diff --git a/embedded/openapi/spec3.beta.sdk.json b/embedded/openapi/spec3.beta.sdk.json
index 17821209..08a3c2f7 100644
--- a/embedded/openapi/spec3.beta.sdk.json
+++ b/embedded/openapi/spec3.beta.sdk.json
@@ -45033,6 +45033,12 @@
       "payment_pages_checkout_session_custom_fields_dropdown": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "options": {
             "description": "The options available for the customer to select. Up to 200 options allowed.",
             "items": {
@@ -45048,6 +45054,7 @@
           }
         },
         "required": [
+          "default_value",
           "options",
           "value"
         ],
@@ -45089,6 +45096,12 @@
       "payment_pages_checkout_session_custom_fields_numeric": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill the field on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "maximum_length": {
             "description": "The maximum character length constraint for the customer's input.",
             "nullable": true,
@@ -45107,6 +45120,7 @@
           }
         },
         "required": [
+          "default_value",
           "maximum_length",
           "minimum_length",
           "value"
@@ -45148,6 +45162,12 @@
       "payment_pages_checkout_session_custom_fields_text": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill the field on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "maximum_length": {
             "description": "The maximum character length constraint for the customer's input.",
             "nullable": true,
@@ -45166,6 +45186,7 @@
           }
         },
         "required": [
+          "default_value",
           "maximum_length",
           "minimum_length",
           "value"
@@ -87787,6 +87808,11 @@
                         "dropdown": {
                           "description": "Configuration for `type=dropdown` fields.",
                           "properties": {
+                            "default_value": {
+                              "description": "The value that will pre-fill the field on the payment page.Must match a `value` in the `options` array.",
+                              "maxLength": 100,
+                              "type": "string"
+                            },
                             "options": {
                               "description": "The options available for the customer to select. Up to 200 options allowed.",
                               "items": {
@@ -87849,6 +87875,11 @@
                         "numeric": {
                           "description": "Configuration for `type=numeric` fields.",
                           "properties": {
+                            "default_value": {
+                              "description": "The value that will pre-fill the field on the payment page.",
+                              "maxLength": 255,
+                              "type": "string"
+                            },
                             "maximum_length": {
                               "description": "The maximum character length constraint for the customer's input.",
                               "type": "integer"
@@ -87868,6 +87899,11 @@
                         "text": {
                           "description": "Configuration for `type=text` fields.",
                           "properties": {
+                            "default_value": {
+                              "description": "The value that will pre-fill the field on the payment page.",
+                              "maxLength": 255,
+                              "type": "string"
+                            },
                             "maximum_length": {
                               "description": "The maximum character length constraint for the customer's input.",
                               "type": "integer"
diff --git a/embedded/openapi/spec3.json b/embedded/openapi/spec3.json
index fa41742d..5cceec09 100644
--- a/embedded/openapi/spec3.json
+++ b/embedded/openapi/spec3.json
@@ -32327,6 +32327,12 @@
       "payment_pages_checkout_session_custom_fields_dropdown": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "options": {
             "description": "The options available for the customer to select. Up to 200 options allowed.",
             "items": {
@@ -32377,6 +32383,12 @@
       "payment_pages_checkout_session_custom_fields_numeric": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill the field on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "maximum_length": {
             "description": "The maximum character length constraint for the customer's input.",
             "nullable": true,
@@ -32423,6 +32435,12 @@
       "payment_pages_checkout_session_custom_fields_text": {
         "description": "",
         "properties": {
+          "default_value": {
+            "description": "The value that will pre-fill the field on the payment page.",
+            "maxLength": 5000,
+            "nullable": true,
+            "type": "string"
+          },
           "maximum_length": {
             "description": "The maximum character length constraint for the customer's input.",
             "nullable": true,
@@ -64786,6 +64804,10 @@
                       "properties": {
                         "dropdown": {
                           "properties": {
+                            "default_value": {
+                              "maxLength": 100,
+                              "type": "string"
+                            },
                             "options": {
                               "items": {
                                 "properties": {
@@ -64840,6 +64862,10 @@
                         },
                         "numeric": {
                           "properties": {
+                            "default_value": {
+                              "maxLength": 255,
+                              "type": "string"
+                            },
                             "maximum_length": {
                               "type": "integer"
                             },
@@ -64855,6 +64881,10 @@
                         },
                         "text": {
                           "properties": {
+                            "default_value": {
+                              "maxLength": 255,
+                              "type": "string"
+                            },
                             "maximum_length": {
                               "type": "integer"
                             },