diff --git a/docs/v2/accounting/index.html b/docs/v2/accounting/index.html
index b06ac355..85ac4bb6 100644
--- a/docs/v2/accounting/index.html
+++ b/docs/v2/accounting/index.html
@@ -6092,7 +6092,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="Accounting"><strong>VSN: </strong>3.0.0</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>
@@ -7606,9 +7606,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
 $contact->setContactID('00000000-0000-0000-0000-000000000000');
@@ -7636,7 +7636,7 @@ <h3>Usage and SDK Samples</h3>
 $bankTransactions->setBankTransactions($arr_bank_transactions);
 
 try {
-  $result = $apiInstance->createBankTransactions($xeroTenantId, $bankTransactions, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->createBankTransactions($xeroTenantId, $bankTransactions, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createBankTransactions: ', $e->getMessage(), PHP_EOL;
 }
@@ -9693,8 +9693,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 $phone = new XeroAPI\XeroPHP\Models\Accounting\Phone;
 $phone->setPhoneNumber('555-1212');
@@ -9713,7 +9713,7 @@ <h3>Usage and SDK Samples</h3>
 $contacts->setContacts($arr_contacts);
 
 try {
-  $result = $apiInstance->createContacts($xeroTenantId, $contacts, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createContacts($xeroTenantId, $contacts, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createContacts: ', $e->getMessage(), PHP_EOL;
 }
@@ -9883,8 +9883,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $creditNoteID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $invoice = new XeroAPI\XeroPHP\Models\Accounting\Invoice;
@@ -9901,7 +9901,7 @@ <h3>Usage and SDK Samples</h3>
 $allocations->setAllocations($arr_allocations);
 
 try {
-  $result = $apiInstance->createCreditNoteAllocation($xeroTenantId, $creditNoteID, $allocations, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createCreditNoteAllocation($xeroTenantId, $creditNoteID, $allocations, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createCreditNoteAllocation: ', $e->getMessage(), PHP_EOL;
 }
@@ -10105,15 +10105,15 @@ <h3>Usage and SDK Samples</h3>
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $creditNoteID = "00000000-0000-0000-0000-000000000000";
 $fileName = "xero-dev.jpg";
-$idempotencyKey = "KEY_VALUE";
 $includeOnline = true;
+$idempotencyKey = "KEY_VALUE";
 
 $handle = fopen($fileName, "r");
 $body = fread($handle, filesize($fileName));
 fclose($handle);
 
 try {
-  $result = $apiInstance->createCreditNoteAttachmentByFileName($xeroTenantId, $creditNoteID, $fileName, $body, $idempotencyKey, $includeOnline);
+  $result = $apiInstance->createCreditNoteAttachmentByFileName($xeroTenantId, $creditNoteID, $fileName, $body, $includeOnline, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createCreditNoteAttachmentByFileName: ', $e->getMessage(), PHP_EOL;
 }
@@ -10525,9 +10525,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -10553,7 +10553,7 @@ <h3>Usage and SDK Samples</h3>
 $creditNotes->setCreditNotes($arr_credit_notes);
 
 try {
-  $result = $apiInstance->createCreditNotes($xeroTenantId, $creditNotes, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->createCreditNotes($xeroTenantId, $creditNotes, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createCreditNotes: ', $e->getMessage(), PHP_EOL;
 }
@@ -10891,8 +10891,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 $employee = new XeroAPI\XeroPHP\Models\Accounting\Employee;
 $employee->setFirstName('Nick');
@@ -10904,7 +10904,7 @@ <h3>Usage and SDK Samples</h3>
 $employees->setEmployees($arr_employees);
 
 try {
-  $result = $apiInstance->createEmployees($xeroTenantId, $employees, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createEmployees($xeroTenantId, $employees, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createEmployees: ', $e->getMessage(), PHP_EOL;
 }
@@ -11427,15 +11427,15 @@ <h3>Usage and SDK Samples</h3>
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $invoiceID = "00000000-0000-0000-0000-000000000000";
 $fileName = "xero-dev.jpg";
-$idempotencyKey = "KEY_VALUE";
 $includeOnline = true;
+$idempotencyKey = "KEY_VALUE";
 
 $handle = fopen($fileName, "r");
 $body = fread($handle, filesize($fileName));
 fclose($handle);
 
 try {
-  $result = $apiInstance->createInvoiceAttachmentByFileName($xeroTenantId, $invoiceID, $fileName, $body, $idempotencyKey, $includeOnline);
+  $result = $apiInstance->createInvoiceAttachmentByFileName($xeroTenantId, $invoiceID, $fileName, $body, $includeOnline, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createInvoiceAttachmentByFileName: ', $e->getMessage(), PHP_EOL;
 }
@@ -11847,9 +11847,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-10-10');
 $dueDateValue = new DateTime('2020-10-28');
 
@@ -11886,7 +11886,7 @@ <h3>Usage and SDK Samples</h3>
 $invoices->setInvoices($arr_invoices);
 
 try {
-  $result = $apiInstance->createInvoices($xeroTenantId, $invoices, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->createInvoices($xeroTenantId, $invoices, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createInvoices: ', $e->getMessage(), PHP_EOL;
 }
@@ -12262,9 +12262,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $purchaseDetails = new XeroAPI\XeroPHP\Models\Accounting\Purchase;
 $purchaseDetails->setCoGSAccountCode('500');
@@ -12282,7 +12282,7 @@ <h3>Usage and SDK Samples</h3>
 $items->setItems($arr_items);
 
 try {
-  $result = $apiInstance->createItems($xeroTenantId, $items, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->createItems($xeroTenantId, $items, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createItems: ', $e->getMessage(), PHP_EOL;
 }
@@ -13014,8 +13014,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2019-10-10');
 $manualJournalLines = [];
 
@@ -13042,7 +13042,7 @@ <h3>Usage and SDK Samples</h3>
 $manualJournals->setManualJournals($arr_manual_journals);
 
 try {
-  $result = $apiInstance->createManualJournals($xeroTenantId, $manualJournals, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createManualJournals($xeroTenantId, $manualJournals, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createManualJournals: ', $e->getMessage(), PHP_EOL;
 }
@@ -13212,8 +13212,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $overpaymentID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $invoice = new XeroAPI\XeroPHP\Models\Accounting\Invoice;
@@ -13230,7 +13230,7 @@ <h3>Usage and SDK Samples</h3>
 $allocations->setAllocations($arr_allocations);
 
 try {
-  $result = $apiInstance->createOverpaymentAllocations($xeroTenantId, $overpaymentID, $allocations, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createOverpaymentAllocations($xeroTenantId, $overpaymentID, $allocations, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createOverpaymentAllocations: ', $e->getMessage(), PHP_EOL;
 }
@@ -14124,8 +14124,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-10-10');
 
 $invoice = new XeroAPI\XeroPHP\Models\Accounting\Invoice;
@@ -14146,7 +14146,7 @@ <h3>Usage and SDK Samples</h3>
 $payments->setPayments($arr_payments);
 
 try {
-  $result = $apiInstance->createPayments($xeroTenantId, $payments, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createPayments($xeroTenantId, $payments, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createPayments: ', $e->getMessage(), PHP_EOL;
 }
@@ -14316,8 +14316,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $prepaymentID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $invoice = new XeroAPI\XeroPHP\Models\Accounting\Invoice;
@@ -14334,7 +14334,7 @@ <h3>Usage and SDK Samples</h3>
 $allocations->setAllocations($arr_allocations);
 
 try {
-  $result = $apiInstance->createPrepaymentAllocations($xeroTenantId, $prepaymentID, $allocations, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createPrepaymentAllocations($xeroTenantId, $prepaymentID, $allocations, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createPrepaymentAllocations: ', $e->getMessage(), PHP_EOL;
 }
@@ -15117,8 +15117,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -15143,7 +15143,7 @@ <h3>Usage and SDK Samples</h3>
 $purchaseOrders->setPurchaseOrders($arr_purchase_orders);
 
 try {
-  $result = $apiInstance->createPurchaseOrders($xeroTenantId, $purchaseOrders, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createPurchaseOrders($xeroTenantId, $purchaseOrders, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createPurchaseOrders: ', $e->getMessage(), PHP_EOL;
 }
@@ -15706,8 +15706,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -15732,7 +15732,7 @@ <h3>Usage and SDK Samples</h3>
 $quotes->setQuotes($arr_quotes);
 
 try {
-  $result = $apiInstance->createQuotes($xeroTenantId, $quotes, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createQuotes($xeroTenantId, $quotes, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createQuotes: ', $e->getMessage(), PHP_EOL;
 }
@@ -15901,8 +15901,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
 $contact->setContactID('00000000-0000-0000-0000-000000000000');
@@ -15931,7 +15931,7 @@ <h3>Usage and SDK Samples</h3>
 $receipts->setReceipts($arr_receipts);
 
 try {
-  $result = $apiInstance->createReceipt($xeroTenantId, $receipts, $idempotencyKey, $unitdp);
+  $result = $apiInstance->createReceipt($xeroTenantId, $receipts, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createReceipt: ', $e->getMessage(), PHP_EOL;
 }
@@ -16888,11 +16888,11 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 try {
-  $result = $apiInstance->createRepeatingInvoices($xeroTenantId, $repeatingInvoices, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->createRepeatingInvoices($xeroTenantId, $repeatingInvoices, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->createRepeatingInvoices: ', $e->getMessage(), PHP_EOL;
 }
@@ -39448,8 +39448,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $bankTransactionID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
 $contact->setContactID('00000000-0000-0000-0000-000000000000');
@@ -39478,7 +39478,7 @@ <h3>Usage and SDK Samples</h3>
 $bankTransactions->setBankTransactions($arr_bank_transactions);
 
 try {
-  $result = $apiInstance->updateBankTransaction($xeroTenantId, $bankTransactionID, $bankTransactions, $idempotencyKey, $unitdp);
+  $result = $apiInstance->updateBankTransaction($xeroTenantId, $bankTransactionID, $bankTransactions, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateBankTransaction: ', $e->getMessage(), PHP_EOL;
 }
@@ -40676,8 +40676,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $creditNoteID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -40705,7 +40705,7 @@ <h3>Usage and SDK Samples</h3>
 $creditNotes->setCreditNotes($arr_credit_notes);
 
 try {
-  $result = $apiInstance->updateCreditNote($xeroTenantId, $creditNoteID, $creditNotes, $idempotencyKey, $unitdp);
+  $result = $apiInstance->updateCreditNote($xeroTenantId, $creditNoteID, $creditNotes, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateCreditNote: ', $e->getMessage(), PHP_EOL;
 }
@@ -41313,8 +41313,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $invoiceID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $invoice = new XeroAPI\XeroPHP\Models\Accounting\Invoice;
 $invoice->setReference('I am Iron man');
@@ -41325,7 +41325,7 @@ <h3>Usage and SDK Samples</h3>
 $invoices->setInvoices($arr_invoices);
 
 try {
-  $result = $apiInstance->updateInvoice($xeroTenantId, $invoiceID, $invoices, $idempotencyKey, $unitdp);
+  $result = $apiInstance->updateInvoice($xeroTenantId, $invoiceID, $invoices, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateInvoice: ', $e->getMessage(), PHP_EOL;
 }
@@ -41734,8 +41734,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $itemID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $item = new XeroAPI\XeroPHP\Models\Accounting\Item;
 $item->setCode('ItemCode123');
@@ -41747,7 +41747,7 @@ <h3>Usage and SDK Samples</h3>
 $items->setItems($arr_items);
 
 try {
-  $result = $apiInstance->updateItem($xeroTenantId, $itemID, $items, $idempotencyKey, $unitdp);
+  $result = $apiInstance->updateItem($xeroTenantId, $itemID, $items, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateItem: ', $e->getMessage(), PHP_EOL;
 }
@@ -42544,9 +42544,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
 $contact->setContactID('00000000-0000-0000-0000-000000000000');
@@ -42574,7 +42574,7 @@ <h3>Usage and SDK Samples</h3>
 $bankTransactions->setBankTransactions($arr_bank_transactions);
 
 try {
-  $result = $apiInstance->updateOrCreateBankTransactions($xeroTenantId, $bankTransactions, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->updateOrCreateBankTransactions($xeroTenantId, $bankTransactions, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateBankTransactions: ', $e->getMessage(), PHP_EOL;
 }
@@ -42762,8 +42762,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 $phone = new XeroAPI\XeroPHP\Models\Accounting\Phone;
 $phone->setPhoneNumber('555-1212');
@@ -42782,7 +42782,7 @@ <h3>Usage and SDK Samples</h3>
 $contacts->setContacts($arr_contacts);
 
 try {
-  $result = $apiInstance->updateOrCreateContacts($xeroTenantId, $contacts, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreateContacts($xeroTenantId, $contacts, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateContacts: ', $e->getMessage(), PHP_EOL;
 }
@@ -42950,9 +42950,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $currDate = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -42978,7 +42978,7 @@ <h3>Usage and SDK Samples</h3>
 $creditNotes->setCreditNotes($arr_credit_notes);
 
 try {
-  $result = $apiInstance->updateOrCreateCreditNotes($xeroTenantId, $creditNotes, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->updateOrCreateCreditNotes($xeroTenantId, $creditNotes, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateCreditNotes: ', $e->getMessage(), PHP_EOL;
 }
@@ -43167,8 +43167,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 $employee = new XeroAPI\XeroPHP\Models\Accounting\Employee;
 $employee->setFirstName('Nick');
@@ -43180,7 +43180,7 @@ <h3>Usage and SDK Samples</h3>
 $employees->setEmployees($arr_employees);
 
 try {
-  $result = $apiInstance->updateOrCreateEmployees($xeroTenantId, $employees, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreateEmployees($xeroTenantId, $employees, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateEmployees: ', $e->getMessage(), PHP_EOL;
 }
@@ -43349,9 +43349,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-10-10');
 $dueDateValue = new DateTime('2020-10-28');
 
