update_or_create_credit_notes_with_http_info(xero_tenant_id, credit_notes, o
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17354,6 +17840,7 @@ def update_or_create_credit_notes_with_http_info(xero_tenant_id, credit_notes, o
     # @param employees [Employees] Employees with array of Employee object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Employees]
     def update_or_create_employees(xero_tenant_id, employees, opts = {})
       data, _status_code, _headers = update_or_create_employees_with_http_info(xero_tenant_id, employees, opts)
@@ -17365,6 +17852,7 @@ def update_or_create_employees(xero_tenant_id, employees, opts = {})
     # @param employees [Employees] Employees with array of Employee object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Employees, Integer, Hash)>] Employees data, response status code and response headers
     def update_or_create_employees_with_http_info(xero_tenant_id, employees, options = {})
       opts = options.dup
@@ -17400,6 +17888,7 @@ def update_or_create_employees_with_http_info(xero_tenant_id, employees, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17435,6 +17924,7 @@ def update_or_create_employees_with_http_info(xero_tenant_id, employees, options
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Invoices]
     def update_or_create_invoices(xero_tenant_id, invoices, opts = {})
       data, _status_code, _headers = update_or_create_invoices_with_http_info(xero_tenant_id, invoices, opts)
@@ -17447,6 +17937,7 @@ def update_or_create_invoices(xero_tenant_id, invoices, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Invoices, Integer, Hash)>] Invoices data, response status code and response headers
     def update_or_create_invoices_with_http_info(xero_tenant_id, invoices, options = {})
       opts = options.dup
@@ -17483,6 +17974,7 @@ def update_or_create_invoices_with_http_info(xero_tenant_id, invoices, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17518,6 +18010,7 @@ def update_or_create_invoices_with_http_info(xero_tenant_id, invoices, options =
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Items]
     def update_or_create_items(xero_tenant_id, items, opts = {})
       data, _status_code, _headers = update_or_create_items_with_http_info(xero_tenant_id, items, opts)
@@ -17530,6 +18023,7 @@ def update_or_create_items(xero_tenant_id, items, opts = {})
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Items, Integer, Hash)>] Items data, response status code and response headers
     def update_or_create_items_with_http_info(xero_tenant_id, items, options = {})
       opts = options.dup
@@ -17566,6 +18060,7 @@ def update_or_create_items_with_http_info(xero_tenant_id, items, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17600,6 +18095,7 @@ def update_or_create_items_with_http_info(xero_tenant_id, items, options = {})
     # @param manual_journals [ManualJournals] ManualJournals array with ManualJournal object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ManualJournals]
     def update_or_create_manual_journals(xero_tenant_id, manual_journals, opts = {})
       data, _status_code, _headers = update_or_create_manual_journals_with_http_info(xero_tenant_id, manual_journals, opts)
@@ -17611,6 +18107,7 @@ def update_or_create_manual_journals(xero_tenant_id, manual_journals, opts = {})
     # @param manual_journals [ManualJournals] ManualJournals array with ManualJournal object in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ManualJournals, Integer, Hash)>] ManualJournals data, response status code and response headers
     def update_or_create_manual_journals_with_http_info(xero_tenant_id, manual_journals, options = {})
       opts = options.dup
@@ -17646,6 +18143,7 @@ def update_or_create_manual_journals_with_http_info(xero_tenant_id, manual_journ
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17680,6 +18178,7 @@ def update_or_create_manual_journals_with_http_info(xero_tenant_id, manual_journ
     # @param purchase_orders [PurchaseOrders] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PurchaseOrders]
     def update_or_create_purchase_orders(xero_tenant_id, purchase_orders, opts = {})
       data, _status_code, _headers = update_or_create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, opts)
@@ -17691,6 +18190,7 @@ def update_or_create_purchase_orders(xero_tenant_id, purchase_orders, opts = {})
     # @param purchase_orders [PurchaseOrders] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PurchaseOrders, Integer, Hash)>] PurchaseOrders data, response status code and response headers
     def update_or_create_purchase_orders_with_http_info(xero_tenant_id, purchase_orders, options = {})
       opts = options.dup
@@ -17726,6 +18226,7 @@ def update_or_create_purchase_orders_with_http_info(xero_tenant_id, purchase_ord
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17760,6 +18261,7 @@ def update_or_create_purchase_orders_with_http_info(xero_tenant_id, purchase_ord
     # @param quotes [Quotes] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Quotes]
     def update_or_create_quotes(xero_tenant_id, quotes, opts = {})
       data, _status_code, _headers = update_or_create_quotes_with_http_info(xero_tenant_id, quotes, opts)
@@ -17771,6 +18273,7 @@ def update_or_create_quotes(xero_tenant_id, quotes, opts = {})
     # @param quotes [Quotes] 
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Quotes, Integer, Hash)>] Quotes data, response status code and response headers
     def update_or_create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
       opts = options.dup
@@ -17806,6 +18309,7 @@ def update_or_create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17840,6 +18344,7 @@ def update_or_create_quotes_with_http_info(xero_tenant_id, quotes, options = {})
     # @param repeating_invoices [RepeatingInvoices] RepeatingInvoices with an array of repeating invoice objects in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (default to false)
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [RepeatingInvoices]
     def update_or_create_repeating_invoices(xero_tenant_id, repeating_invoices, opts = {})
       data, _status_code, _headers = update_or_create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices, opts)
@@ -17851,6 +18356,7 @@ def update_or_create_repeating_invoices(xero_tenant_id, repeating_invoices, opts
     # @param repeating_invoices [RepeatingInvoices] RepeatingInvoices with an array of repeating invoice objects in body of request
     # @param [Hash] opts the optional parameters
     # @option opts [Boolean] :summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(RepeatingInvoices, Integer, Hash)>] RepeatingInvoices data, response status code and response headers
     def update_or_create_repeating_invoices_with_http_info(xero_tenant_id, repeating_invoices, options = {})
       opts = options.dup
@@ -17886,6 +18392,7 @@ def update_or_create_repeating_invoices_with_http_info(xero_tenant_id, repeating
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -17920,6 +18427,7 @@ def update_or_create_repeating_invoices_with_http_info(xero_tenant_id, repeating
     # @param purchase_order_id [String] Unique identifier for an Purchase Order
     # @param purchase_orders [PurchaseOrders] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PurchaseOrders]
     def update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders, opts = {})
       data, _status_code, _headers = update_purchase_order_with_http_info(xero_tenant_id, purchase_order_id, purchase_orders, opts)
@@ -17931,6 +18439,7 @@ def update_purchase_order(xero_tenant_id, purchase_order_id, purchase_orders, op
     # @param purchase_order_id [String] Unique identifier for an Purchase Order
     # @param purchase_orders [PurchaseOrders] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PurchaseOrders, Integer, Hash)>] PurchaseOrders data, response status code and response headers
     def update_purchase_order_with_http_info(xero_tenant_id, purchase_order_id, purchase_orders, options = {})
       opts = options.dup
@@ -17969,6 +18478,7 @@ def update_purchase_order_with_http_info(xero_tenant_id, purchase_order_id, purc
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18004,6 +18514,7 @@ def update_purchase_order_with_http_info(xero_tenant_id, purchase_order_id, purc
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order_id, file_name, body, opts = {})
       data, _status_code, _headers = update_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id, purchase_order_id, file_name, body, opts)
@@ -18016,6 +18527,7 @@ def update_purchase_order_attachment_by_file_name(xero_tenant_id, purchase_order
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id, purchase_order_id, file_name, body, options = {})
       opts = options.dup
@@ -18058,6 +18570,7 @@ def update_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18092,6 +18605,7 @@ def update_purchase_order_attachment_by_file_name_with_http_info(xero_tenant_id,
     # @param quote_id [String] Unique identifier for an Quote
     # @param quotes [Quotes] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Quotes]
     def update_quote(xero_tenant_id, quote_id, quotes, opts = {})
       data, _status_code, _headers = update_quote_with_http_info(xero_tenant_id, quote_id, quotes, opts)
@@ -18103,6 +18617,7 @@ def update_quote(xero_tenant_id, quote_id, quotes, opts = {})
     # @param quote_id [String] Unique identifier for an Quote
     # @param quotes [Quotes] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Quotes, Integer, Hash)>] Quotes data, response status code and response headers
     def update_quote_with_http_info(xero_tenant_id, quote_id, quotes, options = {})
       opts = options.dup
@@ -18141,6 +18656,7 @@ def update_quote_with_http_info(xero_tenant_id, quote_id, quotes, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18176,6 +18692,7 @@ def update_quote_with_http_info(xero_tenant_id, quote_id, quotes, options = {})
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, body, opts = {})
       data, _status_code, _headers = update_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id, file_name, body, opts)
@@ -18188,6 +18705,7 @@ def update_quote_attachment_by_file_name(xero_tenant_id, quote_id, file_name, bo
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id, file_name, body, options = {})
       opts = options.dup
@@ -18230,6 +18748,7 @@ def update_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18265,6 +18784,7 @@ def update_quote_attachment_by_file_name_with_http_info(xero_tenant_id, quote_id
     # @param receipts [Receipts] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Receipts]
     def update_receipt(xero_tenant_id, receipt_id, receipts, opts = {})
       data, _status_code, _headers = update_receipt_with_http_info(xero_tenant_id, receipt_id, receipts, opts)
@@ -18277,6 +18797,7 @@ def update_receipt(xero_tenant_id, receipt_id, receipts, opts = {})
     # @param receipts [Receipts] 
     # @param [Hash] opts the optional parameters
     # @option opts [Integer] :unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Receipts, Integer, Hash)>] Receipts data, response status code and response headers
     def update_receipt_with_http_info(xero_tenant_id, receipt_id, receipts, options = {})
       opts = options.dup
@@ -18316,6 +18837,7 @@ def update_receipt_with_http_info(xero_tenant_id, receipt_id, receipts, options
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18351,6 +18873,7 @@ def update_receipt_with_http_info(xero_tenant_id, receipt_id, receipts, options
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name, body, opts = {})
       data, _status_code, _headers = update_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receipt_id, file_name, body, opts)
@@ -18363,6 +18886,7 @@ def update_receipt_attachment_by_file_name(xero_tenant_id, receipt_id, file_name
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receipt_id, file_name, body, options = {})
       opts = options.dup
@@ -18405,6 +18929,7 @@ def update_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receip
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18439,6 +18964,7 @@ def update_receipt_attachment_by_file_name_with_http_info(xero_tenant_id, receip
     # @param repeating_invoice_id [String] Unique identifier for a Repeating Invoice
     # @param repeating_invoices [RepeatingInvoices] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [RepeatingInvoices]
     def update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_invoices, opts = {})
       data, _status_code, _headers = update_repeating_invoice_with_http_info(xero_tenant_id, repeating_invoice_id, repeating_invoices, opts)
@@ -18450,6 +18976,7 @@ def update_repeating_invoice(xero_tenant_id, repeating_invoice_id, repeating_inv
     # @param repeating_invoice_id [String] Unique identifier for a Repeating Invoice
     # @param repeating_invoices [RepeatingInvoices] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(RepeatingInvoices, Integer, Hash)>] RepeatingInvoices data, response status code and response headers
     def update_repeating_invoice_with_http_info(xero_tenant_id, repeating_invoice_id, repeating_invoices, options = {})
       opts = options.dup
@@ -18488,6 +19015,7 @@ def update_repeating_invoice_with_http_info(xero_tenant_id, repeating_invoice_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18523,6 +19051,7 @@ def update_repeating_invoice_with_http_info(xero_tenant_id, repeating_invoice_id
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Attachments]
     def update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_invoice_id, file_name, body, opts = {})
       data, _status_code, _headers = update_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, repeating_invoice_id, file_name, body, opts)
@@ -18535,6 +19064,7 @@ def update_repeating_invoice_attachment_by_file_name(xero_tenant_id, repeating_i
     # @param file_name [String] Name of the attachment
     # @param body [String] Byte array of file in body of request
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Attachments, Integer, Hash)>] Attachments data, response status code and response headers
     def update_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_id, repeating_invoice_id, file_name, body, options = {})
       opts = options.dup
@@ -18577,6 +19107,7 @@ def update_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/octet-stream'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18610,6 +19141,7 @@ def update_repeating_invoice_attachment_by_file_name_with_http_info(xero_tenant_
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tax_rates [TaxRates] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TaxRates]
     def update_tax_rate(xero_tenant_id, tax_rates, opts = {})
       data, _status_code, _headers = update_tax_rate_with_http_info(xero_tenant_id, tax_rates, opts)
@@ -18620,6 +19152,7 @@ def update_tax_rate(xero_tenant_id, tax_rates, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param tax_rates [TaxRates] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TaxRates, Integer, Hash)>] TaxRates data, response status code and response headers
     def update_tax_rate_with_http_info(xero_tenant_id, tax_rates, options = {})
       opts = options.dup
@@ -18654,6 +19187,7 @@ def update_tax_rate_with_http_info(xero_tenant_id, tax_rates, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18688,6 +19222,7 @@ def update_tax_rate_with_http_info(xero_tenant_id, tax_rates, options = {})
     # @param tracking_category_id [String] Unique identifier for a TrackingCategory
     # @param tracking_category [TrackingCategory] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TrackingCategories]
     def update_tracking_category(xero_tenant_id, tracking_category_id, tracking_category, opts = {})
       data, _status_code, _headers = update_tracking_category_with_http_info(xero_tenant_id, tracking_category_id, tracking_category, opts)
@@ -18699,6 +19234,7 @@ def update_tracking_category(xero_tenant_id, tracking_category_id, tracking_cate
     # @param tracking_category_id [String] Unique identifier for a TrackingCategory
     # @param tracking_category [TrackingCategory] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TrackingCategories, Integer, Hash)>] TrackingCategories data, response status code and response headers
     def update_tracking_category_with_http_info(xero_tenant_id, tracking_category_id, tracking_category, options = {})
       opts = options.dup
@@ -18737,6 +19273,7 @@ def update_tracking_category_with_http_info(xero_tenant_id, tracking_category_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -18772,6 +19309,7 @@ def update_tracking_category_with_http_info(xero_tenant_id, tracking_category_id
     # @param tracking_option_id [String] Unique identifier for a Tracking Option
     # @param tracking_option [TrackingOption] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TrackingOptions]
     def update_tracking_options(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option, opts = {})
       data, _status_code, _headers = update_tracking_options_with_http_info(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option, opts)
@@ -18784,6 +19322,7 @@ def update_tracking_options(xero_tenant_id, tracking_category_id, tracking_optio
     # @param tracking_option_id [String] Unique identifier for a Tracking Option
     # @param tracking_option [TrackingOption] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TrackingOptions, Integer, Hash)>] TrackingOptions data, response status code and response headers
     def update_tracking_options_with_http_info(xero_tenant_id, tracking_category_id, tracking_option_id, tracking_option, options = {})
       opts = options.dup
@@ -18826,6 +19365,7 @@ def update_tracking_options_with_http_info(xero_tenant_id, tracking_category_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/api/app_store_api.rb b/lib/xero-ruby/api/app_store_api.rb
index 37588ea8..2d1ac629 100644
--- a/lib/xero-ruby/api/app_store_api.rb
+++ b/lib/xero-ruby/api/app_store_api.rb
@@ -157,6 +157,7 @@ def get_usage_records_with_http_info(subscription_id, options = {})
     # @param subscription_item_id [String] The unique identifier of the subscriptionItem
     # @param create_usage_record [CreateUsageRecord] Contains the quantity for the usage record to create
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [UsageRecord]
     def post_usage_records(subscription_id, subscription_item_id, create_usage_record, opts = {})
       data, _status_code, _headers = post_usage_records_with_http_info(subscription_id, subscription_item_id, create_usage_record, opts)
@@ -168,6 +169,7 @@ def post_usage_records(subscription_id, subscription_item_id, create_usage_recor
     # @param subscription_item_id [String] The unique identifier of the subscriptionItem
     # @param create_usage_record [CreateUsageRecord] Contains the quantity for the usage record to create
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(UsageRecord, Integer, Hash)>] UsageRecord data, response status code and response headers
     def post_usage_records_with_http_info(subscription_id, subscription_item_id, create_usage_record, options = {})
       opts = options.dup
@@ -205,6 +207,7 @@ def post_usage_records_with_http_info(subscription_id, subscription_item_id, cre
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -240,6 +243,7 @@ def post_usage_records_with_http_info(subscription_id, subscription_item_id, cre
     # @param usage_record_id [String] The unique identifier of the usage record
     # @param update_usage_record [UpdateUsageRecord] Contains the quantity for the usage record to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [UsageRecord]
     def put_usage_records(subscription_id, subscription_item_id, usage_record_id, update_usage_record, opts = {})
       data, _status_code, _headers = put_usage_records_with_http_info(subscription_id, subscription_item_id, usage_record_id, update_usage_record, opts)
@@ -252,6 +256,7 @@ def put_usage_records(subscription_id, subscription_item_id, usage_record_id, up
     # @param usage_record_id [String] The unique identifier of the usage record
     # @param update_usage_record [UpdateUsageRecord] Contains the quantity for the usage record to update
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(UsageRecord, Integer, Hash)>] UsageRecord data, response status code and response headers
     def put_usage_records_with_http_info(subscription_id, subscription_item_id, usage_record_id, update_usage_record, options = {})
       opts = options.dup
@@ -293,6 +298,7 @@ def put_usage_records_with_http_info(subscription_id, subscription_item_id, usag
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/api/asset_api.rb b/lib/xero-ruby/api/asset_api.rb
index 51d8ac95..6c7e3714 100644
--- a/lib/xero-ruby/api/asset_api.rb
+++ b/lib/xero-ruby/api/asset_api.rb
@@ -21,6 +21,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param asset [Asset] Fixed asset you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Asset]
     def create_asset(xero_tenant_id, asset, opts = {})
       data, _status_code, _headers = create_asset_with_http_info(xero_tenant_id, asset, opts)
@@ -32,6 +33,7 @@ def create_asset(xero_tenant_id, asset, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param asset [Asset] Fixed asset you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Asset, Integer, Hash)>] Asset data, response status code and response headers
     def create_asset_with_http_info(xero_tenant_id, asset, options = {})
       opts = options.dup
@@ -66,6 +68,7 @@ def create_asset_with_http_info(xero_tenant_id, asset, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -98,21 +101,23 @@ def create_asset_with_http_info(xero_tenant_id, asset, options = {})
     # adds a fixed asset type
     # Adds an fixed asset type to the system
     # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param asset_type [AssetType] Asset type to add
     # @param [Hash] opts the optional parameters
-    # @option opts [AssetType] :asset_type Asset type to add
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [AssetType]
-    def create_asset_type(xero_tenant_id, opts = {})
-      data, _status_code, _headers = create_asset_type_with_http_info(xero_tenant_id, opts)
+    def create_asset_type(xero_tenant_id, asset_type, opts = {})
+      data, _status_code, _headers = create_asset_type_with_http_info(xero_tenant_id, asset_type, opts)
       data
     end
 
