diff --git a/OPENAPI_VERSION b/OPENAPI_VERSION
index 1f7b99f730..e02bb288e4 100644
--- a/OPENAPI_VERSION
+++ b/OPENAPI_VERSION
@@ -1 +1 @@
-v163
\ No newline at end of file
+v164
\ No newline at end of file
diff --git a/types/2020-08-27/Checkout/Sessions.d.ts b/types/2020-08-27/Checkout/Sessions.d.ts
index fedb4b03b7..2c7e7fc4ae 100644
--- a/types/2020-08-27/Checkout/Sessions.d.ts
+++ b/types/2020-08-27/Checkout/Sessions.d.ts
@@ -2942,6 +2942,11 @@ declare module 'stripe' {
          */
         customer?: string;
 
+        /**
+         * Only return the Checkout Sessions for the Customer details specified.
+         */
+        customer_details?: SessionListParams.CustomerDetails;
+
         /**
          * Specifies which fields in the response should be expanded.
          */
@@ -2958,6 +2963,15 @@ declare module 'stripe' {
         subscription?: string;
       }
 
+      namespace SessionListParams {
+        interface CustomerDetails {
+          /**
+           * Customer's email address.
+           */
+          email: string;
+        }
+      }
+
       interface SessionExpireParams {
         /**
          * Specifies which fields in the response should be expanded.
diff --git a/types/2020-08-27/LineItems.d.ts b/types/2020-08-27/LineItems.d.ts
index 6f41fb08c0..68a3897b28 100644
--- a/types/2020-08-27/LineItems.d.ts
+++ b/types/2020-08-27/LineItems.d.ts
@@ -19,7 +19,7 @@ declare module 'stripe' {
       /**
        * Total discount amount applied. If no discounts were applied, defaults to 0.
        */
-      amount_discount?: number;
+      amount_discount: number;
 
       /**
        * Total before any discounts or taxes are applied.
@@ -29,7 +29,7 @@ declare module 'stripe' {
       /**
        * Total tax amount applied. If no tax was applied, defaults to 0.
        */
-      amount_tax?: number;
+      amount_tax: number;
 
       /**
        * Total after discounts and taxes.
diff --git a/types/2020-08-27/TestHelpers/Terminal/Readers.d.ts b/types/2020-08-27/TestHelpers/Terminal/Readers.d.ts
index 1f46c752b7..dc76395376 100644
--- a/types/2020-08-27/TestHelpers/Terminal/Readers.d.ts
+++ b/types/2020-08-27/TestHelpers/Terminal/Readers.d.ts
@@ -6,7 +6,7 @@ declare module 'stripe' {
       namespace Terminal {
         interface ReaderPresentPaymentMethodParams {
           /**
-           * Simulated card present data
+           * Simulated data for the card_present payment method
            */
           card_present?: ReaderPresentPaymentMethodParams.CardPresent;
 
diff --git a/types/2020-08-27/Transfers.d.ts b/types/2020-08-27/Transfers.d.ts
index 67d52d7657..11a11cd0ff 100644
--- a/types/2020-08-27/Transfers.d.ts
+++ b/types/2020-08-27/Transfers.d.ts
@@ -84,7 +84,7 @@ declare module 'stripe' {
       /**
        * The source balance this transfer came from. One of `card`, `fpx`, or `bank_account`.
        */
-      source_type: string | null;
+      source_type?: string;
 
       /**
        * A string that identifies this transaction as part of a group. See the [Connect documentation](https://stripe.com/docs/connect/charges-transfers#transfer-options) for details.