@@ -43381,7 +43381,7 @@ <h3>Usage and SDK Samples</h3>
 $invoices->setInvoices($arr_invoices);
 
 try {
-  $result = $apiInstance->updateOrCreateInvoices($xeroTenantId, $invoices, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->updateOrCreateInvoices($xeroTenantId, $invoices, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateInvoices: ', $e->getMessage(), PHP_EOL;
 }
@@ -43569,9 +43569,9 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 
 $item = new XeroAPI\XeroPHP\Models\Accounting\Item;
 $item->setCode('abcXYZ123');
@@ -43584,7 +43584,7 @@ <h3>Usage and SDK Samples</h3>
 $items->setItems($arr_items);
 
 try {
-  $result = $apiInstance->updateOrCreateItems($xeroTenantId, $items, $idempotencyKey, $summarizeErrors, $unitdp);
+  $result = $apiInstance->updateOrCreateItems($xeroTenantId, $items, $summarizeErrors, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateItems: ', $e->getMessage(), PHP_EOL;
 }
@@ -43772,8 +43772,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-10-10');
 $manualJournalLines = [];
 
@@ -43800,7 +43800,7 @@ <h3>Usage and SDK Samples</h3>
 $manualJournals->setManualJournals($arr_manual_journals);
 
 try {
-  $result = $apiInstance->updateOrCreateManualJournals($xeroTenantId, $manualJournals, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreateManualJournals($xeroTenantId, $manualJournals, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateManualJournals: ', $e->getMessage(), PHP_EOL;
 }
@@ -43969,8 +43969,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -43995,7 +43995,7 @@ <h3>Usage and SDK Samples</h3>
 $purchaseOrders->setPurchaseOrders($arr_purchase_orders);
 
 try {
-  $result = $apiInstance->updateOrCreatePurchaseOrders($xeroTenantId, $purchaseOrders, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreatePurchaseOrders($xeroTenantId, $purchaseOrders, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreatePurchaseOrders: ', $e->getMessage(), PHP_EOL;
 }
@@ -44163,8 +44163,8 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-12-10');
 
 $contact = new XeroAPI\XeroPHP\Models\Accounting\Contact;
@@ -44189,7 +44189,7 @@ <h3>Usage and SDK Samples</h3>
 $quotes->setQuotes($arr_quotes);
 
 try {
-  $result = $apiInstance->updateOrCreateQuotes($xeroTenantId, $quotes, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreateQuotes($xeroTenantId, $quotes, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateQuotes: ', $e->getMessage(), PHP_EOL;
 }
@@ -44357,11 +44357,11 @@ <h3>Usage and SDK Samples</h3>
     $config
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
-$idempotencyKey = "KEY_VALUE";
 $summarizeErrors = true;
+$idempotencyKey = "KEY_VALUE";
 
 try {
-  $result = $apiInstance->updateOrCreateRepeatingInvoices($xeroTenantId, $repeatingInvoices, $idempotencyKey, $summarizeErrors);
+  $result = $apiInstance->updateOrCreateRepeatingInvoices($xeroTenantId, $repeatingInvoices, $summarizeErrors, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateOrCreateRepeatingInvoices: ', $e->getMessage(), PHP_EOL;
 }
@@ -45323,8 +45323,8 @@ <h3>Usage and SDK Samples</h3>
 );
 $xeroTenantId = "YOUR_XERO_TENANT_ID";
 $receiptID = "00000000-0000-0000-0000-000000000000";
-$idempotencyKey = "KEY_VALUE";
 $unitdp = 4;
+$idempotencyKey = "KEY_VALUE";
 $dateValue = new DateTime('2020-12-10');
 
 $user = new XeroAPI\XeroPHP\Models\Accounting\User;
@@ -45341,7 +45341,7 @@ <h3>Usage and SDK Samples</h3>
 $receipts->setReceipts($arr_receipts);
 
 try {
-  $result = $apiInstance->updateReceipt($xeroTenantId, $receiptID, $receipts, $idempotencyKey, $unitdp);
+  $result = $apiInstance->updateReceipt($xeroTenantId, $receiptID, $receipts, $unitdp, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AccountingApi->updateReceipt: ', $e->getMessage(), PHP_EOL;
 }
diff --git a/docs/v2/appstore/index.html b/docs/v2/appstore/index.html
index 8d86bb1c..48bee8e0 100644
--- a/docs/v2/appstore/index.html
+++ b/docs/v2/appstore/index.html
@@ -1240,7 +1240,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="AppStore"><strong>VSN: </strong>3.0.0</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>
diff --git a/docs/v2/assets/index.html b/docs/v2/assets/index.html
index afe03f7b..13d12c8a 100644
--- a/docs/v2/assets/index.html
+++ b/docs/v2/assets/index.html
@@ -1391,7 +1391,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="Asset"><strong>VSN: </strong>3.0.0</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>
@@ -1629,7 +1629,7 @@ <h3>Usage and SDK Samples</h3>
 $assetType->setBookDepreciationSetting($bookDepreciationSetting);
 
 try {
-  $result = $apiInstance->createAssetType($xeroTenantId, $idempotencyKey, $assetType);
+  $result = $apiInstance->createAssetType($xeroTenantId, $assetType, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling AssetApi->createAssetType: ', $e->getMessage(), PHP_EOL;
 }
@@ -1704,7 +1704,7 @@ <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">
@@ -1715,6 +1715,9 @@ <h2>Parameters</h2>
           Asset type to add
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1726,7 +1729,8 @@ <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/v2/files/index.html b/docs/v2/files/index.html
index 25e2079a..ed1fd3f6 100644
--- a/docs/v2/files/index.html
+++ b/docs/v2/files/index.html
@@ -1154,7 +1154,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="Files"><strong>VSN: </strong>3.0.0</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>
@@ -1266,7 +1266,7 @@ <h3>Usage and SDK Samples</h3>
 $idempotencyKey = "KEY_VALUE";
 
 try {
-  $result = $apiInstance->createFileAssociation($xeroTenantId, $fileId, $idempotencyKey, $association);
+  $result = $apiInstance->createFileAssociation($xeroTenantId, $fileId, $association, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling FilesApi->createFileAssociation: ', $e->getMessage(), PHP_EOL;
 }
@@ -1374,7 +1374,7 @@ <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">
@@ -1385,6 +1385,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1395,7 +1398,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"ObjectId\": \"1270bf7c-5d18-473a-9231-1e36c4bd33ed\", \"ObjectGroup\": \"Contact\", \"ObjectType\": \"Business\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -1439,7 +1443,7 @@ <h3>Usage and SDK Samples</h3>
 $idempotencyKey = "KEY_VALUE";
 
 try {
-  $result = $apiInstance->createFolder($xeroTenantId, $idempotencyKey, $folder);
+  $result = $apiInstance->createFolder($xeroTenantId, $folder, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling FilesApi->createFolder: ', $e->getMessage(), PHP_EOL;
 }
@@ -1514,7 +1518,7 @@ <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">
@@ -1525,6 +1529,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -1535,7 +1542,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"Name\": \"My Docs\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -3191,7 +3199,7 @@ <h3>Usage and SDK Samples</h3>
 $idempotencyKey = "KEY_VALUE";
 
 try {
-  $result = $apiInstance->updateFile($xeroTenantId, $fileId, $idempotencyKey, $fileObject);
+  $result = $apiInstance->updateFile($xeroTenantId, $fileId, $fileObject, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling FilesApi->updateFile: ', $e->getMessage(), PHP_EOL;
 }
@@ -3299,7 +3307,7 @@ <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">
@@ -3310,6 +3318,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -3320,7 +3331,8 @@ <h2>Parameters</h2>
       },
       "example" : "{ \"FolderId\": \"bf924975-7097-46f2-a143-1ecfbab3c8c3\" }"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
diff --git a/docs/v2/finance/index.html b/docs/v2/finance/index.html
index 914d682a..5f7ee2f5 100644
--- a/docs/v2/finance/index.html
+++ b/docs/v2/finance/index.html
@@ -2733,7 +2733,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="Finance"><strong>VSN: </strong>3.0.0</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/v2/payroll_au/index.html b/docs/v2/payroll_au/index.html
index 0207ce7d..f54b1146 100644
--- a/docs/v2/payroll_au/index.html
+++ b/docs/v2/payroll_au/index.html
@@ -3411,7 +3411,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="PayrollAu"><strong>VSN: </strong>3.0.0</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>
@@ -7575,7 +7575,7 @@ <h3>Usage and SDK Samples</h3>
 $employee->setHomeAddress($homeAddress);
 
 try {
-  $result = $apiInstance->updateEmployee($xeroTenantId, $employeeID, $idempotencyKey, $employee);
+  $result = $apiInstance->updateEmployee($xeroTenantId, $employeeID, $employee, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling PayrollAuApi->updateEmployee: ', $e->getMessage(), PHP_EOL;
 }
@@ -7683,7 +7683,7 @@ <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">
@@ -7694,6 +7694,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -7707,7 +7710,8 @@ <h2>Parameters</h2>
       },
       "example" : "[ { \"MiddleNames\": \"Frank\" } ]"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -7945,7 +7949,7 @@ <h3>Usage and SDK Samples</h3>
 $payRun->setPayrollCalendarID('00000000-0000-0000-0000-000000000000');
 
 try {
-  $result = $apiInstance->updatePayRun($xeroTenantId, $payRunID, $idempotencyKey, $payRun);
+  $result = $apiInstance->updatePayRun($xeroTenantId, $payRunID, $payRun, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling PayrollAuApi->updatePayRun: ', $e->getMessage(), PHP_EOL;
 }
@@ -8053,7 +8057,7 @@ <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">
@@ -8064,6 +8068,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -8077,7 +8084,8 @@ <h2>Parameters</h2>
         }
       }
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -8134,7 +8142,7 @@ <h3>Usage and SDK Samples</h3>
 array_push($payslipLines, $payslipLine);
 
 try {
-  $result = $apiInstance->updatePayslip($xeroTenantId, $payslipID, $idempotencyKey, $payslipLines);
+  $result = $apiInstance->updatePayslip($xeroTenantId, $payslipID, $payslipLines, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling PayrollAuApi->updatePayslip: ', $e->getMessage(), PHP_EOL;
 }
@@ -8242,7 +8250,7 @@ <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">
@@ -8253,6 +8261,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -8266,7 +8277,8 @@ <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>
@@ -8315,7 +8327,7 @@ <h3>Usage and SDK Samples</h3>
 $superfund->setUSI('40022701955002');
 
 try {
-  $result = $apiInstance->updateSuperfund($xeroTenantId, $superFundID, $idempotencyKey, $superFund);
+  $result = $apiInstance->updateSuperfund($xeroTenantId, $superFundID, $superFund, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling PayrollAuApi->updateSuperfund: ', $e->getMessage(), PHP_EOL;
 }
@@ -8423,7 +8435,7 @@ <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">
@@ -8434,6 +8446,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -8447,7 +8462,8 @@ <h2>Parameters</h2>
       },
       "example" : " [ { \"Type\":\"REGULATED\", \"Name\":\"Nice23534\" } ]"
     }
-  }
+  },
+  "required" : true
 }
     </script>
                   </table>
@@ -8500,7 +8516,7 @@ <h3>Usage and SDK Samples</h3>
 $timesheet->setStatus(XeroAPI\XeroPHP\Models\PayrollAu\TimesheetStatus::DRAFT);
 
 try {
-  $result = $apiInstance->updateTimesheet($xeroTenantId, $timesheetID, $idempotencyKey, $timesheet);
+  $result = $apiInstance->updateTimesheet($xeroTenantId, $timesheetID, $timesheet, $idempotencyKey);
 } catch (Exception $e) {
   echo 'Exception when calling PayrollAuApi->updateTimesheet: ', $e->getMessage(), PHP_EOL;
 }
@@ -8608,7 +8624,7 @@ <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">
@@ -8619,6 +8635,9 @@ <h2>Parameters</h2>
           