     # adds a fixed asset type
     # Adds an fixed asset type to the system
     # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param asset_type [AssetType] Asset type to add
     # @param [Hash] opts the optional parameters
-    # @option opts [AssetType] :asset_type Asset type to add
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(AssetType, Integer, Hash)>] AssetType data, response status code and response headers
-    def create_asset_type_with_http_info(xero_tenant_id, options = {})
+    def create_asset_type_with_http_info(xero_tenant_id, asset_type, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: AssetApi.create_asset_type ...'
@@ -121,6 +126,10 @@ def create_asset_type_with_http_info(xero_tenant_id, options = {})
       if @api_client.config.client_side_validation && xero_tenant_id.nil?
         fail ArgumentError, "Missing the required parameter 'xero_tenant_id' when calling AssetApi.create_asset_type"
       end
+      # verify the required parameter 'asset_type' is set
+      if @api_client.config.client_side_validation && asset_type.nil?
+        fail ArgumentError, "Missing the required parameter 'asset_type' when calling AssetApi.create_asset_type"
+      end
       # resource path
       local_var_path = '/AssetTypes'
 
@@ -141,12 +150,13 @@ def create_asset_type_with_http_info(xero_tenant_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'asset_type']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(asset_type) 
 
       # return_type
       return_type = opts[:return_type] || 'AssetType' 
diff --git a/lib/xero-ruby/api/files_api.rb b/lib/xero-ruby/api/files_api.rb
index 79661a61..08e5775b 100644
--- a/lib/xero-ruby/api/files_api.rb
+++ b/lib/xero-ruby/api/files_api.rb
@@ -20,11 +20,12 @@ def initialize(api_client = ApiClient.new)
     # By passing in the appropriate options, you can create a new folder
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param file_id [String] File id for single object
+    # @param association [Association] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Association] :association 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Association]
-    def create_file_association(xero_tenant_id, file_id, opts = {})
-      data, _status_code, _headers = create_file_association_with_http_info(xero_tenant_id, file_id, opts)
+    def create_file_association(xero_tenant_id, file_id, association, opts = {})
+      data, _status_code, _headers = create_file_association_with_http_info(xero_tenant_id, file_id, association, opts)
       data
     end
 
@@ -32,10 +33,11 @@ def create_file_association(xero_tenant_id, file_id, opts = {})
     # By passing in the appropriate options, you can create a new folder
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param file_id [String] File id for single object
+    # @param association [Association] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Association] :association 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Association, Integer, Hash)>] Association data, response status code and response headers
-    def create_file_association_with_http_info(xero_tenant_id, file_id, options = {})
+    def create_file_association_with_http_info(xero_tenant_id, file_id, association, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: FilesApi.create_file_association ...'
@@ -48,6 +50,10 @@ def create_file_association_with_http_info(xero_tenant_id, file_id, options = {}
       if @api_client.config.client_side_validation && file_id.nil?
         fail ArgumentError, "Missing the required parameter 'file_id' when calling FilesApi.create_file_association"
       end
+      # verify the required parameter 'association' is set
+      if @api_client.config.client_side_validation && association.nil?
+        fail ArgumentError, "Missing the required parameter 'association' when calling FilesApi.create_file_association"
+      end
       # resource path
       local_var_path = '/Files/{FileId}/Associations'.sub('{' + 'FileId' + '}', file_id.to_s)
 
@@ -68,12 +74,13 @@ def create_file_association_with_http_info(xero_tenant_id, file_id, options = {}
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'association']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(association) 
 
       # return_type
       return_type = opts[:return_type] || 'Association' 
@@ -100,21 +107,23 @@ def create_file_association_with_http_info(xero_tenant_id, file_id, options = {}
     # Creates a new folder
     # By passing in the appropriate properties, you can create a new folder
     # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param folder [Folder] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Folder] :folder 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Folder]
-    def create_folder(xero_tenant_id, opts = {})
-      data, _status_code, _headers = create_folder_with_http_info(xero_tenant_id, opts)
+    def create_folder(xero_tenant_id, folder, opts = {})
+      data, _status_code, _headers = create_folder_with_http_info(xero_tenant_id, folder, opts)
       data
     end
 
     # Creates a new folder
     # By passing in the appropriate properties, you can create a new folder
     # @param xero_tenant_id [String] Xero identifier for Tenant
+    # @param folder [Folder] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Folder] :folder 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Folder, Integer, Hash)>] Folder data, response status code and response headers
-    def create_folder_with_http_info(xero_tenant_id, options = {})
+    def create_folder_with_http_info(xero_tenant_id, folder, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: FilesApi.create_folder ...'
@@ -123,6 +132,10 @@ def create_folder_with_http_info(xero_tenant_id, options = {})
       if @api_client.config.client_side_validation && xero_tenant_id.nil?
         fail ArgumentError, "Missing the required parameter 'xero_tenant_id' when calling FilesApi.create_folder"
       end
+      # verify the required parameter 'folder' is set
+      if @api_client.config.client_side_validation && folder.nil?
+        fail ArgumentError, "Missing the required parameter 'folder' when calling FilesApi.create_folder"
+      end
       # resource path
       local_var_path = '/Folders'
 
@@ -143,12 +156,13 @@ def create_folder_with_http_info(xero_tenant_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'folder']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(folder) 
 
       # return_type
       return_type = opts[:return_type] || 'Folder' 
@@ -408,6 +422,10 @@ def delete_folder_with_http_info(xero_tenant_id, folder_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param object_id [String] Object id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [Integer] :pagesize pass an optional page size value
+    # @option opts [Integer] :page number of records to skip for pagination
+    # @option opts [String] :sort values to sort by
+    # @option opts [String] :direction direction to sort by
     # @return [Array<Association>]
     def get_associations_by_object(xero_tenant_id, object_id, opts = {})
       data, _status_code, _headers = get_associations_by_object_with_http_info(xero_tenant_id, object_id, opts)
@@ -419,6 +437,10 @@ def get_associations_by_object(xero_tenant_id, object_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param object_id [String] Object id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [Integer] :pagesize pass an optional page size value
+    # @option opts [Integer] :page number of records to skip for pagination
+    # @option opts [String] :sort values to sort by
+    # @option opts [String] :direction direction to sort by
     # @return [Array<(Array<Association>, Integer, Hash)>] Array<Association> data, response status code and response headers
     def get_associations_by_object_with_http_info(xero_tenant_id, object_id, options = {})
       opts = options.dup
@@ -433,6 +455,22 @@ def get_associations_by_object_with_http_info(xero_tenant_id, object_id, options
       if @api_client.config.client_side_validation && object_id.nil?
         fail ArgumentError, "Missing the required parameter 'object_id' when calling FilesApi.get_associations_by_object"
       end
+      if @api_client.config.client_side_validation && !opts[:'pagesize'].nil? && opts[:'pagesize'] > 100
+        fail ArgumentError, 'invalid value for "opts[:"pagesize"]" when calling FilesApi.get_associations_by_object, must be smaller than or equal to 100.'
+      end
+
+      if @api_client.config.client_side_validation && !opts[:'page'].nil? && opts[:'page'] < 1
+        fail ArgumentError, 'invalid value for "opts[:"page"]" when calling FilesApi.get_associations_by_object, must be greater than or equal to 1.'
+      end
+
+      allowable_values = ["Name", "CreatedDateUTC"]
+      if @api_client.config.client_side_validation && opts[:'sort'] && !allowable_values.include?(opts[:'sort'])
+        fail ArgumentError, "invalid value for \"sort\", must be one of #{allowable_values}"
+      end
+      allowable_values = ["ASC", "DESC"]
+      if @api_client.config.client_side_validation && opts[:'direction'] && !allowable_values.include?(opts[:'direction'])
+        fail ArgumentError, "invalid value for \"direction\", must be one of #{allowable_values}"
+      end
       # resource path
       local_var_path = '/Associations/{ObjectId}'.sub('{' + 'ObjectId' + '}', object_id.to_s)
 
@@ -441,6 +479,10 @@ def get_associations_by_object_with_http_info(xero_tenant_id, object_id, options
 
       # query parameters
       query_params = opts[:query_params] || {}
+      query_params[:'pagesize'] = opts[:'pagesize'] if !opts[:'pagesize'].nil?
+      query_params[:'page'] = opts[:'page'] if !opts[:'page'].nil?
+      query_params[:'sort'] = opts[:'sort'] if !opts[:'sort'].nil?
+      query_params[:'direction'] = opts[:'direction'] if !opts[:'direction'].nil?
       
       # XeroAPI's `IDs` convention openapi-generator does not snake_case properly.. manual over-riding `i_ds` malformations:
       query_params[:'IDs'] = @api_client.build_collection_param(opts[:'ids'], :csv) if !opts[:'ids'].nil?
@@ -1107,11 +1149,12 @@ def get_inbox_with_http_info(xero_tenant_id, options = {})
     # Updates file properties of a single file
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param file_id [String] File id for single object
+    # @param file_object [FileObject] 
     # @param [Hash] opts the optional parameters
-    # @option opts [FileObject] :file_object 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [FileObject]
-    def update_file(xero_tenant_id, file_id, opts = {})
-      data, _status_code, _headers = update_file_with_http_info(xero_tenant_id, file_id, opts)
+    def update_file(xero_tenant_id, file_id, file_object, opts = {})
+      data, _status_code, _headers = update_file_with_http_info(xero_tenant_id, file_id, file_object, opts)
       data
     end
 
@@ -1119,10 +1162,11 @@ def update_file(xero_tenant_id, file_id, opts = {})
     # Updates file properties of a single file
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param file_id [String] File id for single object
+    # @param file_object [FileObject] 
     # @param [Hash] opts the optional parameters
-    # @option opts [FileObject] :file_object 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(FileObject, Integer, Hash)>] FileObject data, response status code and response headers
-    def update_file_with_http_info(xero_tenant_id, file_id, options = {})
+    def update_file_with_http_info(xero_tenant_id, file_id, file_object, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: FilesApi.update_file ...'
@@ -1135,6 +1179,10 @@ def update_file_with_http_info(xero_tenant_id, file_id, options = {})
       if @api_client.config.client_side_validation && file_id.nil?
         fail ArgumentError, "Missing the required parameter 'file_id' when calling FilesApi.update_file"
       end
+      # verify the required parameter 'file_object' is set
+      if @api_client.config.client_side_validation && file_object.nil?
+        fail ArgumentError, "Missing the required parameter 'file_object' when calling FilesApi.update_file"
+      end
       # resource path
       local_var_path = '/Files/{FileId}'.sub('{' + 'FileId' + '}', file_id.to_s)
 
@@ -1155,12 +1203,13 @@ def update_file_with_http_info(xero_tenant_id, file_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'file_object']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(file_object) 
 
       # return_type
       return_type = opts[:return_type] || 'FileObject' 
@@ -1190,6 +1239,7 @@ def update_file_with_http_info(xero_tenant_id, file_id, options = {})
     # @param folder_id [String] Folder id for single object
     # @param folder [Folder] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Folder]
     def update_folder(xero_tenant_id, folder_id, folder, opts = {})
       data, _status_code, _headers = update_folder_with_http_info(xero_tenant_id, folder_id, folder, opts)
@@ -1202,6 +1252,7 @@ def update_folder(xero_tenant_id, folder_id, folder, opts = {})
     # @param folder_id [String] Folder id for single object
     # @param folder [Folder] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Folder, Integer, Hash)>] Folder data, response status code and response headers
     def update_folder_with_http_info(xero_tenant_id, folder_id, folder, options = {})
       opts = options.dup
@@ -1240,6 +1291,7 @@ def update_folder_with_http_info(xero_tenant_id, folder_id, folder, options = {}
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1275,6 +1327,7 @@ def update_folder_with_http_info(xero_tenant_id, folder_id, folder, options = {}
     # @param name [String] exact name of the file you are uploading
     # @param filename [String] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @option opts [String] :mime_type 
     # @return [FileObject]
     def upload_file(xero_tenant_id, body, name, filename, opts = {})
@@ -1288,6 +1341,7 @@ def upload_file(xero_tenant_id, body, name, filename, opts = {})
     # @param name [String] exact name of the file you are uploading
     # @param filename [String] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @option opts [String] :mime_type 
     # @return [Array<(FileObject, Integer, Hash)>] FileObject data, response status code and response headers
     def upload_file_with_http_info(xero_tenant_id, body, name, filename, options = {})
@@ -1331,6 +1385,7 @@ def upload_file_with_http_info(xero_tenant_id, body, name, filename, options = {
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['multipart/form-data'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1371,6 +1426,7 @@ def upload_file_with_http_info(xero_tenant_id, body, name, filename, options = {
     # @param name [String] exact name of the file you are uploading
     # @param filename [String] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @option opts [String] :mime_type 
     # @return [FileObject]
     def upload_file_to_folder(xero_tenant_id, folder_id, body, name, filename, opts = {})
@@ -1385,6 +1441,7 @@ def upload_file_to_folder(xero_tenant_id, folder_id, body, name, filename, opts
     # @param name [String] exact name of the file you are uploading
     # @param filename [String] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @option opts [String] :mime_type 
     # @return [Array<(FileObject, Integer, Hash)>] FileObject data, response status code and response headers
     def upload_file_to_folder_with_http_info(xero_tenant_id, folder_id, body, name, filename, options = {})
@@ -1432,6 +1489,7 @@ def upload_file_to_folder_with_http_info(xero_tenant_id, folder_id, body, name,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['multipart/form-data'])
       header_params[:'xero-tenant-id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/api/payroll_au_api.rb b/lib/xero-ruby/api/payroll_au_api.rb
index 79a824cd..bb118f27 100644
--- a/lib/xero-ruby/api/payroll_au_api.rb
+++ b/lib/xero-ruby/api/payroll_au_api.rb
@@ -20,6 +20,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application_id [String] Leave Application id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveApplications]
     def approve_leave_application(xero_tenant_id, leave_application_id, opts = {})
       data, _status_code, _headers = approve_leave_application_with_http_info(xero_tenant_id, leave_application_id, opts)
@@ -30,6 +31,7 @@ def approve_leave_application(xero_tenant_id, leave_application_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application_id [String] Leave Application id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveApplications, Integer, Hash)>] LeaveApplications data, response status code and response headers
     def approve_leave_application_with_http_info(xero_tenant_id, leave_application_id, options = {})
       opts = options.dup
@@ -62,6 +64,7 @@ def approve_leave_application_with_http_info(xero_tenant_id, leave_application_i
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -95,6 +98,7 @@ def approve_leave_application_with_http_info(xero_tenant_id, leave_application_i
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Array<Employee>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Employees]
     def create_employee(xero_tenant_id, employee, opts = {})
       data, _status_code, _headers = create_employee_with_http_info(xero_tenant_id, employee, opts)
@@ -105,6 +109,7 @@ def create_employee(xero_tenant_id, employee, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Array<Employee>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Employees, Integer, Hash)>] Employees data, response status code and response headers
     def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       opts = options.dup
@@ -139,6 +144,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -172,6 +178,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application [Array<LeaveApplication>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveApplications]
     def create_leave_application(xero_tenant_id, leave_application, opts = {})
       data, _status_code, _headers = create_leave_application_with_http_info(xero_tenant_id, leave_application, opts)
@@ -182,6 +189,7 @@ def create_leave_application(xero_tenant_id, leave_application, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application [Array<LeaveApplication>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveApplications, Integer, Hash)>] LeaveApplications data, response status code and response headers
     def create_leave_application_with_http_info(xero_tenant_id, leave_application, options = {})
       opts = options.dup
@@ -216,6 +224,7 @@ def create_leave_application_with_http_info(xero_tenant_id, leave_application, o
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -249,6 +258,7 @@ def create_leave_application_with_http_info(xero_tenant_id, leave_application, o
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_item [PayItem] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayItems]
     def create_pay_item(xero_tenant_id, pay_item, opts = {})
       data, _status_code, _headers = create_pay_item_with_http_info(xero_tenant_id, pay_item, opts)
@@ -259,6 +269,7 @@ def create_pay_item(xero_tenant_id, pay_item, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_item [PayItem] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayItems, Integer, Hash)>] PayItems data, response status code and response headers
     def create_pay_item_with_http_info(xero_tenant_id, pay_item, options = {})
       opts = options.dup
@@ -293,6 +304,7 @@ def create_pay_item_with_http_info(xero_tenant_id, pay_item, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -326,6 +338,7 @@ def create_pay_item_with_http_info(xero_tenant_id, pay_item, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run [Array<PayRun>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRuns]
     def create_pay_run(xero_tenant_id, pay_run, opts = {})
       data, _status_code, _headers = create_pay_run_with_http_info(xero_tenant_id, pay_run, opts)
@@ -336,6 +349,7 @@ def create_pay_run(xero_tenant_id, pay_run, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run [Array<PayRun>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRuns, Integer, Hash)>] PayRuns data, response status code and response headers
     def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
       opts = options.dup
@@ -370,6 +384,7 @@ def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -403,6 +418,7 @@ def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payroll_calendar [Array<PayrollCalendar>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayrollCalendars]
     def create_payroll_calendar(xero_tenant_id, payroll_calendar, opts = {})
       data, _status_code, _headers = create_payroll_calendar_with_http_info(xero_tenant_id, payroll_calendar, opts)
@@ -413,6 +429,7 @@ def create_payroll_calendar(xero_tenant_id, payroll_calendar, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payroll_calendar [Array<PayrollCalendar>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayrollCalendars, Integer, Hash)>] PayrollCalendars data, response status code and response headers
     def create_payroll_calendar_with_http_info(xero_tenant_id, payroll_calendar, options = {})
       opts = options.dup
@@ -447,6 +464,7 @@ def create_payroll_calendar_with_http_info(xero_tenant_id, payroll_calendar, opt
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -480,6 +498,7 @@ def create_payroll_calendar_with_http_info(xero_tenant_id, payroll_calendar, opt
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param super_fund [Array<SuperFund>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SuperFunds]
     def create_superfund(xero_tenant_id, super_fund, opts = {})
       data, _status_code, _headers = create_superfund_with_http_info(xero_tenant_id, super_fund, opts)
@@ -490,6 +509,7 @@ def create_superfund(xero_tenant_id, super_fund, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param super_fund [Array<SuperFund>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SuperFunds, Integer, Hash)>] SuperFunds data, response status code and response headers
     def create_superfund_with_http_info(xero_tenant_id, super_fund, options = {})
       opts = options.dup
@@ -524,6 +544,7 @@ def create_superfund_with_http_info(xero_tenant_id, super_fund, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -557,6 +578,7 @@ def create_superfund_with_http_info(xero_tenant_id, super_fund, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Array<Timesheet>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Timesheets]
     def create_timesheet(xero_tenant_id, timesheet, opts = {})
       data, _status_code, _headers = create_timesheet_with_http_info(xero_tenant_id, timesheet, opts)
@@ -567,6 +589,7 @@ def create_timesheet(xero_tenant_id, timesheet, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Array<Timesheet>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Timesheets, Integer, Hash)>] Timesheets data, response status code and response headers
     def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       opts = options.dup
@@ -601,6 +624,7 @@ def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1951,6 +1975,7 @@ def get_timesheets_with_http_info(xero_tenant_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application_id [String] Leave Application id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveApplications]
     def reject_leave_application(xero_tenant_id, leave_application_id, opts = {})
       data, _status_code, _headers = reject_leave_application_with_http_info(xero_tenant_id, leave_application_id, opts)
@@ -1961,6 +1986,7 @@ def reject_leave_application(xero_tenant_id, leave_application_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_application_id [String] Leave Application id for single object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveApplications, Integer, Hash)>] LeaveApplications data, response status code and response headers
     def reject_leave_application_with_http_info(xero_tenant_id, leave_application_id, options = {})
       opts = options.dup
@@ -1993,6 +2019,7 @@ def reject_leave_application_with_http_info(xero_tenant_id, leave_application_id
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2026,11 +2053,12 @@ def reject_leave_application_with_http_info(xero_tenant_id, leave_application_id
     # Update properties on a single employee
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee_id [String] Employee id for single object
+    # @param employee [Array<Employee>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<Employee>] :employee 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Employees]
-    def update_employee(xero_tenant_id, employee_id, opts = {})
-      data, _status_code, _headers = update_employee_with_http_info(xero_tenant_id, employee_id, opts)
+    def update_employee(xero_tenant_id, employee_id, employee, opts = {})
+      data, _status_code, _headers = update_employee_with_http_info(xero_tenant_id, employee_id, employee, opts)
       data
     end
 
@@ -2038,10 +2066,11 @@ def update_employee(xero_tenant_id, employee_id, opts = {})
     # Update properties on a single employee
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee_id [String] Employee id for single object
+    # @param employee [Array<Employee>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<Employee>] :employee 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Employees, Integer, Hash)>] Employees data, response status code and response headers
-    def update_employee_with_http_info(xero_tenant_id, employee_id, options = {})
+    def update_employee_with_http_info(xero_tenant_id, employee_id, employee, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: PayrollAuApi.update_employee ...'
@@ -2054,6 +2083,10 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, options = {})
       if @api_client.config.client_side_validation && employee_id.nil?
         fail ArgumentError, "Missing the required parameter 'employee_id' when calling PayrollAuApi.update_employee"
       end
+      # verify the required parameter 'employee' is set
+      if @api_client.config.client_side_validation && employee.nil?
+        fail ArgumentError, "Missing the required parameter 'employee' when calling PayrollAuApi.update_employee"
+      end
       # resource path
       local_var_path = '/Employees/{EmployeeID}'.sub('{' + 'EmployeeID' + '}', employee_id.to_s)
 
@@ -2074,12 +2107,13 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'employee']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(employee) 
 
       # return_type
       return_type = opts[:return_type] || 'Employees' 
@@ -2108,6 +2142,7 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, options = {})
     # @param leave_application_id [String] Leave Application id for single object
     # @param leave_application [Array<LeaveApplication>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveApplications]
     def update_leave_application(xero_tenant_id, leave_application_id, leave_application, opts = {})
       data, _status_code, _headers = update_leave_application_with_http_info(xero_tenant_id, leave_application_id, leave_application, opts)
@@ -2119,6 +2154,7 @@ def update_leave_application(xero_tenant_id, leave_application_id, leave_applica
     # @param leave_application_id [String] Leave Application id for single object
     # @param leave_application [Array<LeaveApplication>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveApplications, Integer, Hash)>] LeaveApplications data, response status code and response headers
     def update_leave_application_with_http_info(xero_tenant_id, leave_application_id, leave_application, options = {})
       opts = options.dup
@@ -2157,6 +2193,7 @@ def update_leave_application_with_http_info(xero_tenant_id, leave_application_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -2190,11 +2227,12 @@ def update_leave_application_with_http_info(xero_tenant_id, leave_application_id
     # Update properties on a single PayRun
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_id [String] PayRun id for single object
+    # @param pay_run [Array<PayRun>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<PayRun>] :pay_run 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRuns]
-    def update_pay_run(xero_tenant_id, pay_run_id, opts = {})
-      data, _status_code, _headers = update_pay_run_with_http_info(xero_tenant_id, pay_run_id, opts)
+    def update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts = {})
+      data, _status_code, _headers = update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, opts)
       data
     end
 
@@ -2202,10 +2240,11 @@ def update_pay_run(xero_tenant_id, pay_run_id, opts = {})
     # Update properties on a single PayRun
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_id [String] PayRun id for single object
+    # @param pay_run [Array<PayRun>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<PayRun>] :pay_run 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRuns, Integer, Hash)>] PayRuns data, response status code and response headers
-    def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, options = {})
+    def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: PayrollAuApi.update_pay_run ...'
@@ -2218,6 +2257,10 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, options = {})
       if @api_client.config.client_side_validation && pay_run_id.nil?
         fail ArgumentError, "Missing the required parameter 'pay_run_id' when calling PayrollAuApi.update_pay_run"
       end
+      # verify the required parameter 'pay_run' is set
+      if @api_client.config.client_side_validation && pay_run.nil?
+        fail ArgumentError, "Missing the required parameter 'pay_run' when calling PayrollAuApi.update_pay_run"
+      end
       # resource path
       local_var_path = '/PayRuns/{PayRunID}'.sub('{' + 'PayRunID' + '}', pay_run_id.to_s)
 
@@ -2238,12 +2281,13 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'pay_run']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(pay_run) 
 
       # return_type
       return_type = opts[:return_type] || 'PayRuns' 
@@ -2271,11 +2315,12 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, options = {})
     # Update lines on a single payslips
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payslip_id [String] Payslip id for single object
+    # @param payslip_lines [Array<PayslipLines>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<PayslipLines>] :payslip_lines 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Payslips]
-    def update_payslip(xero_tenant_id, payslip_id, opts = {})
-      data, _status_code, _headers = update_payslip_with_http_info(xero_tenant_id, payslip_id, opts)
+    def update_payslip(xero_tenant_id, payslip_id, payslip_lines, opts = {})
+      data, _status_code, _headers = update_payslip_with_http_info(xero_tenant_id, payslip_id, payslip_lines, opts)
       data
     end
 
@@ -2283,10 +2328,11 @@ def update_payslip(xero_tenant_id, payslip_id, opts = {})
     # Update lines on a single payslips
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param payslip_id [String] Payslip id for single object
+    # @param payslip_lines [Array<PayslipLines>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<PayslipLines>] :payslip_lines 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Payslips, Integer, Hash)>] Payslips data, response status code and response headers
-    def update_payslip_with_http_info(xero_tenant_id, payslip_id, options = {})
+    def update_payslip_with_http_info(xero_tenant_id, payslip_id, payslip_lines, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: PayrollAuApi.update_payslip ...'
@@ -2299,6 +2345,10 @@ def update_payslip_with_http_info(xero_tenant_id, payslip_id, options = {})
       if @api_client.config.client_side_validation && payslip_id.nil?
         fail ArgumentError, "Missing the required parameter 'payslip_id' when calling PayrollAuApi.update_payslip"
       end
+      # verify the required parameter 'payslip_lines' is set
+      if @api_client.config.client_side_validation && payslip_lines.nil?
+        fail ArgumentError, "Missing the required parameter 'payslip_lines' when calling PayrollAuApi.update_payslip"
+      end
       # resource path
       local_var_path = '/Payslip/{PayslipID}'.sub('{' + 'PayslipID' + '}', payslip_id.to_s)
 