         </div>
       </div>
+      <div class="inner required">
+        Required
+      </div>
     </div>
     <script type="application/ld+json">
       {
@@ -8632,7 +8651,8 @@ <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/v2/payroll_nz/index.html b/docs/v2/payroll_nz/index.html
index 75b7b3a9..48ab3224 100644
--- a/docs/v2/payroll_nz/index.html
+++ b/docs/v2/payroll_nz/index.html
@@ -3842,7 +3842,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="PayrollNz"><strong>VSN: </strong>3.0.0</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>
diff --git a/docs/v2/payroll_uk/index.html b/docs/v2/payroll_uk/index.html
index 4da74092..be5cc08f 100644
--- a/docs/v2/payroll_uk/index.html
+++ b/docs/v2/payroll_uk/index.html
@@ -3509,7 +3509,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="PayrollUk"><strong>VSN: </strong>3.0.0</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>
diff --git a/docs/v2/projects/index.html b/docs/v2/projects/index.html
index efe8af3a..9099825d 100644
--- a/docs/v2/projects/index.html
+++ b/docs/v2/projects/index.html
@@ -1461,7 +1461,7 @@
           <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>2.23.3</li>
+              <li class="nav-header" data-group="Project"><strong>VSN: </strong>3.0.0</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>
diff --git a/lib/Api/AccountingApi.php b/lib/Api/AccountingApi.php
index c866959e..eee2714d 100644
--- a/lib/Api/AccountingApi.php
+++ b/lib/Api/AccountingApi.php
@@ -14,7 +14,7 @@
  *
  * No description provided (generated by Openapi Generator https://github.com/openapitools/openapi-generator)
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
@@ -1277,16 +1277,16 @@ protected function createBankTransactionHistoryRecordRequest($xero_tenant_id, $b
      * Creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions BankTransactions with an array of BankTransaction objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createBankTransactions($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createBankTransactions($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->createBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->createBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -1294,16 +1294,16 @@ public function createBankTransactions($xero_tenant_id, $bank_transactions, $ide
      * Creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions BankTransactions with an array of BankTransaction objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -1393,15 +1393,15 @@ public function createBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transa
      * Creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions BankTransactions with an array of BankTransaction objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createBankTransactionsAsync($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createBankTransactionsAsync($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->createBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->createBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -1413,15 +1413,15 @@ function ($response) {
      * Creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions BankTransactions with an array of BankTransaction objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\BankTransactions';
-        $request = $this->createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -1459,12 +1459,12 @@ function ($exception) {
      * Create request for operation 'createBankTransactions'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions BankTransactions with an array of BankTransaction objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function createBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -4474,15 +4474,15 @@ protected function createContactHistoryRequest($xero_tenant_id, $contact_id, $hi
      * Creates multiple contacts (bulk) in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts Contacts with an array of Contact objects to create in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Contacts|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createContacts($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function createContacts($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createContactsWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        list($response) = $this->createContactsWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -4490,15 +4490,15 @@ public function createContacts($xero_tenant_id, $contacts, $idempotency_key = nu
      * Creates multiple contacts (bulk) in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts Contacts with an array of Contact objects to create in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Contacts|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createContactsWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function createContactsWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createContactsRequest($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        $request = $this->createContactsRequest($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -4588,14 +4588,14 @@ public function createContactsWithHttpInfo($xero_tenant_id, $contacts, $idempote
      * Creates multiple contacts (bulk) in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts Contacts with an array of Contact objects to create in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createContactsAsync($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function createContactsAsync($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors)
+        return $this->createContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -4607,14 +4607,14 @@ function ($response) {
      * Creates multiple contacts (bulk) in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts Contacts with an array of Contact objects to create in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function createContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Contacts';
-        $request = $this->createContactsRequest($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        $request = $this->createContactsRequest($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -4652,11 +4652,11 @@ function ($exception) {
      * Create request for operation 'createContacts'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts Contacts with an array of Contact objects to create in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createContactsRequest($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    protected function createContactsRequest($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -4757,15 +4757,15 @@ protected function createContactsRequest($xero_tenant_id, $contacts, $idempotenc
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with array of Allocation object in body of request. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createCreditNoteAllocation($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createCreditNoteAllocation($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createCreditNoteAllocationWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key, $summarize_errors);
+        list($response) = $this->createCreditNoteAllocationWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -4774,15 +4774,15 @@ public function createCreditNoteAllocation($xero_tenant_id, $credit_note_id, $al
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with array of Allocation object in body of request. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createCreditNoteAllocationWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createCreditNoteAllocationWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -4873,14 +4873,14 @@ public function createCreditNoteAllocationWithHttpInfo($xero_tenant_id, $credit_
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with array of Allocation object in body of request. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createCreditNoteAllocationAsync($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createCreditNoteAllocationAsync($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createCreditNoteAllocationAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key, $summarize_errors)
+        return $this->createCreditNoteAllocationAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -4893,14 +4893,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with array of Allocation object in body of request. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createCreditNoteAllocationAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createCreditNoteAllocationAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Allocations';
-        $request = $this->createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -4939,11 +4939,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with array of Allocation object in body of request. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    protected function createCreditNoteAllocationRequest($xero_tenant_id, $credit_note_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -5059,15 +5059,15 @@ protected function createCreditNoteAllocationRequest($xero_tenant_id, $credit_no
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Attachments|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createCreditNoteAttachmentByFileName($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createCreditNoteAttachmentByFileName($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        list($response) = $this->createCreditNoteAttachmentByFileNameWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key, $include_online);
+        list($response) = $this->createCreditNoteAttachmentByFileNameWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online, $idempotency_key);
         return $response;
     }
     /**
@@ -5077,15 +5077,15 @@ public function createCreditNoteAttachmentByFileName($xero_tenant_id, $credit_no
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Attachments|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createCreditNoteAttachmentByFileNameWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createCreditNoteAttachmentByFileNameWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        $request = $this->createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key, $include_online);
+        $request = $this->createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -5177,14 +5177,14 @@ public function createCreditNoteAttachmentByFileNameWithHttpInfo($xero_tenant_id
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createCreditNoteAttachmentByFileNameAsync($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createCreditNoteAttachmentByFileNameAsync($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        return $this->createCreditNoteAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key, $include_online)
+        return $this->createCreditNoteAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -5198,14 +5198,14 @@ function ($response) {
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createCreditNoteAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createCreditNoteAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Attachments';
-        $request = $this->createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key, $include_online);
+        $request = $this->createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -5245,11 +5245,11 @@ function ($exception) {
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    protected function createCreditNoteAttachmentByFileNameRequest($xero_tenant_id, $credit_note_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -5669,16 +5669,16 @@ protected function createCreditNoteHistoryRequest($xero_tenant_id, $credit_note_
      * Creates a new credit note
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes Credit Notes with array of CreditNote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createCreditNotes($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createCreditNotes($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->createCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->createCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -5686,16 +5686,16 @@ public function createCreditNotes($xero_tenant_id, $credit_notes, $idempotency_k
      * Creates a new credit note
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes Credit Notes with array of CreditNote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->createCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -5785,15 +5785,15 @@ public function createCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $i
      * Creates a new credit note
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes Credit Notes with array of CreditNote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createCreditNotesAsync($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createCreditNotesAsync($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->createCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->createCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -5805,15 +5805,15 @@ function ($response) {
      * Creates a new credit note
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes Credit Notes with array of CreditNote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\CreditNotes';
-        $request = $this->createCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -5851,12 +5851,12 @@ function ($exception) {
      * Create request for operation 'createCreditNotes'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes Credit Notes with array of CreditNote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function createCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -6214,15 +6214,15 @@ protected function createCurrencyRequest($xero_tenant_id, $currency, $idempotenc
      * Creates new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Employees|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createEmployees($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function createEmployees($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createEmployeesWithHttpInfo($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        list($response) = $this->createEmployeesWithHttpInfo($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -6230,15 +6230,15 @@ public function createEmployees($xero_tenant_id, $employees, $idempotency_key =
      * Creates new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Employees|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createEmployeesWithHttpInfo($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function createEmployeesWithHttpInfo($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createEmployeesRequest($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        $request = $this->createEmployeesRequest($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -6328,14 +6328,14 @@ public function createEmployeesWithHttpInfo($xero_tenant_id, $employees, $idempo
      * Creates new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createEmployeesAsync($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function createEmployeesAsync($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $idempotency_key, $summarize_errors)
+        return $this->createEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -6347,14 +6347,14 @@ function ($response) {
      * Creates new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function createEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Employees';
-        $request = $this->createEmployeesRequest($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        $request = $this->createEmployeesRequest($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -6392,11 +6392,11 @@ function ($exception) {
      * Create request for operation 'createEmployees'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createEmployeesRequest($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    protected function createEmployeesRequest($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -7044,15 +7044,15 @@ protected function createExpenseClaimsRequest($xero_tenant_id, $expense_claims,
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Attachments|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createInvoiceAttachmentByFileName($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createInvoiceAttachmentByFileName($xero_tenant_id, $invoice_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        list($response) = $this->createInvoiceAttachmentByFileNameWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key, $include_online);
+        list($response) = $this->createInvoiceAttachmentByFileNameWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $include_online, $idempotency_key);
         return $response;
     }
     /**
@@ -7062,15 +7062,15 @@ public function createInvoiceAttachmentByFileName($xero_tenant_id, $invoice_id,
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Attachments|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createInvoiceAttachmentByFileNameWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createInvoiceAttachmentByFileNameWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        $request = $this->createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key, $include_online);
+        $request = $this->createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $include_online, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -7162,14 +7162,14 @@ public function createInvoiceAttachmentByFileNameWithHttpInfo($xero_tenant_id, $
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createInvoiceAttachmentByFileNameAsync($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createInvoiceAttachmentByFileNameAsync($xero_tenant_id, $invoice_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
-        return $this->createInvoiceAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key, $include_online)
+        return $this->createInvoiceAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $include_online, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -7183,14 +7183,14 @@ function ($response) {
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createInvoiceAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    public function createInvoiceAttachmentByFileNameAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Attachments';
-        $request = $this->createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key, $include_online);
+        $request = $this->createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $include_online, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -7230,11 +7230,11 @@ function ($exception) {
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  string $file_name Name of the attachment (required)
      * @param  string $body Byte array of file in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $include_online Allows an attachment to be seen by the end customer within their online invoice (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $idempotency_key = null, $include_online = false)
+    protected function createInvoiceAttachmentByFileNameRequest($xero_tenant_id, $invoice_id, $file_name, $body, $include_online = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -7654,16 +7654,16 @@ protected function createInvoiceHistoryRequest($xero_tenant_id, $invoice_id, $hi
      * Creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices Invoices with an array of invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createInvoices($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createInvoices($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->createInvoicesWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->createInvoicesWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -7671,16 +7671,16 @@ public function createInvoices($xero_tenant_id, $invoices, $idempotency_key = nu
      * Creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices Invoices with an array of invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createInvoicesWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createInvoicesWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->createInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -7770,15 +7770,15 @@ public function createInvoicesWithHttpInfo($xero_tenant_id, $invoices, $idempote
      * Creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices Invoices with an array of invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createInvoicesAsync($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createInvoicesAsync($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->createInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->createInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -7790,15 +7790,15 @@ function ($response) {
      * Creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices Invoices with an array of invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Invoices';
-        $request = $this->createInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -7836,12 +7836,12 @@ function ($exception) {
      * Create request for operation 'createInvoices'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices Invoices with an array of invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function createInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -8218,16 +8218,16 @@ protected function createItemHistoryRequest($xero_tenant_id, $item_id, $history_
      * Creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items Items with an array of Item objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createItems($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createItems($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->createItemsWithHttpInfo($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->createItemsWithHttpInfo($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -8235,16 +8235,16 @@ public function createItems($xero_tenant_id, $items, $idempotency_key = null, $s
      * Creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items Items with an array of Item objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createItemsWithHttpInfo($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createItemsWithHttpInfo($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->createItemsRequest($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createItemsRequest($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -8334,15 +8334,15 @@ public function createItemsWithHttpInfo($xero_tenant_id, $items, $idempotency_ke
      * Creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items Items with an array of Item objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createItemsAsync($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createItemsAsync($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->createItemsAsyncWithHttpInfo($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->createItemsAsyncWithHttpInfo($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -8354,15 +8354,15 @@ function ($response) {
      * Creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items Items with an array of Item objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createItemsAsyncWithHttpInfo($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function createItemsAsyncWithHttpInfo($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Items';
-        $request = $this->createItemsRequest($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->createItemsRequest($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -8400,12 +8400,12 @@ function ($exception) {
      * Create request for operation 'createItems'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items Items with an array of Item objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createItemsRequest($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function createItemsRequest($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -9385,15 +9385,15 @@ protected function createManualJournalHistoryRecordRequest($xero_tenant_id, $man
      * Creates one or more manual journals
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\ManualJournals|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createManualJournals($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function createManualJournals($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        list($response) = $this->createManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -9401,15 +9401,15 @@ public function createManualJournals($xero_tenant_id, $manual_journals, $idempot
      * Creates one or more manual journals
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\ManualJournals|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function createManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        $request = $this->createManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -9499,14 +9499,14 @@ public function createManualJournalsWithHttpInfo($xero_tenant_id, $manual_journa
      * Creates one or more manual journals
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createManualJournalsAsync($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function createManualJournalsAsync($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors)
+        return $this->createManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -9518,14 +9518,14 @@ function ($response) {
      * Creates one or more manual journals
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function createManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\ManualJournals';
-        $request = $this->createManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        $request = $this->createManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -9563,11 +9563,11 @@ function ($exception) {
      * Create request for operation 'createManualJournals'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    protected function createManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -9668,15 +9668,15 @@ protected function createManualJournalsRequest($xero_tenant_id, $manual_journals
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $overpayment_id Unique identifier for a Overpayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations array with Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createOverpaymentAllocations($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createOverpaymentAllocations($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createOverpaymentAllocationsWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key, $summarize_errors);
+        list($response) = $this->createOverpaymentAllocationsWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -9685,15 +9685,15 @@ public function createOverpaymentAllocations($xero_tenant_id, $overpayment_id, $
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $overpayment_id Unique identifier for a Overpayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations array with Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createOverpaymentAllocationsWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createOverpaymentAllocationsWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -9784,14 +9784,14 @@ public function createOverpaymentAllocationsWithHttpInfo($xero_tenant_id, $overp
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $overpayment_id Unique identifier for a Overpayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations array with Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createOverpaymentAllocationsAsync($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createOverpaymentAllocationsAsync($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createOverpaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key, $summarize_errors)
+        return $this->createOverpaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -9804,14 +9804,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $overpayment_id Unique identifier for a Overpayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations array with Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createOverpaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createOverpaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Allocations';
-        $request = $this->createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -9850,11 +9850,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $overpayment_id Unique identifier for a Overpayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations array with Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    protected function createOverpaymentAllocationsRequest($xero_tenant_id, $overpayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -11098,15 +11098,15 @@ protected function createPaymentServiceRequest($xero_tenant_id, $payment_service
      * Creates multiple payments for invoices or credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Payments $payments Payments array with Payment object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Payments|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createPayments($xero_tenant_id, $payments, $idempotency_key = null, $summarize_errors = false)
+    public function createPayments($xero_tenant_id, $payments, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createPaymentsWithHttpInfo($xero_tenant_id, $payments, $idempotency_key, $summarize_errors);
+        list($response) = $this->createPaymentsWithHttpInfo($xero_tenant_id, $payments, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -11114,15 +11114,15 @@ public function createPayments($xero_tenant_id, $payments, $idempotency_key = nu
      * Creates multiple payments for invoices or credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Payments $payments Payments array with Payment object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Payments|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createPaymentsWithHttpInfo($xero_tenant_id, $payments, $idempotency_key = null, $summarize_errors = false)
+    public function createPaymentsWithHttpInfo($xero_tenant_id, $payments, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createPaymentsRequest($xero_tenant_id, $payments, $idempotency_key, $summarize_errors);
+        $request = $this->createPaymentsRequest($xero_tenant_id, $payments, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -11212,14 +11212,14 @@ public function createPaymentsWithHttpInfo($xero_tenant_id, $payments, $idempote
      * Creates multiple payments for invoices or credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Payments $payments Payments array with Payment object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createPaymentsAsync($xero_tenant_id, $payments, $idempotency_key = null, $summarize_errors = false)
+    public function createPaymentsAsync($xero_tenant_id, $payments, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createPaymentsAsyncWithHttpInfo($xero_tenant_id, $payments, $idempotency_key, $summarize_errors)
+        return $this->createPaymentsAsyncWithHttpInfo($xero_tenant_id, $payments, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -11231,14 +11231,14 @@ function ($response) {
      * Creates multiple payments for invoices or credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Payments $payments Payments array with Payment object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createPaymentsAsyncWithHttpInfo($xero_tenant_id, $payments, $idempotency_key = null, $summarize_errors = false)
+    public function createPaymentsAsyncWithHttpInfo($xero_tenant_id, $payments, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Payments';
-        $request = $this->createPaymentsRequest($xero_tenant_id, $payments, $idempotency_key, $summarize_errors);
+        $request = $this->createPaymentsRequest($xero_tenant_id, $payments, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -11276,11 +11276,11 @@ function ($exception) {
      * Create request for operation 'createPayments'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Payments $payments Payments array with Payment object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createPaymentsRequest($xero_tenant_id, $payments, $idempotency_key = null, $summarize_errors = false)
+    protected function createPaymentsRequest($xero_tenant_id, $payments, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -11381,15 +11381,15 @@ protected function createPaymentsRequest($xero_tenant_id, $payments, $idempotenc
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $prepayment_id Unique identifier for a PrePayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with an array of Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createPrepaymentAllocations($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createPrepaymentAllocations($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createPrepaymentAllocationsWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key, $summarize_errors);
+        list($response) = $this->createPrepaymentAllocationsWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -11398,15 +11398,15 @@ public function createPrepaymentAllocations($xero_tenant_id, $prepayment_id, $al
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $prepayment_id Unique identifier for a PrePayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with an array of Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Allocations|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createPrepaymentAllocationsWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createPrepaymentAllocationsWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -11497,14 +11497,14 @@ public function createPrepaymentAllocationsWithHttpInfo($xero_tenant_id, $prepay
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $prepayment_id Unique identifier for a PrePayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with an array of Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createPrepaymentAllocationsAsync($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createPrepaymentAllocationsAsync($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createPrepaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key, $summarize_errors)
+        return $this->createPrepaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -11517,14 +11517,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $prepayment_id Unique identifier for a PrePayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with an array of Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createPrepaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    public function createPrepaymentAllocationsAsyncWithHttpInfo($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Allocations';
-        $request = $this->createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key, $summarize_errors);
+        $request = $this->createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -11563,11 +11563,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $prepayment_id Unique identifier for a PrePayment (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Allocations $allocations Allocations with an array of Allocation object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $idempotency_key = null, $summarize_errors = false)
+    protected function createPrepaymentAllocationsRequest($xero_tenant_id, $prepayment_id, $allocations, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -12576,15 +12576,15 @@ protected function createPurchaseOrderHistoryRequest($xero_tenant_id, $purchase_
      * Creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders PurchaseOrders with an array of PurchaseOrder object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createPurchaseOrders($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function createPurchaseOrders($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createPurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        list($response) = $this->createPurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -12592,15 +12592,15 @@ public function createPurchaseOrders($xero_tenant_id, $purchase_orders, $idempot
      * Creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders PurchaseOrders with an array of PurchaseOrder object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createPurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function createPurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        $request = $this->createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -12690,14 +12690,14 @@ public function createPurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orde
      * Creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders PurchaseOrders with an array of PurchaseOrder object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createPurchaseOrdersAsync($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function createPurchaseOrdersAsync($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createPurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors)
+        return $this->createPurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -12709,14 +12709,14 @@ function ($response) {
      * Creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders PurchaseOrders with an array of PurchaseOrder object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createPurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function createPurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders';
-        $request = $this->createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        $request = $this->createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -12754,11 +12754,11 @@ function ($exception) {
      * Create request for operation 'createPurchaseOrders'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders PurchaseOrders with an array of PurchaseOrder object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    protected function createPurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -13461,15 +13461,15 @@ protected function createQuoteHistoryRequest($xero_tenant_id, $quote_id, $histor
      * Create one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes Quotes with an array of Quote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Quotes|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createQuotes($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function createQuotes($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createQuotesWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        list($response) = $this->createQuotesWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -13477,15 +13477,15 @@ public function createQuotes($xero_tenant_id, $quotes, $idempotency_key = null,
      * Create one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes Quotes with an array of Quote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Quotes|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createQuotesWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function createQuotesWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createQuotesRequest($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        $request = $this->createQuotesRequest($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -13575,14 +13575,14 @@ public function createQuotesWithHttpInfo($xero_tenant_id, $quotes, $idempotency_
      * Create one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes Quotes with an array of Quote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createQuotesAsync($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function createQuotesAsync($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors)
+        return $this->createQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -13594,14 +13594,14 @@ function ($response) {
      * Create one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes Quotes with an array of Quote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function createQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Quotes';
-        $request = $this->createQuotesRequest($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        $request = $this->createQuotesRequest($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -13639,11 +13639,11 @@ function ($exception) {
      * Create request for operation 'createQuotes'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes Quotes with an array of Quote object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createQuotesRequest($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    protected function createQuotesRequest($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -13743,15 +13743,15 @@ protected function createQuotesRequest($xero_tenant_id, $quotes, $idempotency_ke
      * Creates draft expense claim receipts for any user
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts Receipts with an array of Receipt object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Receipts|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createReceipt($xero_tenant_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function createReceipt($xero_tenant_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->createReceiptWithHttpInfo($xero_tenant_id, $receipts, $idempotency_key, $unitdp);
+        list($response) = $this->createReceiptWithHttpInfo($xero_tenant_id, $receipts, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -13759,15 +13759,15 @@ public function createReceipt($xero_tenant_id, $receipts, $idempotency_key = nul