@@ -2319,12 +2369,13 @@ def update_payslip_with_http_info(xero_tenant_id, payslip_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'payslip_lines']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(payslip_lines) 
 
       # return_type
       return_type = opts[:return_type] || 'Payslips' 
@@ -2352,11 +2403,12 @@ def update_payslip_with_http_info(xero_tenant_id, payslip_id, options = {})
     # Update properties on a single Superfund
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param super_fund_id [String] Superfund id for single object
+    # @param super_fund [Array<SuperFund>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<SuperFund>] :super_fund 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SuperFunds]
-    def update_superfund(xero_tenant_id, super_fund_id, opts = {})
-      data, _status_code, _headers = update_superfund_with_http_info(xero_tenant_id, super_fund_id, opts)
+    def update_superfund(xero_tenant_id, super_fund_id, super_fund, opts = {})
+      data, _status_code, _headers = update_superfund_with_http_info(xero_tenant_id, super_fund_id, super_fund, opts)
       data
     end
 
@@ -2364,10 +2416,11 @@ def update_superfund(xero_tenant_id, super_fund_id, opts = {})
     # Update properties on a single Superfund
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param super_fund_id [String] Superfund id for single object
+    # @param super_fund [Array<SuperFund>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<SuperFund>] :super_fund 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SuperFunds, Integer, Hash)>] SuperFunds data, response status code and response headers
-    def update_superfund_with_http_info(xero_tenant_id, super_fund_id, options = {})
+    def update_superfund_with_http_info(xero_tenant_id, super_fund_id, super_fund, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: PayrollAuApi.update_superfund ...'
@@ -2380,6 +2433,10 @@ def update_superfund_with_http_info(xero_tenant_id, super_fund_id, options = {})
       if @api_client.config.client_side_validation && super_fund_id.nil?
         fail ArgumentError, "Missing the required parameter 'super_fund_id' when calling PayrollAuApi.update_superfund"
       end
+      # verify the required parameter 'super_fund' is set
+      if @api_client.config.client_side_validation && super_fund.nil?
+        fail ArgumentError, "Missing the required parameter 'super_fund' when calling PayrollAuApi.update_superfund"
+      end
       # resource path
       local_var_path = '/Superfunds/{SuperFundID}'.sub('{' + 'SuperFundID' + '}', super_fund_id.to_s)
 
@@ -2400,12 +2457,13 @@ def update_superfund_with_http_info(xero_tenant_id, super_fund_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'super_fund']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(super_fund) 
 
       # return_type
       return_type = opts[:return_type] || 'SuperFunds' 
@@ -2433,11 +2491,12 @@ def update_superfund_with_http_info(xero_tenant_id, super_fund_id, options = {})
     # Update properties on a single timesheet
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Timesheet id for single object
+    # @param timesheet [Array<Timesheet>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<Timesheet>] :timesheet 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Timesheets]
-    def update_timesheet(xero_tenant_id, timesheet_id, opts = {})
-      data, _status_code, _headers = update_timesheet_with_http_info(xero_tenant_id, timesheet_id, opts)
+    def update_timesheet(xero_tenant_id, timesheet_id, timesheet, opts = {})
+      data, _status_code, _headers = update_timesheet_with_http_info(xero_tenant_id, timesheet_id, timesheet, opts)
       data
     end
 
@@ -2445,10 +2504,11 @@ def update_timesheet(xero_tenant_id, timesheet_id, opts = {})
     # Update properties on a single timesheet
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Timesheet id for single object
+    # @param timesheet [Array<Timesheet>] 
     # @param [Hash] opts the optional parameters
-    # @option opts [Array<Timesheet>] :timesheet 
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Timesheets, Integer, Hash)>] Timesheets data, response status code and response headers
-    def update_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
+    def update_timesheet_with_http_info(xero_tenant_id, timesheet_id, timesheet, options = {})
       opts = options.dup
       if @api_client.config.debugging
         @api_client.config.logger.debug 'Calling API: PayrollAuApi.update_timesheet ...'
@@ -2461,6 +2521,10 @@ def update_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       if @api_client.config.client_side_validation && timesheet_id.nil?
         fail ArgumentError, "Missing the required parameter 'timesheet_id' when calling PayrollAuApi.update_timesheet"
       end
+      # verify the required parameter 'timesheet' is set
+      if @api_client.config.client_side_validation && timesheet.nil?
+        fail ArgumentError, "Missing the required parameter 'timesheet' when calling PayrollAuApi.update_timesheet"
+      end
       # resource path
       local_var_path = '/Timesheets/{TimesheetID}'.sub('{' + 'TimesheetID' + '}', timesheet_id.to_s)
 
@@ -2481,12 +2545,13 @@ def update_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
 
       # http body (model)
-      post_body = opts[:body] || @api_client.object_to_http_body(opts[:'timesheet']) 
+      post_body = opts[:body] || @api_client.object_to_http_body(timesheet) 
 
       # return_type
       return_type = opts[:return_type] || 'Timesheets' 
diff --git a/lib/xero-ruby/api/payroll_nz_api.rb b/lib/xero-ruby/api/payroll_nz_api.rb
index ce9427c7..c31f0be0 100644
--- a/lib/xero-ruby/api/payroll_nz_api.rb
+++ b/lib/xero-ruby/api/payroll_nz_api.rb
@@ -20,6 +20,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def approve_timesheet(xero_tenant_id, timesheet_id, opts = {})
       data, _status_code, _headers = approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, opts)
@@ -30,6 +31,7 @@ def approve_timesheet(xero_tenant_id, timesheet_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       opts = options.dup
@@ -62,6 +64,7 @@ def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -95,6 +98,7 @@ def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param deduction [Deduction] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [DeductionObject]
     def create_deduction(xero_tenant_id, deduction, opts = {})
       data, _status_code, _headers = create_deduction_with_http_info(xero_tenant_id, deduction, opts)
@@ -105,6 +109,7 @@ def create_deduction(xero_tenant_id, deduction, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param deduction [Deduction] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(DeductionObject, Integer, Hash)>] DeductionObject data, response status code and response headers
     def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
       opts = options.dup
@@ -139,6 +144,7 @@ def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -172,6 +178,7 @@ def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param earnings_rate [EarningsRate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsRateObject]
     def create_earnings_rate(xero_tenant_id, earnings_rate, opts = {})
       data, _status_code, _headers = create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, opts)
@@ -182,6 +189,7 @@ def create_earnings_rate(xero_tenant_id, earnings_rate, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param earnings_rate [EarningsRate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsRateObject, Integer, Hash)>] EarningsRateObject data, response status code and response headers
     def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options = {})
       opts = options.dup
@@ -216,6 +224,7 @@ def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -249,6 +258,7 @@ def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options =
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeObject]
     def create_employee(xero_tenant_id, employee, opts = {})
       data, _status_code, _headers = create_employee_with_http_info(xero_tenant_id, employee, opts)
@@ -259,6 +269,7 @@ def create_employee(xero_tenant_id, employee, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeObject, Integer, Hash)>] EmployeeObject data, response status code and response headers
     def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       opts = options.dup
@@ -293,6 +304,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -327,6 +339,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsTemplateObject]
     def create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts = {})
       data, _status_code, _headers = create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, opts)
@@ -338,6 +351,7 @@ def create_employee_earnings_template(xero_tenant_id, employee_id, earnings_temp
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsTemplateObject, Integer, Hash)>] EarningsTemplateObject data, response status code and response headers
     def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, options = {})
       opts = options.dup
@@ -376,6 +390,7 @@ def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -410,6 +425,7 @@ def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
     # @param employee_id [String] Employee id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveObject]
     def create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts = {})
       data, _status_code, _headers = create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_leave, opts)
@@ -421,6 +437,7 @@ def create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts = {}
     # @param employee_id [String] Employee id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveObject, Integer, Hash)>] EmployeeLeaveObject data, response status code and response headers
     def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_leave, options = {})
       opts = options.dup
@@ -459,6 +476,7 @@ def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_l
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -493,6 +511,7 @@ def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_l
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_setup [EmployeeLeaveSetup] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveSetupObject]
     def create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setup, opts = {})
       data, _status_code, _headers = create_employee_leave_setup_with_http_info(xero_tenant_id, employee_id, employee_leave_setup, opts)
@@ -504,6 +523,7 @@ def create_employee_leave_setup(xero_tenant_id, employee_id, employee_leave_setu
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_setup [EmployeeLeaveSetup] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveSetupObject, Integer, Hash)>] EmployeeLeaveSetupObject data, response status code and response headers
     def create_employee_leave_setup_with_http_info(xero_tenant_id, employee_id, employee_leave_setup, options = {})
       opts = options.dup
@@ -542,6 +562,7 @@ def create_employee_leave_setup_with_http_info(xero_tenant_id, employee_id, empl
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -576,6 +597,7 @@ def create_employee_leave_setup_with_http_info(xero_tenant_id, employee_id, empl
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_type [EmployeeLeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveTypeObject]
     def create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts = {})
       data, _status_code, _headers = create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, employee_leave_type, opts)
@@ -587,6 +609,7 @@ def create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type,
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_type [EmployeeLeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveTypeObject, Integer, Hash)>] EmployeeLeaveTypeObject data, response status code and response headers
     def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, employee_leave_type, options = {})
       opts = options.dup
@@ -625,6 +648,7 @@ def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, emplo
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -659,6 +683,7 @@ def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, emplo
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balance [Array<EmployeeOpeningBalance>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeOpeningBalancesObject]
     def create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balance, opts = {})
       data, _status_code, _headers = create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balance, opts)
@@ -670,6 +695,7 @@ def create_employee_opening_balances(xero_tenant_id, employee_id, employee_openi
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balance [Array<EmployeeOpeningBalance>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeOpeningBalancesObject, Integer, Hash)>] EmployeeOpeningBalancesObject data, response status code and response headers
     def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balance, options = {})
       opts = options.dup
@@ -708,6 +734,7 @@ def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -742,6 +769,7 @@ def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
     # @param employee_id [String] Employee id for single object
     # @param payment_method [PaymentMethod] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PaymentMethodObject]
     def create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts = {})
       data, _status_code, _headers = create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, payment_method, opts)
@@ -753,6 +781,7 @@ def create_employee_payment_method(xero_tenant_id, employee_id, payment_method,
     # @param employee_id [String] Employee id for single object
     # @param payment_method [PaymentMethod] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PaymentMethodObject, Integer, Hash)>] PaymentMethodObject data, response status code and response headers
     def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, payment_method, options = {})
       opts = options.dup
@@ -791,6 +820,7 @@ def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, p
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -825,6 +855,7 @@ def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, p
     # @param employee_id [String] Employee id for single object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SalaryAndWageObject]
     def create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts = {})
       data, _status_code, _headers = create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wage, opts)
@@ -836,6 +867,7 @@ def create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage
     # @param employee_id [String] Employee id for single object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SalaryAndWageObject, Integer, Hash)>] SalaryAndWageObject data, response status code and response headers
     def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wage, options = {})
       opts = options.dup
@@ -874,6 +906,7 @@ def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -908,6 +941,7 @@ def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
     # @param employee_id [String] Employee id for single object
     # @param employment [Employment] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmploymentObject]
     def create_employment(xero_tenant_id, employee_id, employment, opts = {})
       data, _status_code, _headers = create_employment_with_http_info(xero_tenant_id, employee_id, employment, opts)
@@ -919,6 +953,7 @@ def create_employment(xero_tenant_id, employee_id, employment, opts = {})
     # @param employee_id [String] Employee id for single object
     # @param employment [Employment] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmploymentObject, Integer, Hash)>] EmploymentObject data, response status code and response headers
     def create_employment_with_http_info(xero_tenant_id, employee_id, employment, options = {})
       opts = options.dup
@@ -957,6 +992,7 @@ def create_employment_with_http_info(xero_tenant_id, employee_id, employment, op
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -990,6 +1026,7 @@ def create_employment_with_http_info(xero_tenant_id, employee_id, employment, op
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_type [LeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveTypeObject]
     def create_leave_type(xero_tenant_id, leave_type, opts = {})
       data, _status_code, _headers = create_leave_type_with_http_info(xero_tenant_id, leave_type, opts)
@@ -1000,6 +1037,7 @@ def create_leave_type(xero_tenant_id, leave_type, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_type [LeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveTypeObject, Integer, Hash)>] LeaveTypeObject data, response status code and response headers
     def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
       opts = options.dup
@@ -1034,6 +1072,7 @@ def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1068,6 +1107,7 @@ def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [Array<EarningsTemplate>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeEarningsTemplates]
     def create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts = {})
       data, _status_code, _headers = create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, opts)
@@ -1079,6 +1119,7 @@ def create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earn
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [Array<EarningsTemplate>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeEarningsTemplates, Integer, Hash)>] EmployeeEarningsTemplates data, response status code and response headers
     def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, options = {})
       opts = options.dup
@@ -1117,6 +1158,7 @@ def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, em
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1150,6 +1192,7 @@ def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, em
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRunObject]
     def create_pay_run(xero_tenant_id, pay_run, opts = {})
       data, _status_code, _headers = create_pay_run_with_http_info(xero_tenant_id, pay_run, opts)
@@ -1160,6 +1203,7 @@ def create_pay_run(xero_tenant_id, pay_run, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRunObject, Integer, Hash)>] PayRunObject data, response status code and response headers
     def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
       opts = options.dup
@@ -1194,6 +1238,7 @@ def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1227,6 +1272,7 @@ def create_pay_run_with_http_info(xero_tenant_id, pay_run, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_calendar [PayRunCalendar] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRunCalendarObject]
     def create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts = {})
       data, _status_code, _headers = create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opts)
@@ -1237,6 +1283,7 @@ def create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_calendar [PayRunCalendar] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRunCalendarObject, Integer, Hash)>] PayRunCalendarObject data, response status code and response headers
     def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, options = {})
       opts = options.dup
@@ -1271,6 +1318,7 @@ def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opt
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1304,6 +1352,7 @@ def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opt
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param reimbursement [Reimbursement] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ReimbursementObject]
     def create_reimbursement(xero_tenant_id, reimbursement, opts = {})
       data, _status_code, _headers = create_reimbursement_with_http_info(xero_tenant_id, reimbursement, opts)
@@ -1314,6 +1363,7 @@ def create_reimbursement(xero_tenant_id, reimbursement, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param reimbursement [Reimbursement] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ReimbursementObject, Integer, Hash)>] ReimbursementObject data, response status code and response headers
     def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options = {})
       opts = options.dup
@@ -1348,6 +1398,7 @@ def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1381,6 +1432,7 @@ def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options =
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param benefit [Benefit] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SuperannuationObject]
     def create_superannuation(xero_tenant_id, benefit, opts = {})
       data, _status_code, _headers = create_superannuation_with_http_info(xero_tenant_id, benefit, opts)
@@ -1391,6 +1443,7 @@ def create_superannuation(xero_tenant_id, benefit, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param benefit [Benefit] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SuperannuationObject, Integer, Hash)>] SuperannuationObject data, response status code and response headers
     def create_superannuation_with_http_info(xero_tenant_id, benefit, options = {})
       opts = options.dup
@@ -1425,6 +1478,7 @@ def create_superannuation_with_http_info(xero_tenant_id, benefit, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1458,6 +1512,7 @@ def create_superannuation_with_http_info(xero_tenant_id, benefit, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Timesheet] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def create_timesheet(xero_tenant_id, timesheet, opts = {})
       data, _status_code, _headers = create_timesheet_with_http_info(xero_tenant_id, timesheet, opts)
@@ -1468,6 +1523,7 @@ def create_timesheet(xero_tenant_id, timesheet, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Timesheet] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       opts = options.dup
@@ -1502,6 +1558,7 @@ def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1536,6 +1593,7 @@ def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
     # @param timesheet_id [String] Identifier for the timesheet
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetLineObject]
     def create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts = {})
       data, _status_code, _headers = create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line, opts)
@@ -1547,6 +1605,7 @@ def create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts = {
     # @param timesheet_id [String] Identifier for the timesheet
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetLineObject, Integer, Hash)>] TimesheetLineObject data, response status code and response headers
     def create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line, options = {})
       opts = options.dup
@@ -1585,6 +1644,7 @@ def create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4572,6 +4632,7 @@ def get_tracking_categories_with_http_info(xero_tenant_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def revert_timesheet(xero_tenant_id, timesheet_id, opts = {})
       data, _status_code, _headers = revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, opts)
@@ -4582,6 +4643,7 @@ def revert_timesheet(xero_tenant_id, timesheet_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       opts = options.dup
@@ -4614,6 +4676,7 @@ def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4648,6 +4711,7 @@ def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
     # @param employee_id [String] Employee id for single object
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeObject]
     def update_employee(xero_tenant_id, employee_id, employee, opts = {})
       data, _status_code, _headers = update_employee_with_http_info(xero_tenant_id, employee_id, employee, opts)
@@ -4659,6 +4723,7 @@ def update_employee(xero_tenant_id, employee_id, employee, opts = {})
     # @param employee_id [String] Employee id for single object
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeObject, Integer, Hash)>] EmployeeObject data, response status code and response headers
     def update_employee_with_http_info(xero_tenant_id, employee_id, employee, options = {})
       opts = options.dup
@@ -4697,6 +4762,7 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, employee, option
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4732,6 +4798,7 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, employee, option
     # @param pay_template_earning_id [String] Id for single pay template earnings object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsTemplateObject]
     def update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts = {})
       data, _status_code, _headers = update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
@@ -4744,6 +4811,7 @@ def update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_
     # @param pay_template_earning_id [String] Id for single pay template earnings object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsTemplateObject, Integer, Hash)>] EarningsTemplateObject data, response status code and response headers
     def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, options = {})
       opts = options.dup
@@ -4786,6 +4854,7 @@ def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4821,6 +4890,7 @@ def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
     # @param leave_id [String] Leave id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveObject]
     def update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts = {})
       data, _status_code, _headers = update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
@@ -4833,6 +4903,7 @@ def update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave,
     # @param leave_id [String] Leave id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveObject, Integer, Hash)>] EmployeeLeaveObject data, response status code and response headers
     def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id, employee_leave, options = {})
       opts = options.dup
@@ -4875,6 +4946,7 @@ def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4910,6 +4982,7 @@ def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id,
     # @param salary_and_wages_id [String] Id for single pay template earnings object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SalaryAndWageObject]
     def update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts = {})
       data, _status_code, _headers = update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
@@ -4922,6 +4995,7 @@ def update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage
     # @param salary_and_wages_id [String] Id for single pay template earnings object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SalaryAndWageObject, Integer, Hash)>] SalaryAndWageObject data, response status code and response headers
     def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, options = {})
       opts = options.dup
@@ -4964,6 +5038,7 @@ def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4998,6 +5073,7 @@ def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
     # @param employee_id [String] Employee id for single object
     # @param employee_tax [EmployeeTax] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeTaxObject]
     def update_employee_tax(xero_tenant_id, employee_id, employee_tax, opts = {})
       data, _status_code, _headers = update_employee_tax_with_http_info(xero_tenant_id, employee_id, employee_tax, opts)
@@ -5009,6 +5085,7 @@ def update_employee_tax(xero_tenant_id, employee_id, employee_tax, opts = {})
     # @param employee_id [String] Employee id for single object
     # @param employee_tax [EmployeeTax] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeTaxObject, Integer, Hash)>] EmployeeTaxObject data, response status code and response headers
     def update_employee_tax_with_http_info(xero_tenant_id, employee_id, employee_tax, options = {})
       opts = options.dup
@@ -5047,6 +5124,7 @@ def update_employee_tax_with_http_info(xero_tenant_id, employee_id, employee_tax
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5081,6 +5159,7 @@ def update_employee_tax_with_http_info(xero_tenant_id, employee_id, employee_tax
     # @param pay_run_id [String] Identifier for the pay run
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRunObject]
     def update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts = {})
       data, _status_code, _headers = update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, opts)
@@ -5092,6 +5171,7 @@ def update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts = {})
     # @param pay_run_id [String] Identifier for the pay run
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRunObject, Integer, Hash)>] PayRunObject data, response status code and response headers
     def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options = {})
       opts = options.dup
@@ -5130,6 +5210,7 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5164,6 +5245,7 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options =
     # @param pay_slip_id [String] Identifier for the payslip
     # @param pay_slip [PaySlip] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PaySlipObject]
     def update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip, opts = {})
       data, _status_code, _headers = update_pay_slip_line_items_with_http_info(xero_tenant_id, pay_slip_id, pay_slip, opts)
@@ -5175,6 +5257,7 @@ def update_pay_slip_line_items(xero_tenant_id, pay_slip_id, pay_slip, opts = {})
     # @param pay_slip_id [String] Identifier for the payslip
     # @param pay_slip [PaySlip] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PaySlipObject, Integer, Hash)>] PaySlipObject data, response status code and response headers
     def update_pay_slip_line_items_with_http_info(xero_tenant_id, pay_slip_id, pay_slip, options = {})
       opts = options.dup
@@ -5213,6 +5296,7 @@ def update_pay_slip_line_items_with_http_info(xero_tenant_id, pay_slip_id, pay_s
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5248,6 +5332,7 @@ def update_pay_slip_line_items_with_http_info(xero_tenant_id, pay_slip_id, pay_s
     # @param timesheet_line_id [String] Identifier for the timesheet line
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetLineObject]
     def update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts = {})
       data, _status_code, _headers = update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
@@ -5260,6 +5345,7 @@ def update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, times
     # @param timesheet_line_id [String] Identifier for the timesheet line
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetLineObject, Integer, Hash)>] TimesheetLineObject data, response status code and response headers
     def update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, options = {})
       opts = options.dup
@@ -5302,6 +5388,7 @@ def update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/api/payroll_uk_api.rb b/lib/xero-ruby/api/payroll_uk_api.rb
index ad2599b9..a0bacfa7 100644
--- a/lib/xero-ruby/api/payroll_uk_api.rb
+++ b/lib/xero-ruby/api/payroll_uk_api.rb
@@ -20,6 +20,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def approve_timesheet(xero_tenant_id, timesheet_id, opts = {})
       data, _status_code, _headers = approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, opts)
@@ -30,6 +31,7 @@ def approve_timesheet(xero_tenant_id, timesheet_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       opts = options.dup
@@ -62,6 +64,7 @@ def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -95,6 +98,7 @@ def approve_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param benefit [Benefit] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [BenefitObject]
     def create_benefit(xero_tenant_id, benefit, opts = {})
       data, _status_code, _headers = create_benefit_with_http_info(xero_tenant_id, benefit, opts)
@@ -105,6 +109,7 @@ def create_benefit(xero_tenant_id, benefit, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param benefit [Benefit] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(BenefitObject, Integer, Hash)>] BenefitObject data, response status code and response headers
     def create_benefit_with_http_info(xero_tenant_id, benefit, options = {})
       opts = options.dup
@@ -139,6 +144,7 @@ def create_benefit_with_http_info(xero_tenant_id, benefit, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -172,6 +178,7 @@ def create_benefit_with_http_info(xero_tenant_id, benefit, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param deduction [Deduction] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [DeductionObject]
     def create_deduction(xero_tenant_id, deduction, opts = {})
       data, _status_code, _headers = create_deduction_with_http_info(xero_tenant_id, deduction, opts)
@@ -182,6 +189,7 @@ def create_deduction(xero_tenant_id, deduction, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param deduction [Deduction] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(DeductionObject, Integer, Hash)>] DeductionObject data, response status code and response headers
     def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
       opts = options.dup
@@ -216,6 +224,7 @@ def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -249,6 +258,7 @@ def create_deduction_with_http_info(xero_tenant_id, deduction, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param earnings_rate [EarningsRate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsRateObject]
     def create_earnings_rate(xero_tenant_id, earnings_rate, opts = {})
       data, _status_code, _headers = create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, opts)
@@ -259,6 +269,7 @@ def create_earnings_rate(xero_tenant_id, earnings_rate, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param earnings_rate [EarningsRate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsRateObject, Integer, Hash)>] EarningsRateObject data, response status code and response headers
     def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options = {})
       opts = options.dup
@@ -293,6 +304,7 @@ def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -326,6 +338,7 @@ def create_earnings_rate_with_http_info(xero_tenant_id, earnings_rate, options =
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeObject]
     def create_employee(xero_tenant_id, employee, opts = {})
       data, _status_code, _headers = create_employee_with_http_info(xero_tenant_id, employee, opts)
@@ -336,6 +349,7 @@ def create_employee(xero_tenant_id, employee, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeObject, Integer, Hash)>] EmployeeObject data, response status code and response headers
     def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       opts = options.dup
@@ -370,6 +384,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -404,6 +419,7 @@ def create_employee_with_http_info(xero_tenant_id, employee, options = {})
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsTemplateObject]
     def create_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts = {})
       data, _status_code, _headers = create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, opts)
@@ -415,6 +431,7 @@ def create_employee_earnings_template(xero_tenant_id, employee_id, earnings_temp
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsTemplateObject, Integer, Hash)>] EarningsTemplateObject data, response status code and response headers
     def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, options = {})
       opts = options.dup
@@ -453,6 +470,7 @@ def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -487,6 +505,7 @@ def create_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
     # @param employee_id [String] Employee id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveObject]
     def create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts = {})
       data, _status_code, _headers = create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_leave, opts)
@@ -498,6 +517,7 @@ def create_employee_leave(xero_tenant_id, employee_id, employee_leave, opts = {}
     # @param employee_id [String] Employee id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveObject, Integer, Hash)>] EmployeeLeaveObject data, response status code and response headers
     def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_leave, options = {})
       opts = options.dup
@@ -536,6 +556,7 @@ def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_l
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -570,6 +591,7 @@ def create_employee_leave_with_http_info(xero_tenant_id, employee_id, employee_l
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_type [EmployeeLeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveTypeObject]
     def create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type, opts = {})
       data, _status_code, _headers = create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, employee_leave_type, opts)
@@ -581,6 +603,7 @@ def create_employee_leave_type(xero_tenant_id, employee_id, employee_leave_type,
     # @param employee_id [String] Employee id for single object
     # @param employee_leave_type [EmployeeLeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveTypeObject, Integer, Hash)>] EmployeeLeaveTypeObject data, response status code and response headers
     def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, employee_leave_type, options = {})
       opts = options.dup
@@ -619,6 +642,7 @@ def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, emplo
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -653,6 +677,7 @@ def create_employee_leave_type_with_http_info(xero_tenant_id, employee_id, emplo
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balances [EmployeeOpeningBalances] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeOpeningBalancesObject]
     def create_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts = {})
       data, _status_code, _headers = create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balances, opts)
@@ -664,6 +689,7 @@ def create_employee_opening_balances(xero_tenant_id, employee_id, employee_openi
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balances [EmployeeOpeningBalances] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeOpeningBalancesObject, Integer, Hash)>] EmployeeOpeningBalancesObject data, response status code and response headers
     def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balances, options = {})
       opts = options.dup
@@ -702,6 +728,7 @@ def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -736,6 +763,7 @@ def create_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
     # @param employee_id [String] Employee id for single object
     # @param payment_method [PaymentMethod] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PaymentMethodObject]
     def create_employee_payment_method(xero_tenant_id, employee_id, payment_method, opts = {})
       data, _status_code, _headers = create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, payment_method, opts)
@@ -747,6 +775,7 @@ def create_employee_payment_method(xero_tenant_id, employee_id, payment_method,
     # @param employee_id [String] Employee id for single object
     # @param payment_method [PaymentMethod] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PaymentMethodObject, Integer, Hash)>] PaymentMethodObject data, response status code and response headers
     def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, payment_method, options = {})
       opts = options.dup
@@ -785,6 +814,7 @@ def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, p
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -819,6 +849,7 @@ def create_employee_payment_method_with_http_info(xero_tenant_id, employee_id, p
     # @param employee_id [String] Employee id for single object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SalaryAndWageObject]
     def create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage, opts = {})
       data, _status_code, _headers = create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wage, opts)
@@ -830,6 +861,7 @@ def create_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage
     # @param employee_id [String] Employee id for single object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SalaryAndWageObject, Integer, Hash)>] SalaryAndWageObject data, response status code and response headers
     def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wage, options = {})
       opts = options.dup
@@ -868,6 +900,7 @@ def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -901,6 +934,7 @@ def create_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee_statutory_sick_leave [EmployeeStatutorySickLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeStatutorySickLeaveObject]
     def create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick_leave, opts = {})
       data, _status_code, _headers = create_employee_statutory_sick_leave_with_http_info(xero_tenant_id, employee_statutory_sick_leave, opts)
@@ -911,6 +945,7 @@ def create_employee_statutory_sick_leave(xero_tenant_id, employee_statutory_sick
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param employee_statutory_sick_leave [EmployeeStatutorySickLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeStatutorySickLeaveObject, Integer, Hash)>] EmployeeStatutorySickLeaveObject data, response status code and response headers
     def create_employee_statutory_sick_leave_with_http_info(xero_tenant_id, employee_statutory_sick_leave, options = {})
       opts = options.dup
@@ -945,6 +980,7 @@ def create_employee_statutory_sick_leave_with_http_info(xero_tenant_id, employee
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -979,6 +1015,7 @@ def create_employee_statutory_sick_leave_with_http_info(xero_tenant_id, employee
     # @param employee_id [String] Employee id for single object
     # @param employment [Employment] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmploymentObject]
     def create_employment(xero_tenant_id, employee_id, employment, opts = {})
       data, _status_code, _headers = create_employment_with_http_info(xero_tenant_id, employee_id, employment, opts)
@@ -990,6 +1027,7 @@ def create_employment(xero_tenant_id, employee_id, employment, opts = {})
     # @param employee_id [String] Employee id for single object
     # @param employment [Employment] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmploymentObject, Integer, Hash)>] EmploymentObject data, response status code and response headers
     def create_employment_with_http_info(xero_tenant_id, employee_id, employment, options = {})
       opts = options.dup
@@ -1028,6 +1066,7 @@ def create_employment_with_http_info(xero_tenant_id, employee_id, employment, op
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1061,6 +1100,7 @@ def create_employment_with_http_info(xero_tenant_id, employee_id, employment, op
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_type [LeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [LeaveTypeObject]
     def create_leave_type(xero_tenant_id, leave_type, opts = {})
       data, _status_code, _headers = create_leave_type_with_http_info(xero_tenant_id, leave_type, opts)
@@ -1071,6 +1111,7 @@ def create_leave_type(xero_tenant_id, leave_type, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param leave_type [LeaveType] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(LeaveTypeObject, Integer, Hash)>] LeaveTypeObject data, response status code and response headers
     def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
       opts = options.dup
@@ -1105,6 +1146,7 @@ def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1139,6 +1181,7 @@ def create_leave_type_with_http_info(xero_tenant_id, leave_type, options = {})
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [Array<EarningsTemplate>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeePayTemplates]
     def create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earnings_template, opts = {})
       data, _status_code, _headers = create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, opts)
@@ -1150,6 +1193,7 @@ def create_multiple_employee_earnings_template(xero_tenant_id, employee_id, earn
     # @param employee_id [String] Employee id for single object
     # @param earnings_template [Array<EarningsTemplate>] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeePayTemplates, Integer, Hash)>] EmployeePayTemplates data, response status code and response headers
     def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, earnings_template, options = {})
       opts = options.dup
@@ -1188,6 +1232,7 @@ def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, em
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1221,6 +1266,7 @@ def create_multiple_employee_earnings_template_with_http_info(xero_tenant_id, em
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_calendar [PayRunCalendar] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRunCalendarObject]
     def create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts = {})
       data, _status_code, _headers = create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opts)
@@ -1231,6 +1277,7 @@ def create_pay_run_calendar(xero_tenant_id, pay_run_calendar, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param pay_run_calendar [PayRunCalendar] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRunCalendarObject, Integer, Hash)>] PayRunCalendarObject data, response status code and response headers
     def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, options = {})
       opts = options.dup
@@ -1265,6 +1312,7 @@ def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opt
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1298,6 +1346,7 @@ def create_pay_run_calendar_with_http_info(xero_tenant_id, pay_run_calendar, opt
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param reimbursement [Reimbursement] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [ReimbursementObject]
     def create_reimbursement(xero_tenant_id, reimbursement, opts = {})
       data, _status_code, _headers = create_reimbursement_with_http_info(xero_tenant_id, reimbursement, opts)
@@ -1308,6 +1357,7 @@ def create_reimbursement(xero_tenant_id, reimbursement, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param reimbursement [Reimbursement] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(ReimbursementObject, Integer, Hash)>] ReimbursementObject data, response status code and response headers
     def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options = {})
       opts = options.dup
@@ -1342,6 +1392,7 @@ def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1375,6 +1426,7 @@ def create_reimbursement_with_http_info(xero_tenant_id, reimbursement, options =
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Timesheet] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def create_timesheet(xero_tenant_id, timesheet, opts = {})
       data, _status_code, _headers = create_timesheet_with_http_info(xero_tenant_id, timesheet, opts)
@@ -1385,6 +1437,7 @@ def create_timesheet(xero_tenant_id, timesheet, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet [Timesheet] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       opts = options.dup
@@ -1419,6 +1472,7 @@ def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1453,6 +1507,7 @@ def create_timesheet_with_http_info(xero_tenant_id, timesheet, options = {})
     # @param timesheet_id [String] Identifier for the timesheet
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetLineObject]
     def create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts = {})
       data, _status_code, _headers = create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line, opts)
@@ -1464,6 +1519,7 @@ def create_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line, opts = {
     # @param timesheet_id [String] Identifier for the timesheet
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetLineObject, Integer, Hash)>] TimesheetLineObject data, response status code and response headers
     def create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line, options = {})
       opts = options.dup
@@ -1502,6 +1558,7 @@ def create_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4800,6 +4857,7 @@ def get_tracking_categories_with_http_info(xero_tenant_id, options = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetObject]
     def revert_timesheet(xero_tenant_id, timesheet_id, opts = {})
       data, _status_code, _headers = revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, opts)
@@ -4810,6 +4868,7 @@ def revert_timesheet(xero_tenant_id, timesheet_id, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param timesheet_id [String] Identifier for the timesheet
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetObject, Integer, Hash)>] TimesheetObject data, response status code and response headers
     def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       opts = options.dup
@@ -4842,6 +4901,7 @@ def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
       # HTTP header 'Accept' (if needed)
       header_params['Accept'] = @api_client.select_header_accept(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4876,6 +4936,7 @@ def revert_timesheet_with_http_info(xero_tenant_id, timesheet_id, options = {})
     # @param employee_id [String] Employee id for single object
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeObject]
     def update_employee(xero_tenant_id, employee_id, employee, opts = {})
       data, _status_code, _headers = update_employee_with_http_info(xero_tenant_id, employee_id, employee, opts)
@@ -4887,6 +4948,7 @@ def update_employee(xero_tenant_id, employee_id, employee, opts = {})
     # @param employee_id [String] Employee id for single object
     # @param employee [Employee] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeObject, Integer, Hash)>] EmployeeObject data, response status code and response headers
     def update_employee_with_http_info(xero_tenant_id, employee_id, employee, options = {})
       opts = options.dup
@@ -4925,6 +4987,7 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, employee, option
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -4960,6 +5023,7 @@ def update_employee_with_http_info(xero_tenant_id, employee_id, employee, option
     # @param pay_template_earning_id [String] Id for single pay template earnings object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EarningsTemplateObject]
     def update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts = {})
       data, _status_code, _headers = update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, opts)
@@ -4972,6 +5036,7 @@ def update_employee_earnings_template(xero_tenant_id, employee_id, pay_template_
     # @param pay_template_earning_id [String] Id for single pay template earnings object
     # @param earnings_template [EarningsTemplate] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EarningsTemplateObject, Integer, Hash)>] EarningsTemplateObject data, response status code and response headers
     def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id, pay_template_earning_id, earnings_template, options = {})
       opts = options.dup
@@ -5014,6 +5079,7 @@ def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5049,6 +5115,7 @@ def update_employee_earnings_template_with_http_info(xero_tenant_id, employee_id
     # @param leave_id [String] Leave id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeLeaveObject]
     def update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave, opts = {})
       data, _status_code, _headers = update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id, employee_leave, opts)
@@ -5061,6 +5128,7 @@ def update_employee_leave(xero_tenant_id, employee_id, leave_id, employee_leave,
     # @param leave_id [String] Leave id for single object
     # @param employee_leave [EmployeeLeave] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeLeaveObject, Integer, Hash)>] EmployeeLeaveObject data, response status code and response headers
     def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id, employee_leave, options = {})
       opts = options.dup
@@ -5103,6 +5171,7 @@ def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5137,6 +5206,7 @@ def update_employee_leave_with_http_info(xero_tenant_id, employee_id, leave_id,
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balances [EmployeeOpeningBalances] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [EmployeeOpeningBalancesObject]
     def update_employee_opening_balances(xero_tenant_id, employee_id, employee_opening_balances, opts = {})
       data, _status_code, _headers = update_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balances, opts)
@@ -5148,6 +5218,7 @@ def update_employee_opening_balances(xero_tenant_id, employee_id, employee_openi
     # @param employee_id [String] Employee id for single object
     # @param employee_opening_balances [EmployeeOpeningBalances] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(EmployeeOpeningBalancesObject, Integer, Hash)>] EmployeeOpeningBalancesObject data, response status code and response headers
     def update_employee_opening_balances_with_http_info(xero_tenant_id, employee_id, employee_opening_balances, options = {})
       opts = options.dup
@@ -5186,6 +5257,7 @@ def update_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5221,6 +5293,7 @@ def update_employee_opening_balances_with_http_info(xero_tenant_id, employee_id,
     # @param salary_and_wages_id [String] Id for single pay template earnings object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [SalaryAndWageObject]
     def update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts = {})
       data, _status_code, _headers = update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, opts)
@@ -5233,6 +5306,7 @@ def update_employee_salary_and_wage(xero_tenant_id, employee_id, salary_and_wage
     # @param salary_and_wages_id [String] Id for single pay template earnings object
     # @param salary_and_wage [SalaryAndWage] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(SalaryAndWageObject, Integer, Hash)>] SalaryAndWageObject data, response status code and response headers
     def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id, salary_and_wages_id, salary_and_wage, options = {})
       opts = options.dup
@@ -5275,6 +5349,7 @@ def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5309,6 +5384,7 @@ def update_employee_salary_and_wage_with_http_info(xero_tenant_id, employee_id,
     # @param pay_run_id [String] Identifier for the pay run
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [PayRunObject]
     def update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts = {})
       data, _status_code, _headers = update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, opts)
@@ -5320,6 +5396,7 @@ def update_pay_run(xero_tenant_id, pay_run_id, pay_run, opts = {})
     # @param pay_run_id [String] Identifier for the pay run
     # @param pay_run [PayRun] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(PayRunObject, Integer, Hash)>] PayRunObject data, response status code and response headers
     def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options = {})
       opts = options.dup
@@ -5358,6 +5435,7 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options =
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -5393,6 +5471,7 @@ def update_pay_run_with_http_info(xero_tenant_id, pay_run_id, pay_run, options =
     # @param timesheet_line_id [String] Identifier for the timesheet line
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimesheetLineObject]
     def update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts = {})
       data, _status_code, _headers = update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, opts)
@@ -5405,6 +5484,7 @@ def update_timesheet_line(xero_tenant_id, timesheet_id, timesheet_line_id, times
     # @param timesheet_line_id [String] Identifier for the timesheet line
     # @param timesheet_line [TimesheetLine] 
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimesheetLineObject, Integer, Hash)>] TimesheetLineObject data, response status code and response headers
     def update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet_line_id, timesheet_line, options = {})
       opts = options.dup
@@ -5447,6 +5527,7 @@ def update_timesheet_line_with_http_info(xero_tenant_id, timesheet_id, timesheet
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/api/project_api.rb b/lib/xero-ruby/api/project_api.rb
index 998a5ca2..3b6a712b 100644
--- a/lib/xero-ruby/api/project_api.rb
+++ b/lib/xero-ruby/api/project_api.rb
@@ -20,6 +20,7 @@ def initialize(api_client = ApiClient.new)
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param project_create_or_update [ProjectCreateOrUpdate] Create a new project with ProjectCreateOrUpdate object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Project]
     def create_project(xero_tenant_id, project_create_or_update, opts = {})
       data, _status_code, _headers = create_project_with_http_info(xero_tenant_id, project_create_or_update, opts)
@@ -30,6 +31,7 @@ def create_project(xero_tenant_id, project_create_or_update, opts = {})
     # @param xero_tenant_id [String] Xero identifier for Tenant
     # @param project_create_or_update [ProjectCreateOrUpdate] Create a new project with ProjectCreateOrUpdate object
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Project, Integer, Hash)>] Project data, response status code and response headers
     def create_project_with_http_info(xero_tenant_id, project_create_or_update, options = {})
       opts = options.dup
@@ -64,6 +66,7 @@ def create_project_with_http_info(xero_tenant_id, project_create_or_update, opti
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -99,6 +102,7 @@ def create_project_with_http_info(xero_tenant_id, project_create_or_update, opti
     # @param project_id [String] You can create a task on a specified projectId
     # @param task_create_or_update [TaskCreateOrUpdate] The task object you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Task]
     def create_task(xero_tenant_id, project_id, task_create_or_update, opts = {})
       data, _status_code, _headers = create_task_with_http_info(xero_tenant_id, project_id, task_create_or_update, opts)
@@ -111,6 +115,7 @@ def create_task(xero_tenant_id, project_id, task_create_or_update, opts = {})
     # @param project_id [String] You can create a task on a specified projectId
     # @param task_create_or_update [TaskCreateOrUpdate] The task object you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(Task, Integer, Hash)>] Task data, response status code and response headers
     def create_task_with_http_info(xero_tenant_id, project_id, task_create_or_update, options = {})
       opts = options.dup
@@ -149,6 +154,7 @@ def create_task_with_http_info(xero_tenant_id, project_id, task_create_or_update
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -184,6 +190,7 @@ def create_task_with_http_info(xero_tenant_id, project_id, task_create_or_update
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param time_entry_create_or_update [TimeEntryCreateOrUpdate] The time entry object you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [TimeEntry]
     def create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update, opts = {})
       data, _status_code, _headers = create_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_create_or_update, opts)
@@ -196,6 +203,7 @@ def create_time_entry(xero_tenant_id, project_id, time_entry_create_or_update, o
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param time_entry_create_or_update [TimeEntryCreateOrUpdate] The time entry object you are creating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(TimeEntry, Integer, Hash)>] TimeEntry data, response status code and response headers
     def create_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_create_or_update, options = {})
       opts = options.dup
@@ -234,6 +242,7 @@ def create_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_crea
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1053,6 +1062,7 @@ def get_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_id, opt
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param project_patch [ProjectPatch] Update the status of an existing Project
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [nil]
     def patch_project(xero_tenant_id, project_id, project_patch, opts = {})
       patch_project_with_http_info(xero_tenant_id, project_id, project_patch, opts)
@@ -1065,6 +1075,7 @@ def patch_project(xero_tenant_id, project_id, project_patch, opts = {})
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param project_patch [ProjectPatch] Update the status of an existing Project
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(nil, Integer, Hash)>] nil, response status code and response headers
     def patch_project_with_http_info(xero_tenant_id, project_id, project_patch, options = {})
       opts = options.dup
@@ -1103,6 +1114,7 @@ def patch_project_with_http_info(xero_tenant_id, project_id, project_patch, opti
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1138,6 +1150,7 @@ def patch_project_with_http_info(xero_tenant_id, project_id, project_patch, opti
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param project_create_or_update [ProjectCreateOrUpdate] Request of type ProjectCreateOrUpdate
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [nil]
     def update_project(xero_tenant_id, project_id, project_create_or_update, opts = {})
       update_project_with_http_info(xero_tenant_id, project_id, project_create_or_update, opts)
@@ -1150,6 +1163,7 @@ def update_project(xero_tenant_id, project_id, project_create_or_update, opts =
     # @param project_id [String] You can specify an individual project by appending the projectId to the endpoint
     # @param project_create_or_update [ProjectCreateOrUpdate] Request of type ProjectCreateOrUpdate
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(nil, Integer, Hash)>] nil, response status code and response headers
     def update_project_with_http_info(xero_tenant_id, project_id, project_create_or_update, options = {})
       opts = options.dup
@@ -1188,6 +1202,7 @@ def update_project_with_http_info(xero_tenant_id, project_id, project_create_or_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1224,6 +1239,7 @@ def update_project_with_http_info(xero_tenant_id, project_id, project_create_or_
     # @param task_id [String] You can specify an individual task by appending the id to the endpoint
     # @param task_create_or_update [TaskCreateOrUpdate] The task object you are updating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [nil]
     def update_task(xero_tenant_id, project_id, task_id, task_create_or_update, opts = {})
       update_task_with_http_info(xero_tenant_id, project_id, task_id, task_create_or_update, opts)
@@ -1237,6 +1253,7 @@ def update_task(xero_tenant_id, project_id, task_id, task_create_or_update, opts
     # @param task_id [String] You can specify an individual task by appending the id to the endpoint
     # @param task_create_or_update [TaskCreateOrUpdate] The task object you are updating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(nil, Integer, Hash)>] nil, response status code and response headers
     def update_task_with_http_info(xero_tenant_id, project_id, task_id, task_create_or_update, options = {})
       opts = options.dup
@@ -1279,6 +1296,7 @@ def update_task_with_http_info(xero_tenant_id, project_id, task_id, task_create_
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
@@ -1315,6 +1333,7 @@ def update_task_with_http_info(xero_tenant_id, project_id, task_id, task_create_
     # @param time_entry_id [String] You can specify an individual time entry by appending the id to the endpoint
     # @param time_entry_create_or_update [TimeEntryCreateOrUpdate] The time entry object you are updating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [nil]
     def update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update, opts = {})
       update_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update, opts)
@@ -1328,6 +1347,7 @@ def update_time_entry(xero_tenant_id, project_id, time_entry_id, time_entry_crea
     # @param time_entry_id [String] You can specify an individual time entry by appending the id to the endpoint
     # @param time_entry_create_or_update [TimeEntryCreateOrUpdate] The time entry object you are updating
     # @param [Hash] opts the optional parameters
+    # @option opts [String] :idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max.
     # @return [Array<(nil, Integer, Hash)>] nil, response status code and response headers
     def update_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_id, time_entry_create_or_update, options = {})
       opts = options.dup
@@ -1370,6 +1390,7 @@ def update_time_entry_with_http_info(xero_tenant_id, project_id, time_entry_id,
       # HTTP header 'Content-Type'
       header_params['Content-Type'] = @api_client.select_header_content_type(['application/json'])
       header_params[:'Xero-Tenant-Id'] = xero_tenant_id
+      header_params[:'Idempotency-Key'] = opts[:'idempotency_key'] if !opts[:'idempotency_key'].nil?
 