      * Creates draft expense claim receipts for any user
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts Receipts with an array of Receipt object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Receipts|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createReceiptWithHttpInfo($xero_tenant_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function createReceiptWithHttpInfo($xero_tenant_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->createReceiptRequest($xero_tenant_id, $receipts, $idempotency_key, $unitdp);
+        $request = $this->createReceiptRequest($xero_tenant_id, $receipts, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -13857,14 +13857,14 @@ public function createReceiptWithHttpInfo($xero_tenant_id, $receipts, $idempoten
      * Creates draft expense claim receipts for any user
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts Receipts with an array of Receipt object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createReceiptAsync($xero_tenant_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function createReceiptAsync($xero_tenant_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        return $this->createReceiptAsyncWithHttpInfo($xero_tenant_id, $receipts, $idempotency_key, $unitdp)
+        return $this->createReceiptAsyncWithHttpInfo($xero_tenant_id, $receipts, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -13876,14 +13876,14 @@ function ($response) {
      * Creates draft expense claim receipts for any user
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts Receipts with an array of Receipt object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createReceiptAsyncWithHttpInfo($xero_tenant_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function createReceiptAsyncWithHttpInfo($xero_tenant_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Receipts';
-        $request = $this->createReceiptRequest($xero_tenant_id, $receipts, $idempotency_key, $unitdp);
+        $request = $this->createReceiptRequest($xero_tenant_id, $receipts, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -13921,11 +13921,11 @@ function ($exception) {
      * Create request for operation 'createReceipt'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts Receipts with an array of Receipt object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createReceiptRequest($xero_tenant_id, $receipts, $idempotency_key = null, $unitdp = null)
+    protected function createReceiptRequest($xero_tenant_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -15231,15 +15231,15 @@ protected function createRepeatingInvoiceHistoryRequest($xero_tenant_id, $repeat
      * Creates one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function createRepeatingInvoices($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function createRepeatingInvoices($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->createRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        list($response) = $this->createRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -15247,15 +15247,15 @@ public function createRepeatingInvoices($xero_tenant_id, $repeating_invoices, $i
      * Creates one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function createRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        $request = $this->createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -15345,14 +15345,14 @@ public function createRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_
      * Creates one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createRepeatingInvoicesAsync($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function createRepeatingInvoicesAsync($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->createRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors)
+        return $this->createRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -15364,14 +15364,14 @@ function ($response) {
      * Creates one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function createRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices';
-        $request = $this->createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        $request = $this->createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -15409,11 +15409,11 @@ function ($exception) {
      * Create request for operation 'createRepeatingInvoices'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    protected function createRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -53947,15 +53947,15 @@ protected function updateAccountAttachmentByFileNameRequest($xero_tenant_id, $ac
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $bank_transaction_id Xero generated unique identifier for a bank transaction (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateBankTransaction($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key = null, $unitdp = null)
+    public function updateBankTransaction($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateBankTransactionWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key, $unitdp);
+        list($response) = $this->updateBankTransactionWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -53964,15 +53964,15 @@ public function updateBankTransaction($xero_tenant_id, $bank_transaction_id, $ba
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $bank_transaction_id Xero generated unique identifier for a bank transaction (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateBankTransactionWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key = null, $unitdp = null)
+    public function updateBankTransactionWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key, $unitdp);
+        $request = $this->updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -54063,14 +54063,14 @@ public function updateBankTransactionWithHttpInfo($xero_tenant_id, $bank_transac
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $bank_transaction_id Xero generated unique identifier for a bank transaction (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateBankTransactionAsync($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key = null, $unitdp = null)
+    public function updateBankTransactionAsync($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateBankTransactionAsyncWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key, $unitdp)
+        return $this->updateBankTransactionAsyncWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -54083,14 +54083,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $bank_transaction_id Xero generated unique identifier for a bank transaction (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateBankTransactionAsyncWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key = null, $unitdp = null)
+    public function updateBankTransactionAsyncWithHttpInfo($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\BankTransactions';
-        $request = $this->updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key, $unitdp);
+        $request = $this->updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -54129,11 +54129,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $bank_transaction_id Xero generated unique identifier for a bank transaction (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $idempotency_key = null, $unitdp = null)
+    protected function updateBankTransactionRequest($xero_tenant_id, $bank_transaction_id, $bank_transactions, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -55761,15 +55761,15 @@ protected function updateContactGroupRequest($xero_tenant_id, $contact_group_id,
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes containing credit note details to update (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateCreditNote($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key = null, $unitdp = null)
+    public function updateCreditNote($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateCreditNoteWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key, $unitdp);
+        list($response) = $this->updateCreditNoteWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -55778,15 +55778,15 @@ public function updateCreditNote($xero_tenant_id, $credit_note_id, $credit_notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes containing credit note details to update (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateCreditNoteWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key = null, $unitdp = null)
+    public function updateCreditNoteWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key, $unitdp);
+        $request = $this->updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -55877,14 +55877,14 @@ public function updateCreditNoteWithHttpInfo($xero_tenant_id, $credit_note_id, $
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes containing credit note details to update (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateCreditNoteAsync($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key = null, $unitdp = null)
+    public function updateCreditNoteAsync($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateCreditNoteAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key, $unitdp)
+        return $this->updateCreditNoteAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -55897,14 +55897,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes containing credit note details to update (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateCreditNoteAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key = null, $unitdp = null)
+    public function updateCreditNoteAsyncWithHttpInfo($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\CreditNotes';
-        $request = $this->updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key, $unitdp);
+        $request = $this->updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -55943,11 +55943,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $credit_note_id Unique identifier for a Credit Note (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes containing credit note details to update (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $idempotency_key = null, $unitdp = null)
+    protected function updateCreditNoteRequest($xero_tenant_id, $credit_note_id, $credit_notes, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -56665,15 +56665,15 @@ protected function updateExpenseClaimRequest($xero_tenant_id, $expense_claim_id,
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateInvoice($xero_tenant_id, $invoice_id, $invoices, $idempotency_key = null, $unitdp = null)
+    public function updateInvoice($xero_tenant_id, $invoice_id, $invoices, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateInvoiceWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $idempotency_key, $unitdp);
+        list($response) = $this->updateInvoiceWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -56682,15 +56682,15 @@ public function updateInvoice($xero_tenant_id, $invoice_id, $invoices, $idempote
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateInvoiceWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $idempotency_key = null, $unitdp = null)
+    public function updateInvoiceWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $idempotency_key, $unitdp);
+        $request = $this->updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -56781,14 +56781,14 @@ public function updateInvoiceWithHttpInfo($xero_tenant_id, $invoice_id, $invoice
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateInvoiceAsync($xero_tenant_id, $invoice_id, $invoices, $idempotency_key = null, $unitdp = null)
+    public function updateInvoiceAsync($xero_tenant_id, $invoice_id, $invoices, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateInvoiceAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $idempotency_key, $unitdp)
+        return $this->updateInvoiceAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -56801,14 +56801,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateInvoiceAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $idempotency_key = null, $unitdp = null)
+    public function updateInvoiceAsyncWithHttpInfo($xero_tenant_id, $invoice_id, $invoices, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Invoices';
-        $request = $this->updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $idempotency_key, $unitdp);
+        $request = $this->updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -56847,11 +56847,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $invoice_id Unique identifier for an Invoice (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $idempotency_key = null, $unitdp = null)
+    protected function updateInvoiceRequest($xero_tenant_id, $invoice_id, $invoices, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -57277,15 +57277,15 @@ protected function updateInvoiceAttachmentByFileNameRequest($xero_tenant_id, $in
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $item_id Unique identifier for an Item (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateItem($xero_tenant_id, $item_id, $items, $idempotency_key = null, $unitdp = null)
+    public function updateItem($xero_tenant_id, $item_id, $items, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateItemWithHttpInfo($xero_tenant_id, $item_id, $items, $idempotency_key, $unitdp);
+        list($response) = $this->updateItemWithHttpInfo($xero_tenant_id, $item_id, $items, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -57294,15 +57294,15 @@ public function updateItem($xero_tenant_id, $item_id, $items, $idempotency_key =
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $item_id Unique identifier for an Item (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateItemWithHttpInfo($xero_tenant_id, $item_id, $items, $idempotency_key = null, $unitdp = null)
+    public function updateItemWithHttpInfo($xero_tenant_id, $item_id, $items, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateItemRequest($xero_tenant_id, $item_id, $items, $idempotency_key, $unitdp);
+        $request = $this->updateItemRequest($xero_tenant_id, $item_id, $items, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -57393,14 +57393,14 @@ public function updateItemWithHttpInfo($xero_tenant_id, $item_id, $items, $idemp
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $item_id Unique identifier for an Item (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateItemAsync($xero_tenant_id, $item_id, $items, $idempotency_key = null, $unitdp = null)
+    public function updateItemAsync($xero_tenant_id, $item_id, $items, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateItemAsyncWithHttpInfo($xero_tenant_id, $item_id, $items, $idempotency_key, $unitdp)
+        return $this->updateItemAsyncWithHttpInfo($xero_tenant_id, $item_id, $items, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -57413,14 +57413,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $item_id Unique identifier for an Item (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateItemAsyncWithHttpInfo($xero_tenant_id, $item_id, $items, $idempotency_key = null, $unitdp = null)
+    public function updateItemAsyncWithHttpInfo($xero_tenant_id, $item_id, $items, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Items';
-        $request = $this->updateItemRequest($xero_tenant_id, $item_id, $items, $idempotency_key, $unitdp);
+        $request = $this->updateItemRequest($xero_tenant_id, $item_id, $items, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -57459,11 +57459,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $item_id Unique identifier for an Item (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateItemRequest($xero_tenant_id, $item_id, $items, $idempotency_key = null, $unitdp = null)
+    protected function updateItemRequest($xero_tenant_id, $item_id, $items, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -58472,16 +58472,16 @@ protected function updateManualJournalAttachmentByFileNameRequest($xero_tenant_i
      * Updates or creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateBankTransactions($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateBankTransactions($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->updateOrCreateBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -58489,16 +58489,16 @@ public function updateOrCreateBankTransactions($xero_tenant_id, $bank_transactio
      * Updates or creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\BankTransactions|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateBankTransactionsWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -58588,15 +58588,15 @@ public function updateOrCreateBankTransactionsWithHttpInfo($xero_tenant_id, $ban
      * Updates or creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateBankTransactionsAsync($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateBankTransactionsAsync($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateOrCreateBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->updateOrCreateBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -58608,15 +58608,15 @@ function ($response) {
      * Updates or creates one or more spent or received money transaction
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateBankTransactionsAsyncWithHttpInfo($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\BankTransactions';
-        $request = $this->updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -58654,12 +58654,12 @@ function ($exception) {
      * Create request for operation 'updateOrCreateBankTransactions'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\BankTransactions $bank_transactions (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_transactions, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -58763,15 +58763,15 @@ protected function updateOrCreateBankTransactionsRequest($xero_tenant_id, $bank_
      * Updates or creates one or more contacts in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts contacts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Contacts|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateContacts($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateContacts($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateContactsWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreateContactsWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -58779,15 +58779,15 @@ public function updateOrCreateContacts($xero_tenant_id, $contacts, $idempotency_
      * Updates or creates one or more contacts in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Contacts|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateContactsWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateContactsWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateContactsRequest($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateContactsRequest($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -58877,14 +58877,14 @@ public function updateOrCreateContactsWithHttpInfo($xero_tenant_id, $contacts, $
      * Updates or creates one or more contacts in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateContactsAsync($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateContactsAsync($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreateContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreateContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -58896,14 +58896,14 @@ function ($response) {
      * Updates or creates one or more contacts in a Xero organisation
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateContactsAsyncWithHttpInfo($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Contacts';
-        $request = $this->updateOrCreateContactsRequest($xero_tenant_id, $contacts, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateContactsRequest($xero_tenant_id, $contacts, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -58941,11 +58941,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreateContacts'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Contacts $contacts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateContactsRequest($xero_tenant_id, $contacts, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreateContactsRequest($xero_tenant_id, $contacts, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -59045,16 +59045,16 @@ protected function updateOrCreateContactsRequest($xero_tenant_id, $contacts, $id
      * Updates or creates one or more credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes with a single CreditNote object. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateCreditNotes($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateCreditNotes($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->updateOrCreateCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -59062,16 +59062,16 @@ public function updateOrCreateCreditNotes($xero_tenant_id, $credit_notes, $idemp
      * Updates or creates one or more credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes with a single CreditNote object. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\CreditNotes|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateCreditNotesWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -59161,15 +59161,15 @@ public function updateOrCreateCreditNotesWithHttpInfo($xero_tenant_id, $credit_n
      * Updates or creates one or more credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes with a single CreditNote object. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateCreditNotesAsync($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateCreditNotesAsync($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateOrCreateCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->updateOrCreateCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -59181,15 +59181,15 @@ function ($response) {
      * Updates or creates one or more credit notes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes with a single CreditNote object. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateCreditNotesAsyncWithHttpInfo($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\CreditNotes';
-        $request = $this->updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -59227,12 +59227,12 @@ function ($exception) {
      * Create request for operation 'updateOrCreateCreditNotes'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\CreditNotes $credit_notes an array of Credit Notes with a single CreditNote object. (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_notes, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -59336,15 +59336,15 @@ protected function updateOrCreateCreditNotesRequest($xero_tenant_id, $credit_not
      * Creates a single new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Employees|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateEmployees($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateEmployees($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateEmployeesWithHttpInfo($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreateEmployeesWithHttpInfo($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -59352,15 +59352,15 @@ public function updateOrCreateEmployees($xero_tenant_id, $employees, $idempotenc
      * Creates a single new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Employees|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateEmployeesWithHttpInfo($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateEmployeesWithHttpInfo($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -59450,14 +59450,14 @@ public function updateOrCreateEmployeesWithHttpInfo($xero_tenant_id, $employees,
      * Creates a single new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateEmployeesAsync($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateEmployeesAsync($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreateEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreateEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -59469,14 +59469,14 @@ function ($response) {
      * Creates a single new employees used in Xero payrun
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateEmployeesAsyncWithHttpInfo($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Employees';
-        $request = $this->updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -59514,11 +59514,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreateEmployees'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Employees $employees Employees with array of Employee object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -59618,16 +59618,16 @@ protected function updateOrCreateEmployeesRequest($xero_tenant_id, $employees, $
      * Updates or creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateInvoices($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateInvoices($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateInvoicesWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->updateOrCreateInvoicesWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -59635,16 +59635,16 @@ public function updateOrCreateInvoices($xero_tenant_id, $invoices, $idempotency_
      * Updates or creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Invoices|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateInvoicesWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateInvoicesWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -59734,15 +59734,15 @@ public function updateOrCreateInvoicesWithHttpInfo($xero_tenant_id, $invoices, $
      * Updates or creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateInvoicesAsync($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateInvoicesAsync($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateOrCreateInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->updateOrCreateInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -59754,15 +59754,15 @@ function ($response) {
      * Updates or creates one or more sales invoices or purchase bills
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateInvoicesAsyncWithHttpInfo($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Invoices';
-        $request = $this->updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -59800,12 +59800,12 @@ function ($exception) {
      * Create request for operation 'updateOrCreateInvoices'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Invoices $invoices (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -59909,16 +59909,16 @@ protected function updateOrCreateInvoicesRequest($xero_tenant_id, $invoices, $id
      * Updates or creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateItems($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateItems($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateItemsWithHttpInfo($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        list($response) = $this->updateOrCreateItemsWithHttpInfo($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -59926,16 +59926,16 @@ public function updateOrCreateItems($xero_tenant_id, $items, $idempotency_key =
      * Updates or creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Items|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateItemsWithHttpInfo($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateItemsWithHttpInfo($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateItemsRequest($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateItemsRequest($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -60025,15 +60025,15 @@ public function updateOrCreateItemsWithHttpInfo($xero_tenant_id, $items, $idempo
      * Updates or creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateItemsAsync($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateItemsAsync($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateOrCreateItemsAsyncWithHttpInfo($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp)
+        return $this->updateOrCreateItemsAsyncWithHttpInfo($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -60045,15 +60045,15 @@ function ($response) {
      * Updates or creates one or more items
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateItemsAsyncWithHttpInfo($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    public function updateOrCreateItemsAsyncWithHttpInfo($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Items';
-        $request = $this->updateOrCreateItemsRequest($xero_tenant_id, $items, $idempotency_key, $summarize_errors, $unitdp);
+        $request = $this->updateOrCreateItemsRequest($xero_tenant_id, $items, $summarize_errors, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -60091,12 +60091,12 @@ function ($exception) {
      * Create request for operation 'updateOrCreateItems'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Items $items (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateItemsRequest($xero_tenant_id, $items, $idempotency_key = null, $summarize_errors = false, $unitdp = null)
+    protected function updateOrCreateItemsRequest($xero_tenant_id, $items, $summarize_errors = false, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -60200,15 +60200,15 @@ protected function updateOrCreateItemsRequest($xero_tenant_id, $items, $idempote
      * Updates or creates a single manual journal
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\ManualJournals|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateManualJournals($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateManualJournals($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreateManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -60216,15 +60216,15 @@ public function updateOrCreateManualJournals($xero_tenant_id, $manual_journals,
      * Updates or creates a single manual journal
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\ManualJournals|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateManualJournalsWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -60314,14 +60314,14 @@ public function updateOrCreateManualJournalsWithHttpInfo($xero_tenant_id, $manua
      * Updates or creates a single manual journal
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateManualJournalsAsync($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateManualJournalsAsync($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreateManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreateManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -60333,14 +60333,14 @@ function ($response) {
      * Updates or creates a single manual journal
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateManualJournalsAsyncWithHttpInfo($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\ManualJournals';
-        $request = $this->updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -60378,11 +60378,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreateManualJournals'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\ManualJournals $manual_journals ManualJournals array with ManualJournal object in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_journals, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -60482,15 +60482,15 @@ protected function updateOrCreateManualJournalsRequest($xero_tenant_id, $manual_
      * Updates or creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders purchase_orders (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreatePurchaseOrders($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreatePurchaseOrders($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreatePurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreatePurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -60498,15 +60498,15 @@ public function updateOrCreatePurchaseOrders($xero_tenant_id, $purchase_orders,
      * Updates or creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreatePurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreatePurchaseOrdersWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -60596,14 +60596,14 @@ public function updateOrCreatePurchaseOrdersWithHttpInfo($xero_tenant_id, $purch
      * Updates or creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreatePurchaseOrdersAsync($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreatePurchaseOrdersAsync($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreatePurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreatePurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -60615,14 +60615,14 @@ function ($response) {
      * Updates or creates one or more purchase orders
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreatePurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreatePurchaseOrdersAsyncWithHttpInfo($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders';
-        $request = $this->updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -60660,11 +60660,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreatePurchaseOrders'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\PurchaseOrders $purchase_orders (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchase_orders, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -60764,15 +60764,15 @@ protected function updateOrCreatePurchaseOrdersRequest($xero_tenant_id, $purchas
      * Updates or creates one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes quotes (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Quotes|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateQuotes($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateQuotes($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateQuotesWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreateQuotesWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -60780,15 +60780,15 @@ public function updateOrCreateQuotes($xero_tenant_id, $quotes, $idempotency_key
      * Updates or creates one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Quotes|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateQuotesWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateQuotesWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -60878,14 +60878,14 @@ public function updateOrCreateQuotesWithHttpInfo($xero_tenant_id, $quotes, $idem
      * Updates or creates one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateQuotesAsync($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateQuotesAsync($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreateQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreateQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -60897,14 +60897,14 @@ function ($response) {
      * Updates or creates one or more quotes
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateQuotesAsyncWithHttpInfo($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Quotes';
-        $request = $this->updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -60942,11 +60942,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreateQuotes'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Quotes $quotes (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -61046,15 +61046,15 @@ protected function updateOrCreateQuotesRequest($xero_tenant_id, $quotes, $idempo
      * Creates or deletes one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateOrCreateRepeatingInvoices($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateRepeatingInvoices($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        list($response) = $this->updateOrCreateRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        list($response) = $this->updateOrCreateRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         return $response;
     }
     /**
@@ -61062,15 +61062,15 @@ public function updateOrCreateRepeatingInvoices($xero_tenant_id, $repeating_invo
      * Creates or deletes one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateOrCreateRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateRepeatingInvoicesWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        $request = $this->updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -61160,14 +61160,14 @@ public function updateOrCreateRepeatingInvoicesWithHttpInfo($xero_tenant_id, $re
      * Creates or deletes one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateOrCreateRepeatingInvoicesAsync($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateRepeatingInvoicesAsync($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
-        return $this->updateOrCreateRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors)
+        return $this->updateOrCreateRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -61179,14 +61179,14 @@ function ($response) {
      * Creates or deletes one or more repeating invoice templates
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateOrCreateRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    public function updateOrCreateRepeatingInvoicesAsyncWithHttpInfo($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices';
-        $request = $this->updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key, $summarize_errors);
+        $request = $this->updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -61224,11 +61224,11 @@ function ($exception) {
      * Create request for operation 'updateOrCreateRepeatingInvoices'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\RepeatingInvoices $repeating_invoices RepeatingInvoices with an array of repeating invoice objects in body of request (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  bool $summarize_errors If false return 200 OK and mix of successfully created objects and any with validation errors (optional, default to false)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $idempotency_key = null, $summarize_errors = false)
+    protected function updateOrCreateRepeatingInvoicesRequest($xero_tenant_id, $repeating_invoices, $summarize_errors = false, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -62535,15 +62535,15 @@ protected function updateQuoteAttachmentByFileNameRequest($xero_tenant_id, $quot
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $receipt_id Unique identifier for a Receipt (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts receipts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Accounting\Receipts|\XeroAPI\XeroPHP\Models\Accounting\Error
      */
-    public function updateReceipt($xero_tenant_id, $receipt_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function updateReceipt($xero_tenant_id, $receipt_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        list($response) = $this->updateReceiptWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $idempotency_key, $unitdp);
+        list($response) = $this->updateReceiptWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $unitdp, $idempotency_key);
         return $response;
     }
     /**
@@ -62552,15 +62552,15 @@ public function updateReceipt($xero_tenant_id, $receipt_id, $receipts, $idempote
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $receipt_id Unique identifier for a Receipt (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Accounting\Receipts|\XeroAPI\XeroPHP\Models\Accounting\Error, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateReceiptWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function updateReceiptWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        $request = $this->updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $idempotency_key, $unitdp);
+        $request = $this->updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $unitdp, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -62651,14 +62651,14 @@ public function updateReceiptWithHttpInfo($xero_tenant_id, $receipt_id, $receipt
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $receipt_id Unique identifier for a Receipt (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateReceiptAsync($xero_tenant_id, $receipt_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function updateReceiptAsync($xero_tenant_id, $receipt_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
-        return $this->updateReceiptAsyncWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $idempotency_key, $unitdp)
+        return $this->updateReceiptAsyncWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $unitdp, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -62671,14 +62671,14 @@ function ($response) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $receipt_id Unique identifier for a Receipt (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateReceiptAsyncWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $idempotency_key = null, $unitdp = null)
+    public function updateReceiptAsyncWithHttpInfo($xero_tenant_id, $receipt_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Accounting\Receipts';
-        $request = $this->updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $idempotency_key, $unitdp);
+        $request = $this->updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $unitdp, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -62717,11 +62717,11 @@ function ($exception) {
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $receipt_id Unique identifier for a Receipt (required)
      * @param  \XeroAPI\XeroPHP\Models\Accounting\Receipts $receipts (required)
-     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @param  int $unitdp e.g. unitdp&#x3D;4 – (Unit Decimal Places) You can opt in to use four decimal places for unit amounts (optional)
+     * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $idempotency_key = null, $unitdp = null)
+    protected function updateReceiptRequest($xero_tenant_id, $receipt_id, $receipts, $unitdp = null, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
diff --git a/lib/Api/AppStoreApi.php b/lib/Api/AppStoreApi.php