       # form parameters
       form_params = opts[:form_params] || {}
diff --git a/lib/xero-ruby/models/accounting/account_type.rb b/lib/xero-ruby/models/accounting/account_type.rb
index ca1473a4..e5323d2a 100644
--- a/lib/xero-ruby/models/accounting/account_type.rb
+++ b/lib/xero-ruby/models/accounting/account_type.rb
@@ -31,11 +31,7 @@ class AccountType
     REVENUE ||= "REVENUE".freeze
     SALES ||= "SALES".freeze
     TERMLIAB ||= "TERMLIAB".freeze
-    PAYGLIABILITY ||= "PAYGLIABILITY".freeze
     PAYG ||= "PAYG".freeze
-    SUPERANNUATIONEXPENSE ||= "SUPERANNUATIONEXPENSE".freeze
-    SUPERANNUATIONLIABILITY ||= "SUPERANNUATIONLIABILITY".freeze
-    WAGESEXPENSE ||= "WAGESEXPENSE".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/accounting/allocation.rb b/lib/xero-ruby/models/accounting/allocation.rb
index 53c348af..1e31746e 100644
--- a/lib/xero-ruby/models/accounting/allocation.rb
+++ b/lib/xero-ruby/models/accounting/allocation.rb
@@ -16,6 +16,9 @@ module XeroRuby::Accounting
   require 'bigdecimal'
 