index 3ad2cfdc..4dbc3ae4 100644
--- a/lib/Api/AppStoreApi.php
+++ b/lib/Api/AppStoreApi.php
@@ -14,7 +14,7 @@
  *
  * These endpoints are for Xero Partners to interact with the App Store Billing platform
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Api/AssetApi.php b/lib/Api/AssetApi.php
index 14126aac..52108ba9 100644
--- a/lib/Api/AssetApi.php
+++ b/lib/Api/AssetApi.php
@@ -14,7 +14,7 @@
  *
  * The Assets API exposes fixed asset related functions of the Xero Accounting application and can be used for a variety of purposes such as creating assets, retrieving asset valuations etc.
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
@@ -343,30 +343,30 @@ protected function createAssetRequest($xero_tenant_id, $asset, $idempotency_key
      * Operation createAssetType
      * adds a fixed asset type
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\Asset\AssetType
      */
-    public function createAssetType($xero_tenant_id, $idempotency_key = null, $asset_type = null)
+    public function createAssetType($xero_tenant_id, $asset_type, $idempotency_key = null)
     {
-        list($response) = $this->createAssetTypeWithHttpInfo($xero_tenant_id, $idempotency_key, $asset_type);
+        list($response) = $this->createAssetTypeWithHttpInfo($xero_tenant_id, $asset_type, $idempotency_key);
         return $response;
     }
     /**
      * Operation createAssetTypeWithHttpInfo
      * adds a fixed asset type
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\Asset\AssetType, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createAssetTypeWithHttpInfo($xero_tenant_id, $idempotency_key = null, $asset_type = null)
+    public function createAssetTypeWithHttpInfo($xero_tenant_id, $asset_type, $idempotency_key = null)
     {
-        $request = $this->createAssetTypeRequest($xero_tenant_id, $idempotency_key, $asset_type);
+        $request = $this->createAssetTypeRequest($xero_tenant_id, $asset_type, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -436,14 +436,14 @@ public function createAssetTypeWithHttpInfo($xero_tenant_id, $idempotency_key =
      * Operation createAssetTypeAsync
      * adds a fixed asset type
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createAssetTypeAsync($xero_tenant_id, $idempotency_key = null, $asset_type = null)
+    public function createAssetTypeAsync($xero_tenant_id, $asset_type, $idempotency_key = null)
     {
-        return $this->createAssetTypeAsyncWithHttpInfo($xero_tenant_id, $idempotency_key, $asset_type)
+        return $this->createAssetTypeAsyncWithHttpInfo($xero_tenant_id, $asset_type, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -454,14 +454,14 @@ function ($response) {
      * Operation createAssetTypeAsyncWithHttpInfo
      * adds a fixed asset type
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createAssetTypeAsyncWithHttpInfo($xero_tenant_id, $idempotency_key = null, $asset_type = null)
+    public function createAssetTypeAsyncWithHttpInfo($xero_tenant_id, $asset_type, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\Asset\AssetType';
-        $request = $this->createAssetTypeRequest($xero_tenant_id, $idempotency_key, $asset_type);
+        $request = $this->createAssetTypeRequest($xero_tenant_id, $asset_type, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -498,11 +498,11 @@ function ($exception) {
     /**
      * Create request for operation 'createAssetType'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\Asset\AssetType $asset_type Asset type to add (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createAssetTypeRequest($xero_tenant_id, $idempotency_key = null, $asset_type = null)
+    protected function createAssetTypeRequest($xero_tenant_id, $asset_type, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -510,6 +510,12 @@ protected function createAssetTypeRequest($xero_tenant_id, $idempotency_key = nu
                 'Missing the required parameter $xero_tenant_id when calling createAssetType'
             );
         }
+        // verify the required parameter 'asset_type' is set
+        if ($asset_type === null || (is_array($asset_type) && count($asset_type) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $asset_type when calling createAssetType'
+            );
+        }
         $resourcePath = '/AssetTypes';
         $formParams = [];
         $queryParams = [];
diff --git a/lib/Api/FilesApi.php b/lib/Api/FilesApi.php
index c7340e08..f9cab78c 100644
--- a/lib/Api/FilesApi.php
+++ b/lib/Api/FilesApi.php
@@ -14,7 +14,7 @@
  *
  * These endpoints are specific to Xero Files API
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
@@ -90,15 +90,15 @@ public function getConfig()
      * Creates a new file association
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Association $association association (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Association $association association (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\File\Association
      */
-    public function createFileAssociation($xero_tenant_id, $file_id, $idempotency_key = null, $association = null)
+    public function createFileAssociation($xero_tenant_id, $file_id, $association, $idempotency_key = null)
     {
-        list($response) = $this->createFileAssociationWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key, $association);
+        list($response) = $this->createFileAssociationWithHttpInfo($xero_tenant_id, $file_id, $association, $idempotency_key);
         return $response;
     }
     /**
@@ -106,15 +106,15 @@ public function createFileAssociation($xero_tenant_id, $file_id, $idempotency_ke
      * Creates a new file association
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\File\Association, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createFileAssociationWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key = null, $association = null)
+    public function createFileAssociationWithHttpInfo($xero_tenant_id, $file_id, $association, $idempotency_key = null)
     {
-        $request = $this->createFileAssociationRequest($xero_tenant_id, $file_id, $idempotency_key, $association);
+        $request = $this->createFileAssociationRequest($xero_tenant_id, $file_id, $association, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -185,14 +185,14 @@ public function createFileAssociationWithHttpInfo($xero_tenant_id, $file_id, $id
      * Creates a new file association
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createFileAssociationAsync($xero_tenant_id, $file_id, $idempotency_key = null, $association = null)
+    public function createFileAssociationAsync($xero_tenant_id, $file_id, $association, $idempotency_key = null)
     {
-        return $this->createFileAssociationAsyncWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key, $association)
+        return $this->createFileAssociationAsyncWithHttpInfo($xero_tenant_id, $file_id, $association, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -204,14 +204,14 @@ function ($response) {
      * Creates a new file association
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createFileAssociationAsyncWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key = null, $association = null)
+    public function createFileAssociationAsyncWithHttpInfo($xero_tenant_id, $file_id, $association, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\File\Association';
-        $request = $this->createFileAssociationRequest($xero_tenant_id, $file_id, $idempotency_key, $association);
+        $request = $this->createFileAssociationRequest($xero_tenant_id, $file_id, $association, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -249,11 +249,11 @@ function ($exception) {
      * Create request for operation 'createFileAssociation'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Association $association (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createFileAssociationRequest($xero_tenant_id, $file_id, $idempotency_key = null, $association = null)
+    protected function createFileAssociationRequest($xero_tenant_id, $file_id, $association, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -267,6 +267,12 @@ protected function createFileAssociationRequest($xero_tenant_id, $file_id, $idem
                 'Missing the required parameter $file_id when calling createFileAssociation'
             );
         }
+        // verify the required parameter 'association' is set
+        if ($association === null || (is_array($association) && count($association) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $association when calling createFileAssociation'
+            );
+        }
         $resourcePath = '/Files/{FileId}/Associations';
         $formParams = [];
         $queryParams = [];
@@ -356,30 +362,30 @@ protected function createFileAssociationRequest($xero_tenant_id, $file_id, $idem
      * Operation createFolder
      * Creates a new folder
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder folder (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder folder (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\File\Folder
      */
-    public function createFolder($xero_tenant_id, $idempotency_key = null, $folder = null)
+    public function createFolder($xero_tenant_id, $folder, $idempotency_key = null)
     {
-        list($response) = $this->createFolderWithHttpInfo($xero_tenant_id, $idempotency_key, $folder);
+        list($response) = $this->createFolderWithHttpInfo($xero_tenant_id, $folder, $idempotency_key);
         return $response;
     }
     /**
      * Operation createFolderWithHttpInfo
      * Creates a new folder
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\File\Folder, HTTP status code, HTTP response headers (array of strings)
      */
-    public function createFolderWithHttpInfo($xero_tenant_id, $idempotency_key = null, $folder = null)
+    public function createFolderWithHttpInfo($xero_tenant_id, $folder, $idempotency_key = null)
     {
-        $request = $this->createFolderRequest($xero_tenant_id, $idempotency_key, $folder);
+        $request = $this->createFolderRequest($xero_tenant_id, $folder, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -449,14 +455,14 @@ public function createFolderWithHttpInfo($xero_tenant_id, $idempotency_key = nul
      * Operation createFolderAsync
      * Creates a new folder
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function createFolderAsync($xero_tenant_id, $idempotency_key = null, $folder = null)
+    public function createFolderAsync($xero_tenant_id, $folder, $idempotency_key = null)
     {
-        return $this->createFolderAsyncWithHttpInfo($xero_tenant_id, $idempotency_key, $folder)
+        return $this->createFolderAsyncWithHttpInfo($xero_tenant_id, $folder, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -467,14 +473,14 @@ function ($response) {
      * Operation createFolderAsyncWithHttpInfo
      * Creates a new folder
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function createFolderAsyncWithHttpInfo($xero_tenant_id, $idempotency_key = null, $folder = null)
+    public function createFolderAsyncWithHttpInfo($xero_tenant_id, $folder, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\File\Folder';
-        $request = $this->createFolderRequest($xero_tenant_id, $idempotency_key, $folder);
+        $request = $this->createFolderRequest($xero_tenant_id, $folder, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -511,11 +517,11 @@ function ($exception) {
     /**
      * Create request for operation 'createFolder'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\Folder $folder (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function createFolderRequest($xero_tenant_id, $idempotency_key = null, $folder = null)
+    protected function createFolderRequest($xero_tenant_id, $folder, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -523,6 +529,12 @@ protected function createFolderRequest($xero_tenant_id, $idempotency_key = null,
                 'Missing the required parameter $xero_tenant_id when calling createFolder'
             );
         }
+        // verify the required parameter 'folder' is set
+        if ($folder === null || (is_array($folder) && count($folder) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $folder when calling createFolder'
+            );
+        }
         $resourcePath = '/Folders';
         $formParams = [];
         $queryParams = [];
@@ -3522,15 +3534,15 @@ protected function getInboxRequest($xero_tenant_id)
      * Update a file
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object file_object (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object file_object (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\File\FileObject
      */
-    public function updateFile($xero_tenant_id, $file_id, $idempotency_key = null, $file_object = null)
+    public function updateFile($xero_tenant_id, $file_id, $file_object, $idempotency_key = null)
     {
-        list($response) = $this->updateFileWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key, $file_object);
+        list($response) = $this->updateFileWithHttpInfo($xero_tenant_id, $file_id, $file_object, $idempotency_key);
         return $response;
     }
     /**
@@ -3538,15 +3550,15 @@ public function updateFile($xero_tenant_id, $file_id, $idempotency_key = null, $
      * Update a file
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\File\FileObject, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateFileWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key = null, $file_object = null)
+    public function updateFileWithHttpInfo($xero_tenant_id, $file_id, $file_object, $idempotency_key = null)
     {
-        $request = $this->updateFileRequest($xero_tenant_id, $file_id, $idempotency_key, $file_object);
+        $request = $this->updateFileRequest($xero_tenant_id, $file_id, $file_object, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -3617,14 +3629,14 @@ public function updateFileWithHttpInfo($xero_tenant_id, $file_id, $idempotency_k
      * Update a file
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateFileAsync($xero_tenant_id, $file_id, $idempotency_key = null, $file_object = null)
+    public function updateFileAsync($xero_tenant_id, $file_id, $file_object, $idempotency_key = null)
     {
-        return $this->updateFileAsyncWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key, $file_object)
+        return $this->updateFileAsyncWithHttpInfo($xero_tenant_id, $file_id, $file_object, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -3636,14 +3648,14 @@ function ($response) {
      * Update a file
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateFileAsyncWithHttpInfo($xero_tenant_id, $file_id, $idempotency_key = null, $file_object = null)
+    public function updateFileAsyncWithHttpInfo($xero_tenant_id, $file_id, $file_object, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\File\FileObject';
-        $request = $this->updateFileRequest($xero_tenant_id, $file_id, $idempotency_key, $file_object);
+        $request = $this->updateFileRequest($xero_tenant_id, $file_id, $file_object, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -3681,11 +3693,11 @@ function ($exception) {
      * Create request for operation 'updateFile'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $file_id File id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\File\FileObject $file_object (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateFileRequest($xero_tenant_id, $file_id, $idempotency_key = null, $file_object = null)
+    protected function updateFileRequest($xero_tenant_id, $file_id, $file_object, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -3699,6 +3711,12 @@ protected function updateFileRequest($xero_tenant_id, $file_id, $idempotency_key
                 'Missing the required parameter $file_id when calling updateFile'
             );
         }
+        // verify the required parameter 'file_object' is set
+        if ($file_object === null || (is_array($file_object) && count($file_object) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $file_object when calling updateFile'
+            );
+        }
         $resourcePath = '/Files/{FileId}';
         $formParams = [];
         $queryParams = [];
diff --git a/lib/Api/FinanceApi.php b/lib/Api/FinanceApi.php
index 6ab64736..7c640c68 100644
--- a/lib/Api/FinanceApi.php
+++ b/lib/Api/FinanceApi.php
@@ -14,7 +14,7 @@
  *
  * The Finance API is a collection of endpoints which customers can use in the course of a loan application, which may assist lenders to gain the confidence they need to provide capital.
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Api/IdentityApi.php b/lib/Api/IdentityApi.php
index 0f28fbc5..1a303b52 100644
--- a/lib/Api/IdentityApi.php
+++ b/lib/Api/IdentityApi.php
@@ -14,7 +14,7 @@
  *
  * These endpoints are related to managing authentication tokens and identity for Xero API
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Api/PayrollAuApi.php b/lib/Api/PayrollAuApi.php
index be24b14c..c01feaf9 100644
--- a/lib/Api/PayrollAuApi.php
+++ b/lib/Api/PayrollAuApi.php
@@ -14,7 +14,7 @@
  *
  * This is the Xero Payroll API for orgs in Australia region.
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
@@ -6980,15 +6980,15 @@ protected function rejectLeaveApplicationRequest($xero_tenant_id, $leave_applica
      * Updates an employee's detail
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $employee_id Employee id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee employee (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee employee (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\PayrollAu\Employees
      */
-    public function updateEmployee($xero_tenant_id, $employee_id, $idempotency_key = null, $employee = null)
+    public function updateEmployee($xero_tenant_id, $employee_id, $employee, $idempotency_key = null)
     {
-        list($response) = $this->updateEmployeeWithHttpInfo($xero_tenant_id, $employee_id, $idempotency_key, $employee);
+        list($response) = $this->updateEmployeeWithHttpInfo($xero_tenant_id, $employee_id, $employee, $idempotency_key);
         return $response;
     }
     /**
@@ -6996,15 +6996,15 @@ public function updateEmployee($xero_tenant_id, $employee_id, $idempotency_key =
      * Updates an employee's detail
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $employee_id Employee id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\PayrollAu\Employees, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateEmployeeWithHttpInfo($xero_tenant_id, $employee_id, $idempotency_key = null, $employee = null)
+    public function updateEmployeeWithHttpInfo($xero_tenant_id, $employee_id, $employee, $idempotency_key = null)
     {
-        $request = $this->updateEmployeeRequest($xero_tenant_id, $employee_id, $idempotency_key, $employee);
+        $request = $this->updateEmployeeRequest($xero_tenant_id, $employee_id, $employee, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -7075,14 +7075,14 @@ public function updateEmployeeWithHttpInfo($xero_tenant_id, $employee_id, $idemp
      * Updates an employee's detail
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $employee_id Employee id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateEmployeeAsync($xero_tenant_id, $employee_id, $idempotency_key = null, $employee = null)
+    public function updateEmployeeAsync($xero_tenant_id, $employee_id, $employee, $idempotency_key = null)
     {
-        return $this->updateEmployeeAsyncWithHttpInfo($xero_tenant_id, $employee_id, $idempotency_key, $employee)
+        return $this->updateEmployeeAsyncWithHttpInfo($xero_tenant_id, $employee_id, $employee, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -7094,14 +7094,14 @@ function ($response) {
      * Updates an employee's detail
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $employee_id Employee id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateEmployeeAsyncWithHttpInfo($xero_tenant_id, $employee_id, $idempotency_key = null, $employee = null)
+    public function updateEmployeeAsyncWithHttpInfo($xero_tenant_id, $employee_id, $employee, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\PayrollAu\Employees';
-        $request = $this->updateEmployeeRequest($xero_tenant_id, $employee_id, $idempotency_key, $employee);
+        $request = $this->updateEmployeeRequest($xero_tenant_id, $employee_id, $employee, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -7139,11 +7139,11 @@ function ($exception) {
      * Create request for operation 'updateEmployee'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $employee_id Employee id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Employee[] $employee (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateEmployeeRequest($xero_tenant_id, $employee_id, $idempotency_key = null, $employee = null)