   class Allocation
+    # Xero generated unique identifier
+    attr_accessor :allocation_id
+
 
     attr_accessor :invoice
     
@@ -34,6 +37,9 @@ class Allocation
     # the date the allocation is applied YYYY-MM-DD.
     attr_accessor :date
     
+    # A flag that returns true when the allocation is succesfully deleted
+    attr_accessor :is_deleted
+
     # A string to indicate if a invoice status
     attr_accessor :status_attribute_string
     
@@ -43,12 +49,14 @@ class Allocation
     # Attribute mapping from ruby-style variable name to JSON key.
     def self.attribute_map
       {
+        :'allocation_id' => :'AllocationID',
         :'invoice' => :'Invoice',
         :'overpayment' => :'Overpayment',
         :'prepayment' => :'Prepayment',
         :'credit_note' => :'CreditNote',
         :'amount' => :'Amount',
         :'date' => :'Date',
+        :'is_deleted' => :'IsDeleted',
         :'status_attribute_string' => :'StatusAttributeString',
         :'validation_errors' => :'ValidationErrors'
       }
@@ -57,12 +65,14 @@ def self.attribute_map
     # Attribute type mapping.
     def self.openapi_types
       {
+        :'allocation_id' => :'String',
         :'invoice' => :'Invoice',
         :'overpayment' => :'Overpayment',
         :'prepayment' => :'Prepayment',
         :'credit_note' => :'CreditNote',
         :'amount' => :'BigDecimal',
         :'date' => :'Date',
+        :'is_deleted' => :'Boolean',
         :'status_attribute_string' => :'String',
         :'validation_errors' => :'Array<ValidationError>'
       }
@@ -83,6 +93,10 @@ def initialize(attributes = {})
         h[k.to_sym] = v
       }
 
+      if attributes.key?(:'allocation_id')
+        self.allocation_id = attributes[:'allocation_id']
+      end
+
       if attributes.key?(:'invoice')
         self.invoice = attributes[:'invoice']
       end
@@ -107,6 +121,10 @@ def initialize(attributes = {})
         self.date = attributes[:'date']
       end
 
+      if attributes.key?(:'is_deleted')
+        self.is_deleted = attributes[:'is_deleted']
+      end
+
       if attributes.key?(:'status_attribute_string')
         self.status_attribute_string = attributes[:'status_attribute_string']
       end
@@ -151,12 +169,14 @@ def valid?
     def ==(o)
       return true if self.equal?(o)
       self.class == o.class &&
+          allocation_id == o.allocation_id &&
           invoice == o.invoice &&
           overpayment == o.overpayment &&
           prepayment == o.prepayment &&
           credit_note == o.credit_note &&
           amount == o.amount &&
           date == o.date &&
+          is_deleted == o.is_deleted &&
           status_attribute_string == o.status_attribute_string &&
           validation_errors == o.validation_errors
     end
@@ -170,7 +190,7 @@ def eql?(o)
     # Calculates hash code according to all attributes.
     # @return [Integer] Hash code
     def hash
-      [invoice, overpayment, prepayment, credit_note, amount, date, status_attribute_string, validation_errors].hash
+      [allocation_id, invoice, overpayment, prepayment, credit_note, amount, date, is_deleted, status_attribute_string, validation_errors].hash
     end
 
     # Builds the object from hash
diff --git a/lib/xero-ruby/models/accounting/contact.rb b/lib/xero-ruby/models/accounting/contact.rb
index cc4ebe93..28245a66 100644
--- a/lib/xero-ruby/models/accounting/contact.rb
+++ b/lib/xero-ruby/models/accounting/contact.rb
@@ -49,9 +49,6 @@ class Contact
     # Email address of contact person (umlauts not supported) (max length  = 255)
     attr_accessor :email_address
     
-    # Skype user name of contact
-    attr_accessor :skype_user_name
-    
     # See contact persons
     attr_accessor :contact_persons
     
@@ -189,7 +186,6 @@ def self.attribute_map
         :'last_name' => :'LastName',
         :'company_number' => :'CompanyNumber',
         :'email_address' => :'EmailAddress',
-        :'skype_user_name' => :'SkypeUserName',
         :'contact_persons' => :'ContactPersons',
         :'bank_account_details' => :'BankAccountDetails',
         :'tax_number' => :'TaxNumber',
@@ -238,7 +234,6 @@ def self.openapi_types
         :'last_name' => :'String',
         :'company_number' => :'String',
         :'email_address' => :'String',
-        :'skype_user_name' => :'String',
         :'contact_persons' => :'Array<ContactPerson>',
         :'bank_account_details' => :'String',
         :'tax_number' => :'String',
@@ -329,10 +324,6 @@ def initialize(attributes = {})
         self.email_address = attributes[:'email_address']
       end
 
-      if attributes.key?(:'skype_user_name')
-        self.skype_user_name = attributes[:'skype_user_name']
-      end
-
       if attributes.key?(:'contact_persons')
         if (value = attributes[:'contact_persons']).is_a?(Array)
           self.contact_persons = value
@@ -666,7 +657,6 @@ def ==(o)
           last_name == o.last_name &&
           company_number == o.company_number &&
           email_address == o.email_address &&
-          skype_user_name == o.skype_user_name &&
           contact_persons == o.contact_persons &&
           bank_account_details == o.bank_account_details &&
           tax_number == o.tax_number &&
@@ -710,7 +700,7 @@ def eql?(o)
     # Calculates hash code according to all attributes.
     # @return [Integer] Hash code
     def hash
-      [contact_id, merged_to_contact_id, contact_number, account_number, contact_status, name, first_name, last_name, company_number, email_address, skype_user_name, contact_persons, bank_account_details, tax_number, accounts_receivable_tax_type, accounts_payable_tax_type, addresses, phones, is_supplier, is_customer, sales_default_line_amount_type, purchases_default_line_amount_type, default_currency, xero_network_key, sales_default_account_code, purchases_default_account_code, sales_tracking_categories, purchases_tracking_categories, tracking_category_name, tracking_category_option, payment_terms, updated_date_utc, contact_groups, website, branding_theme, batch_payments, discount, balances, attachments, has_attachments, validation_errors, has_validation_errors, status_attribute_string].hash
+      [contact_id, merged_to_contact_id, contact_number, account_number, contact_status, name, first_name, last_name, company_number, email_address, contact_persons, bank_account_details, tax_number, accounts_receivable_tax_type, accounts_payable_tax_type, addresses, phones, is_supplier, is_customer, sales_default_line_amount_type, purchases_default_line_amount_type, default_currency, xero_network_key, sales_default_account_code, purchases_default_account_code, sales_tracking_categories, purchases_tracking_categories, tracking_category_name, tracking_category_option, payment_terms, updated_date_utc, contact_groups, website, branding_theme, batch_payments, discount, balances, attachments, has_attachments, validation_errors, has_validation_errors, status_attribute_string].hash
     end
 
     # Builds the object from hash
diff --git a/lib/xero-ruby/models/accounting/currency_code.rb b/lib/xero-ruby/models/accounting/currency_code.rb
index e832ad23..41b50eb5 100644
--- a/lib/xero-ruby/models/accounting/currency_code.rb
+++ b/lib/xero-ruby/models/accounting/currency_code.rb
@@ -182,7 +182,6 @@ class CurrencyCode
     ZMW ||= "ZMW".freeze
     ZMK ||= "ZMK".freeze
     ZWD ||= "ZWD".freeze
-    EMPTY_CURRENCY ||= "".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/accounting/tax_rate.rb b/lib/xero-ruby/models/accounting/tax_rate.rb
index d39a6771..ab61d6a6 100644
--- a/lib/xero-ruby/models/accounting/tax_rate.rb
+++ b/lib/xero-ruby/models/accounting/tax_rate.rb
@@ -131,6 +131,7 @@ class TaxRate
     IMN33 ||= "IMN33".freeze
     IMRE ||= "IMRE".freeze
     BADDEBTRECOVERY ||= "BADDEBTRECOVERY".freeze
+    USSALESTAX ||= "USSALESTAX".freeze
     
     # Boolean to describe if tax rate can be used for asset accounts i.e.  true,false
     attr_accessor :can_apply_to_assets
@@ -289,7 +290,7 @@ def list_invalid_properties
     def valid?
       status_validator = EnumAttributeValidator.new('String', ["ACTIVE", "DELETED", "ARCHIVED", "PENDING"])
       return false unless status_validator.valid?(@status)
-      report_tax_type_validator = EnumAttributeValidator.new('String', ["AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY"])
+      report_tax_type_validator = EnumAttributeValidator.new('String', ["AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY", "USSALESTAX"])
       return false unless report_tax_type_validator.valid?(@report_tax_type)
       true
     end
@@ -307,7 +308,7 @@ def status=(status)
     # Custom attribute writer method checking allowed values (enum).
     # @param [Object] report_tax_type Object to be assigned
     def report_tax_type=(report_tax_type)
-      validator = EnumAttributeValidator.new('String', ["AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY"])
+      validator = EnumAttributeValidator.new('String', ["AVALARA", "BASEXCLUDED", "CAPITALSALESOUTPUT", "CAPITALEXPENSESINPUT", "ECOUTPUT", "ECOUTPUTSERVICES", "ECINPUT", "ECACQUISITIONS", "EXEMPTEXPENSES", "EXEMPTINPUT", "EXEMPTOUTPUT", "GSTONIMPORTS", "INPUT", "INPUTTAXED", "MOSSSALES", "NONE", "NONEOUTPUT", "OUTPUT", "PURCHASESINPUT", "SALESOUTPUT", "EXEMPTCAPITAL", "EXEMPTEXPORT", "CAPITALEXINPUT", "GSTONCAPIMPORTS", "GSTONCAPITALIMPORTS", "REVERSECHARGES", "PAYMENTS", "INVOICE", "CASH", "ACCRUAL", "FLATRATECASH", "FLATRATEACCRUAL", "ACCRUALS", "TXCA", "SRCAS", "DSOUTPUT", "BLINPUT2", "EPINPUT", "IMINPUT2", "MEINPUT", "IGDSINPUT2", "ESN33OUTPUT", "OPINPUT", "OSOUTPUT", "TXN33INPUT", "TXESSINPUT", "TXREINPUT", "TXPETINPUT", "NRINPUT", "ES33OUTPUT", "ZERORATEDINPUT", "ZERORATEDOUTPUT", "DRCHARGESUPPLY", "DRCHARGE", "CAPINPUT", "CAPIMPORTS", "IMINPUT", "INPUT2", "CIUINPUT", "SRINPUT", "OUTPUT2", "SROUTPUT", "CAPOUTPUT", "SROUTPUT2", "CIUOUTPUT", "ZROUTPUT", "ZREXPORT", "ACC28PLUS", "ACCUPTO28", "OTHEROUTPUT", "SHOUTPUT", "ZRINPUT", "BADDEBT", "OTHERINPUT", "BADDEBTRELIEF", "IGDSINPUT3", "SROVR", "TOURISTREFUND", "TXRCN33", "TXRCRE", "TXRCESS", "TXRCTS", "CAPEXINPUT", "UNDEFINED", "CAPEXOUTPUT", "ZEROEXPOUTPUT", "GOODSIMPORT", "NONEINPUT", "NOTREPORTED", "SROVRRS", "SROVRLVG", "SRLVG", "IM", "IMESS", "IMN33", "IMRE", "BADDEBTRECOVERY", "USSALESTAX"])
       unless validator.valid?(report_tax_type)
         fail ArgumentError, "invalid value for \"report_tax_type\", must be one of #{validator.allowable_values}."
       end
diff --git a/lib/xero-ruby/models/accounting/tax_type.rb b/lib/xero-ruby/models/accounting/tax_type.rb
index d41c519b..986343ce 100644
--- a/lib/xero-ruby/models/accounting/tax_type.rb
+++ b/lib/xero-ruby/models/accounting/tax_type.rb
@@ -110,6 +110,30 @@ class TaxType
     IMREY23 ||= "IMREY23".freeze
     BADDEBTRECOVERY ||= "BADDEBTRECOVERY".freeze
     BADDEBTRECOVERYY23 ||= "BADDEBTRECOVERYY23".freeze
+    OUTPUTY24 ||= "OUTPUTY24".freeze
+    DSOUTPUTY24 ||= "DSOUTPUTY24".freeze
+    INPUTY24 ||= "INPUTY24".freeze
+    IGDSINPUT2_Y24 ||= "IGDSINPUT2Y24".freeze
+    TXPETINPUTY24 ||= "TXPETINPUTY24".freeze
+    TXESSINPUTY24 ||= "TXESSINPUTY24".freeze
+    TXN33_INPUTY24 ||= "TXN33INPUTY24".freeze
+    TXREINPUTY24 ||= "TXREINPUTY24".freeze
+    TXCAY24 ||= "TXCAY24".freeze
+    BADDEBTRELIEFY24 ||= "BADDEBTRELIEFY24".freeze
+    IGDSINPUT3_Y24 ||= "IGDSINPUT3Y24".freeze
+    SROVRRSY24 ||= "SROVRRSY24".freeze
+    SROVRLVGY24 ||= "SROVRLVGY24".freeze
+    SRLVGY24 ||= "SRLVGY24".freeze
+    TXRCTSY24 ||= "TXRCTSY24".freeze
+    TXRCESSY24 ||= "TXRCESSY24".freeze
+    TXRCN33_Y24 ||= "TXRCN33Y24".freeze
+    TXRCREY24 ||= "TXRCREY24".freeze
+    IMY24 ||= "IMY24".freeze
+    IMESSY24 ||= "IMESSY24".freeze
+    IMN33_Y24 ||= "IMN33Y24".freeze
+    IMREY24 ||= "IMREY24".freeze
+    BADDEBTRECOVERYY24 ||= "BADDEBTRECOVERYY24".freeze
+    OSOUTPUT2 ||= "OSOUTPUT2".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/accounting/ten_ninety_nine_contact.rb b/lib/xero-ruby/models/accounting/ten_ninety_nine_contact.rb
index 33ce6591..22dc0e76 100644
--- a/lib/xero-ruby/models/accounting/ten_ninety_nine_contact.rb
+++ b/lib/xero-ruby/models/accounting/ten_ninety_nine_contact.rb
@@ -82,6 +82,44 @@ class TenNinetyNineContact
     # Contact contact id
     attr_accessor :contact_id
     
+    # Contact legal name
+    attr_accessor :legal_name
+
+    # Contact business name
+    attr_accessor :business_name
+
+    # Contact federal tax classification
+    attr_accessor :federal_tax_classification
+    SOLE_PROPRIETOR ||= "SOLE_PROPRIETOR".freeze
+    PARTNERSHIP ||= "PARTNERSHIP".freeze
+    TRUST_OR_ESTATE ||= "TRUST_OR_ESTATE".freeze
+    NONPROFIT ||= "NONPROFIT".freeze
+    C_CORP ||= "C_CORP".freeze
+    S_CORP ||= "S_CORP".freeze
+    OTHER ||= "OTHER".freeze
+
+    class EnumAttributeValidator
+      attr_reader :datatype
+      attr_reader :allowable_values
+
+      def initialize(datatype, allowable_values)
+        @allowable_values = allowable_values.map do |value|
+          case datatype.to_s
+          when /Integer/i
+            value.to_i
+          when /Float/i
+            value.to_f
+          else
+            value
+          end
+        end
+      end
+
+      def valid?(value)
+        !value || allowable_values.include?(value)
+      end
+    end
+
     # Attribute mapping from ruby-style variable name to JSON key.
     def self.attribute_map
       {
@@ -106,7 +144,10 @@ def self.attribute_map
         :'email' => :'Email',
         :'street_address' => :'StreetAddress',
         :'tax_id' => :'TaxID',
-        :'contact_id' => :'ContactId'
+        :'contact_id' => :'ContactId',
+        :'legal_name' => :'LegalName',
+        :'business_name' => :'BusinessName',
+        :'federal_tax_classification' => :'FederalTaxClassification'
       }
     end
 
@@ -134,7 +175,10 @@ def self.openapi_types
         :'email' => :'String',
         :'street_address' => :'String',
         :'tax_id' => :'String',
-        :'contact_id' => :'String'
+        :'contact_id' => :'String',
+        :'legal_name' => :'String',
+        :'business_name' => :'String',
+        :'federal_tax_classification' => :'String'
       }
     end
 
@@ -240,6 +284,18 @@ def initialize(attributes = {})
       if attributes.key?(:'contact_id')
         self.contact_id = attributes[:'contact_id']
       end
+
+      if attributes.key?(:'legal_name')
+        self.legal_name = attributes[:'legal_name']
+      end
+
+      if attributes.key?(:'business_name')
+        self.business_name = attributes[:'business_name']
+      end
+
+      if attributes.key?(:'federal_tax_classification')
+        self.federal_tax_classification = attributes[:'federal_tax_classification']
+      end
     end
 
     # Show invalid properties with the reasons. Usually used together with valid?
@@ -252,9 +308,21 @@ def list_invalid_properties
     # Check to see if the all the properties in the model are valid
     # @return true if the model is valid
     def valid?
+      federal_tax_classification_validator = EnumAttributeValidator.new('String', ["SOLE_PROPRIETOR", "PARTNERSHIP", "TRUST_OR_ESTATE", "NONPROFIT", "C_CORP", "S_CORP", "OTHER"])
+      return false unless federal_tax_classification_validator.valid?(@federal_tax_classification)
       true
     end
 
+    # Custom attribute writer method checking allowed values (enum).
+    # @param [Object] federal_tax_classification Object to be assigned
+    def federal_tax_classification=(federal_tax_classification)
+      validator = EnumAttributeValidator.new('String', ["SOLE_PROPRIETOR", "PARTNERSHIP", "TRUST_OR_ESTATE", "NONPROFIT", "C_CORP", "S_CORP", "OTHER"])
+      unless validator.valid?(federal_tax_classification)
+        fail ArgumentError, "invalid value for \"federal_tax_classification\", must be one of #{validator.allowable_values}."
+      end
+      @federal_tax_classification = federal_tax_classification
+    end
+
     # Checks equality by comparing each attribute.
     # @param [Object] Object to be compared
     def ==(o)
@@ -281,7 +349,10 @@ def ==(o)
           email == o.email &&
           street_address == o.street_address &&
           tax_id == o.tax_id &&
-          contact_id == o.contact_id
+          contact_id == o.contact_id &&
+          legal_name == o.legal_name &&
+          business_name == o.business_name &&
+          federal_tax_classification == o.federal_tax_classification
     end
 
     # @see the `==` method
@@ -293,7 +364,7 @@ def eql?(o)
     # Calculates hash code according to all attributes.
     # @return [Integer] Hash code
     def hash
-      [box1, box2, box3, box4, box5, box6, box7, box8, box9, box10, box11, box13, box14, name, federal_tax_id_type, city, zip, state, email, street_address, tax_id, contact_id].hash
+      [box1, box2, box3, box4, box5, box6, box7, box8, box9, box10, box11, box13, box14, name, federal_tax_id_type, city, zip, state, email, street_address, tax_id, contact_id, legal_name, business_name, federal_tax_classification].hash
     end
 
     # Builds the object from hash
diff --git a/lib/xero-ruby/models/finance/problem_type.rb b/lib/xero-ruby/models/finance/problem_type.rb
index 561934b6..677c509f 100644
--- a/lib/xero-ruby/models/finance/problem_type.rb
+++ b/lib/xero-ruby/models/finance/problem_type.rb
@@ -24,6 +24,7 @@ class ProblemType
     REQUEST_TIMEOUT ||= "request-timeout".freeze
     SERVICE_UNAVAILABLE ||= "service-unavailable".freeze
     UNAUTHORIZED ||= "unauthorized".freeze
+    RATE_LIMIT_ERROR ||= "rate-limit-error".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/payroll_au/country_of_residence.rb b/lib/xero-ruby/models/payroll_au/country_of_residence.rb
index 328fbc09..bb768069 100644
--- a/lib/xero-ruby/models/payroll_au/country_of_residence.rb
+++ b/lib/xero-ruby/models/payroll_au/country_of_residence.rb
@@ -264,7 +264,6 @@ class CountryOfResidence
     CW ||= "CW".freeze
     SX ||= "SX".freeze
     SS ||= "SS".freeze
-    EMPTY ||= "".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/payroll_au/leave_line_calculation_type.rb b/lib/xero-ruby/models/payroll_au/leave_line_calculation_type.rb
index dbb35038..e8136acd 100644
--- a/lib/xero-ruby/models/payroll_au/leave_line_calculation_type.rb
+++ b/lib/xero-ruby/models/payroll_au/leave_line_calculation_type.rb
@@ -18,7 +18,6 @@ class LeaveLineCalculationType
     FIXEDAMOUNTEACHPERIOD ||= "FIXEDAMOUNTEACHPERIOD".freeze
     ENTERRATEINPAYTEMPLATE ||= "ENTERRATEINPAYTEMPLATE".freeze
     BASEDONORDINARYEARNINGS ||= "BASEDONORDINARYEARNINGS".freeze
-    EMPTY ||= "".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/payroll_au/leave_period_status.rb b/lib/xero-ruby/models/payroll_au/leave_period_status.rb
index 40e88553..5f4f0db3 100644
--- a/lib/xero-ruby/models/payroll_au/leave_period_status.rb
+++ b/lib/xero-ruby/models/payroll_au/leave_period_status.rb
@@ -16,6 +16,8 @@ module XeroRuby::PayrollAu
   class LeavePeriodStatus
     SCHEDULED ||= "SCHEDULED".freeze
     PROCESSED ||= "PROCESSED".freeze
+    REQUESTED ||= "REQUESTED".freeze
+    REJECTED ||= "REJECTED".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/models/payroll_nz/employee.rb b/lib/xero-ruby/models/payroll_nz/employee.rb
index 3adc2442..270d694f 100644
--- a/lib/xero-ruby/models/payroll_nz/employee.rb
+++ b/lib/xero-ruby/models/payroll_nz/employee.rb
@@ -60,6 +60,9 @@ class Employee
     # UTC timestamp when the employee was created in Xero
     attr_accessor :created_date_utc
     
+    # Employee's job title
+    attr_accessor :job_title
+
     class EnumAttributeValidator
       attr_reader :datatype
       attr_reader :allowable_values
@@ -98,7 +101,8 @@ def self.attribute_map
         :'end_date' => :'endDate',
         :'payroll_calendar_id' => :'payrollCalendarID',
         :'updated_date_utc' => :'updatedDateUTC',
-        :'created_date_utc' => :'createdDateUTC'
+        :'created_date_utc' => :'createdDateUTC',
+        :'job_title' => :'jobTitle'
       }
     end
 
@@ -118,7 +122,8 @@ def self.openapi_types
         :'end_date' => :'Date',
         :'payroll_calendar_id' => :'String',
         :'updated_date_utc' => :'DateTime',
-        :'created_date_utc' => :'DateTime'
+        :'created_date_utc' => :'DateTime',
+        :'job_title' => :'String'
       }
     end
 
@@ -192,6 +197,10 @@ def initialize(attributes = {})
       if attributes.key?(:'created_date_utc')
         self.created_date_utc = attributes[:'created_date_utc']
       end
+
+      if attributes.key?(:'job_title')
+        self.job_title = attributes[:'job_title']
+      end
     end
 
     # Show invalid properties with the reasons. Usually used together with valid?
@@ -237,7 +246,8 @@ def ==(o)
           end_date == o.end_date &&
           payroll_calendar_id == o.payroll_calendar_id &&
           updated_date_utc == o.updated_date_utc &&
-          created_date_utc == o.created_date_utc
+          created_date_utc == o.created_date_utc &&
+          job_title == o.job_title
     end
 
     # @see the `==` method
@@ -249,7 +259,7 @@ def eql?(o)
     # Calculates hash code according to all attributes.
     # @return [Integer] Hash code
     def hash
-      [employee_id, title, first_name, last_name, date_of_birth, address, email, gender, phone_number, start_date, end_date, payroll_calendar_id, updated_date_utc, created_date_utc].hash
+      [employee_id, title, first_name, last_name, date_of_birth, address, email, gender, phone_number, start_date, end_date, payroll_calendar_id, updated_date_utc, created_date_utc, job_title].hash
     end
 
     # Builds the object from hash
diff --git a/lib/xero-ruby/models/projects/currency_code.rb b/lib/xero-ruby/models/projects/currency_code.rb
index 32e96f82..500ba1ab 100644
--- a/lib/xero-ruby/models/projects/currency_code.rb
+++ b/lib/xero-ruby/models/projects/currency_code.rb
@@ -177,7 +177,6 @@ class CurrencyCode
     ZMW ||= "ZMW".freeze
     ZMK ||= "ZMK".freeze
     ZWD ||= "ZWD".freeze
-    EMPTY ||= "".freeze
 
     # Builds the enum from string
     # @param [String] The enum value in the form of the string
diff --git a/lib/xero-ruby/version.rb b/lib/xero-ruby/version.rb
index 89347445..c59a4f6f 100644
--- a/lib/xero-ruby/version.rb
+++ b/lib/xero-ruby/version.rb
@@ -7,9 +7,9 @@
 Generated by: https://openapi-generator.tech
 OpenAPI Generator version: 4.3.1
 
-The version of the XeroOpenAPI document: 2.38.0
+The version of the XeroOpenAPI document: 3.0.0
 =end
 
 module XeroRuby
-  VERSION = '4.3.1'
+  VERSION = '5.0.0'
 end