+    protected function updateEmployeeRequest($xero_tenant_id, $employee_id, $employee, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -7157,6 +7157,12 @@ protected function updateEmployeeRequest($xero_tenant_id, $employee_id, $idempot
                 'Missing the required parameter $employee_id when calling updateEmployee'
             );
         }
+        // verify the required parameter 'employee' is set
+        if ($employee === null || (is_array($employee) && count($employee) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $employee when calling updateEmployee'
+            );
+        }
         $resourcePath = '/Employees/{EmployeeID}';
         $formParams = [];
         $queryParams = [];
@@ -7520,15 +7526,15 @@ protected function updateLeaveApplicationRequest($xero_tenant_id, $leave_applica
      * Updates a pay run
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $pay_run_id PayRun id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run pay_run (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run pay_run (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\PayrollAu\PayRuns
      */
-    public function updatePayRun($xero_tenant_id, $pay_run_id, $idempotency_key = null, $pay_run = null)
+    public function updatePayRun($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key = null)
     {
-        list($response) = $this->updatePayRunWithHttpInfo($xero_tenant_id, $pay_run_id, $idempotency_key, $pay_run);
+        list($response) = $this->updatePayRunWithHttpInfo($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key);
         return $response;
     }
     /**
@@ -7536,15 +7542,15 @@ public function updatePayRun($xero_tenant_id, $pay_run_id, $idempotency_key = nu
      * Updates a pay run
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $pay_run_id PayRun id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\PayrollAu\PayRuns, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updatePayRunWithHttpInfo($xero_tenant_id, $pay_run_id, $idempotency_key = null, $pay_run = null)
+    public function updatePayRunWithHttpInfo($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key = null)
     {
-        $request = $this->updatePayRunRequest($xero_tenant_id, $pay_run_id, $idempotency_key, $pay_run);
+        $request = $this->updatePayRunRequest($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -7615,14 +7621,14 @@ public function updatePayRunWithHttpInfo($xero_tenant_id, $pay_run_id, $idempote
      * Updates a pay run
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $pay_run_id PayRun id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updatePayRunAsync($xero_tenant_id, $pay_run_id, $idempotency_key = null, $pay_run = null)
+    public function updatePayRunAsync($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key = null)
     {
-        return $this->updatePayRunAsyncWithHttpInfo($xero_tenant_id, $pay_run_id, $idempotency_key, $pay_run)
+        return $this->updatePayRunAsyncWithHttpInfo($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -7634,14 +7640,14 @@ function ($response) {
      * Updates a pay run
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $pay_run_id PayRun id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updatePayRunAsyncWithHttpInfo($xero_tenant_id, $pay_run_id, $idempotency_key = null, $pay_run = null)
+    public function updatePayRunAsyncWithHttpInfo($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\PayrollAu\PayRuns';
-        $request = $this->updatePayRunRequest($xero_tenant_id, $pay_run_id, $idempotency_key, $pay_run);
+        $request = $this->updatePayRunRequest($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -7679,11 +7685,11 @@ function ($exception) {
      * Create request for operation 'updatePayRun'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $pay_run_id PayRun id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayRun[] $pay_run (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updatePayRunRequest($xero_tenant_id, $pay_run_id, $idempotency_key = null, $pay_run = null)
+    protected function updatePayRunRequest($xero_tenant_id, $pay_run_id, $pay_run, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -7697,6 +7703,12 @@ protected function updatePayRunRequest($xero_tenant_id, $pay_run_id, $idempotenc
                 'Missing the required parameter $pay_run_id when calling updatePayRun'
             );
         }
+        // verify the required parameter 'pay_run' is set
+        if ($pay_run === null || (is_array($pay_run) && count($pay_run) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $pay_run when calling updatePayRun'
+            );
+        }
         $resourcePath = '/PayRuns/{PayRunID}';
         $formParams = [];
         $queryParams = [];
@@ -7787,15 +7799,15 @@ protected function updatePayRunRequest($xero_tenant_id, $pay_run_id, $idempotenc
      * Updates a payslip
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $payslip_id Payslip id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines payslip_lines (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines payslip_lines (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\PayrollAu\Payslips
      */
-    public function updatePayslip($xero_tenant_id, $payslip_id, $idempotency_key = null, $payslip_lines = null)
+    public function updatePayslip($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key = null)
     {
-        list($response) = $this->updatePayslipWithHttpInfo($xero_tenant_id, $payslip_id, $idempotency_key, $payslip_lines);
+        list($response) = $this->updatePayslipWithHttpInfo($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key);
         return $response;
     }
     /**
@@ -7803,15 +7815,15 @@ public function updatePayslip($xero_tenant_id, $payslip_id, $idempotency_key = n
      * Updates a payslip
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $payslip_id Payslip id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\PayrollAu\Payslips, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updatePayslipWithHttpInfo($xero_tenant_id, $payslip_id, $idempotency_key = null, $payslip_lines = null)
+    public function updatePayslipWithHttpInfo($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key = null)
     {
-        $request = $this->updatePayslipRequest($xero_tenant_id, $payslip_id, $idempotency_key, $payslip_lines);
+        $request = $this->updatePayslipRequest($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -7882,14 +7894,14 @@ public function updatePayslipWithHttpInfo($xero_tenant_id, $payslip_id, $idempot
      * Updates a payslip
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $payslip_id Payslip id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updatePayslipAsync($xero_tenant_id, $payslip_id, $idempotency_key = null, $payslip_lines = null)
+    public function updatePayslipAsync($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key = null)
     {
-        return $this->updatePayslipAsyncWithHttpInfo($xero_tenant_id, $payslip_id, $idempotency_key, $payslip_lines)
+        return $this->updatePayslipAsyncWithHttpInfo($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -7901,14 +7913,14 @@ function ($response) {
      * Updates a payslip
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $payslip_id Payslip id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updatePayslipAsyncWithHttpInfo($xero_tenant_id, $payslip_id, $idempotency_key = null, $payslip_lines = null)
+    public function updatePayslipAsyncWithHttpInfo($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\PayrollAu\Payslips';
-        $request = $this->updatePayslipRequest($xero_tenant_id, $payslip_id, $idempotency_key, $payslip_lines);
+        $request = $this->updatePayslipRequest($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -7946,11 +7958,11 @@ function ($exception) {
      * Create request for operation 'updatePayslip'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $payslip_id Payslip id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\PayslipLines[] $payslip_lines (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updatePayslipRequest($xero_tenant_id, $payslip_id, $idempotency_key = null, $payslip_lines = null)
+    protected function updatePayslipRequest($xero_tenant_id, $payslip_id, $payslip_lines, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -7964,6 +7976,12 @@ protected function updatePayslipRequest($xero_tenant_id, $payslip_id, $idempoten
                 'Missing the required parameter $payslip_id when calling updatePayslip'
             );
         }
+        // verify the required parameter 'payslip_lines' is set
+        if ($payslip_lines === null || (is_array($payslip_lines) && count($payslip_lines) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $payslip_lines when calling updatePayslip'
+            );
+        }
         $resourcePath = '/Payslip/{PayslipID}';
         $formParams = [];
         $queryParams = [];
@@ -8054,15 +8072,15 @@ protected function updatePayslipRequest($xero_tenant_id, $payslip_id, $idempoten
      * Updates a superfund
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $super_fund_id Superfund id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund super_fund (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund super_fund (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\PayrollAu\SuperFunds
      */
-    public function updateSuperfund($xero_tenant_id, $super_fund_id, $idempotency_key = null, $super_fund = null)
+    public function updateSuperfund($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key = null)
     {
-        list($response) = $this->updateSuperfundWithHttpInfo($xero_tenant_id, $super_fund_id, $idempotency_key, $super_fund);
+        list($response) = $this->updateSuperfundWithHttpInfo($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key);
         return $response;
     }
     /**
@@ -8070,15 +8088,15 @@ public function updateSuperfund($xero_tenant_id, $super_fund_id, $idempotency_ke
      * Updates a superfund
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $super_fund_id Superfund id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\PayrollAu\SuperFunds, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateSuperfundWithHttpInfo($xero_tenant_id, $super_fund_id, $idempotency_key = null, $super_fund = null)
+    public function updateSuperfundWithHttpInfo($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key = null)
     {
-        $request = $this->updateSuperfundRequest($xero_tenant_id, $super_fund_id, $idempotency_key, $super_fund);
+        $request = $this->updateSuperfundRequest($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -8149,14 +8167,14 @@ public function updateSuperfundWithHttpInfo($xero_tenant_id, $super_fund_id, $id
      * Updates a superfund
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $super_fund_id Superfund id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateSuperfundAsync($xero_tenant_id, $super_fund_id, $idempotency_key = null, $super_fund = null)
+    public function updateSuperfundAsync($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key = null)
     {
-        return $this->updateSuperfundAsyncWithHttpInfo($xero_tenant_id, $super_fund_id, $idempotency_key, $super_fund)
+        return $this->updateSuperfundAsyncWithHttpInfo($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -8168,14 +8186,14 @@ function ($response) {
      * Updates a superfund
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $super_fund_id Superfund id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateSuperfundAsyncWithHttpInfo($xero_tenant_id, $super_fund_id, $idempotency_key = null, $super_fund = null)
+    public function updateSuperfundAsyncWithHttpInfo($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\PayrollAu\SuperFunds';
-        $request = $this->updateSuperfundRequest($xero_tenant_id, $super_fund_id, $idempotency_key, $super_fund);
+        $request = $this->updateSuperfundRequest($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -8213,11 +8231,11 @@ function ($exception) {
      * Create request for operation 'updateSuperfund'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $super_fund_id Superfund id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\SuperFund[] $super_fund (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateSuperfundRequest($xero_tenant_id, $super_fund_id, $idempotency_key = null, $super_fund = null)
+    protected function updateSuperfundRequest($xero_tenant_id, $super_fund_id, $super_fund, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -8231,6 +8249,12 @@ protected function updateSuperfundRequest($xero_tenant_id, $super_fund_id, $idem
                 'Missing the required parameter $super_fund_id when calling updateSuperfund'
             );
         }
+        // verify the required parameter 'super_fund' is set
+        if ($super_fund === null || (is_array($super_fund) && count($super_fund) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $super_fund when calling updateSuperfund'
+            );
+        }
         $resourcePath = '/Superfunds/{SuperFundID}';
         $formParams = [];
         $queryParams = [];
@@ -8321,15 +8345,15 @@ protected function updateSuperfundRequest($xero_tenant_id, $super_fund_id, $idem
      * Updates a timesheet
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $timesheet_id Timesheet id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet timesheet (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet timesheet (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return \XeroAPI\XeroPHP\Models\PayrollAu\Timesheets
      */
-    public function updateTimesheet($xero_tenant_id, $timesheet_id, $idempotency_key = null, $timesheet = null)
+    public function updateTimesheet($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key = null)
     {
-        list($response) = $this->updateTimesheetWithHttpInfo($xero_tenant_id, $timesheet_id, $idempotency_key, $timesheet);
+        list($response) = $this->updateTimesheetWithHttpInfo($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key);
         return $response;
     }
     /**
@@ -8337,15 +8361,15 @@ public function updateTimesheet($xero_tenant_id, $timesheet_id, $idempotency_key
      * Updates a timesheet
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $timesheet_id Timesheet id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (optional)
      * @throws \XeroAPI\XeroPHP\ApiException on non-2xx response
      * @throws \InvalidArgumentException
      * @return array of \XeroAPI\XeroPHP\Models\PayrollAu\Timesheets, HTTP status code, HTTP response headers (array of strings)
      */
-    public function updateTimesheetWithHttpInfo($xero_tenant_id, $timesheet_id, $idempotency_key = null, $timesheet = null)
+    public function updateTimesheetWithHttpInfo($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key = null)
     {
-        $request = $this->updateTimesheetRequest($xero_tenant_id, $timesheet_id, $idempotency_key, $timesheet);
+        $request = $this->updateTimesheetRequest($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key);
         try {
             $options = $this->createHttpClientOption();
             try {
@@ -8416,14 +8440,14 @@ public function updateTimesheetWithHttpInfo($xero_tenant_id, $timesheet_id, $ide
      * Updates a timesheet
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $timesheet_id Timesheet id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface
      */
-    public function updateTimesheetAsync($xero_tenant_id, $timesheet_id, $idempotency_key = null, $timesheet = null)
+    public function updateTimesheetAsync($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key = null)
     {
-        return $this->updateTimesheetAsyncWithHttpInfo($xero_tenant_id, $timesheet_id, $idempotency_key, $timesheet)
+        return $this->updateTimesheetAsyncWithHttpInfo($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key)
             ->then(
                 function ($response) {
                     return $response[0];
@@ -8435,14 +8459,14 @@ function ($response) {
      * Updates a timesheet
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $timesheet_id Timesheet id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Promise\PromiseInterface */
-    public function updateTimesheetAsyncWithHttpInfo($xero_tenant_id, $timesheet_id, $idempotency_key = null, $timesheet = null)
+    public function updateTimesheetAsyncWithHttpInfo($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key = null)
     {
         $returnType = '\XeroAPI\XeroPHP\Models\PayrollAu\Timesheets';
-        $request = $this->updateTimesheetRequest($xero_tenant_id, $timesheet_id, $idempotency_key, $timesheet);
+        $request = $this->updateTimesheetRequest($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key);
         return $this->client
             ->sendAsync($request, $this->createHttpClientOption())
             ->then(
@@ -8480,11 +8504,11 @@ function ($exception) {
      * Create request for operation 'updateTimesheet'
      * @param  string $xero_tenant_id Xero identifier for Tenant (required)
      * @param  string $timesheet_id Timesheet id for single object (required)
+     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (required)
      * @param  string $idempotency_key This allows you to safely retry requests without the risk of duplicate processing. 128 character max. (optional)
-     * @param  \XeroAPI\XeroPHP\Models\PayrollAu\Timesheet[] $timesheet (optional)
      * @throws \InvalidArgumentException
      * @return \GuzzleHttp\Psr7\Request  */
-    protected function updateTimesheetRequest($xero_tenant_id, $timesheet_id, $idempotency_key = null, $timesheet = null)
+    protected function updateTimesheetRequest($xero_tenant_id, $timesheet_id, $timesheet, $idempotency_key = null)
     {
         // verify the required parameter 'xero_tenant_id' is set
         if ($xero_tenant_id === null || (is_array($xero_tenant_id) && count($xero_tenant_id) === 0)) {
@@ -8498,6 +8522,12 @@ protected function updateTimesheetRequest($xero_tenant_id, $timesheet_id, $idemp
                 'Missing the required parameter $timesheet_id when calling updateTimesheet'
             );
         }
+        // verify the required parameter 'timesheet' is set
+        if ($timesheet === null || (is_array($timesheet) && count($timesheet) === 0)) {
+            throw new \InvalidArgumentException(
+                'Missing the required parameter $timesheet when calling updateTimesheet'
+            );
+        }
         $resourcePath = '/Timesheets/{TimesheetID}';
         $formParams = [];
         $queryParams = [];
diff --git a/lib/Api/PayrollNzApi.php b/lib/Api/PayrollNzApi.php
index c0195c32..ea4d1922 100644
--- a/lib/Api/PayrollNzApi.php
+++ b/lib/Api/PayrollNzApi.php
@@ -14,7 +14,7 @@
  *
  * This is the Xero Payroll API for orgs in the NZ region.
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Api/PayrollUkApi.php b/lib/Api/PayrollUkApi.php
index 462976fe..d4a8db2c 100644
--- a/lib/Api/PayrollUkApi.php
+++ b/lib/Api/PayrollUkApi.php
@@ -14,7 +14,7 @@
  *
  * This is the Xero Payroll API for orgs in the UK region.
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Api/ProjectApi.php b/lib/Api/ProjectApi.php
index b8623fb6..d9ae4b6c 100644
--- a/lib/Api/ProjectApi.php
+++ b/lib/Api/ProjectApi.php
@@ -14,7 +14,7 @@
  *
  * This is the Xero Projects API
  *
- * OpenAPI spec version: 2.40.3
+ * OpenAPI spec version: 3.0.0
  * Contact: api@xero.com
  * Generated by: https://openapi-generator.tech
  * OpenAPI Generator version: 5.4.0
diff --git a/lib/Configuration.php b/lib/Configuration.php
index 98964e44..4b8ea7c2 100644
--- a/lib/Configuration.php
+++ b/lib/Configuration.php
@@ -157,7 +157,7 @@ class Configuration
      *
      * @var string
      */
-    protected $userAgent = '[xero-php-oauth2 (2.23.3)]';
+    protected $userAgent = '[xero-php-oauth2 (3.0.0)]';
 
     /**
      * Debug switch (default set to false)
@@ -696,8 +696,8 @@ public static function toDebugReport()
         $report  = 'PHP SDK (XeroAPI\XeroPHP) Debug Report:' . PHP_EOL;
         $report .= '    OS: ' . php_uname() . PHP_EOL;
         $report .= '    PHP Version: ' . PHP_VERSION . PHP_EOL;
-        $report .= '    OpenAPI Spec Version: 2.40.3' . PHP_EOL;
-        $report .= '    SDK Package Version: 2.23.3' . PHP_EOL;
+        $report .= '    OpenAPI Spec Version: 3.0.0' . PHP_EOL;
+        $report .= '    SDK Package Version: 3.0.0' . PHP_EOL;
         $report .= '    Temp Folder Path: ' . self::getDefaultConfiguration()->getTempFolderPath() . PHP_EOL;
 
         return $report;