diff --git a/packages/stripe_platform_interface/lib/src/models/errors.dart b/packages/stripe_platform_interface/lib/src/models/errors.dart
index 31be863a3..1278c5b62 100644
--- a/packages/stripe_platform_interface/lib/src/models/errors.dart
+++ b/packages/stripe_platform_interface/lib/src/models/errors.dart
@@ -51,6 +51,7 @@ class LocalizedErrorMessage with _$LocalizedErrorMessage {
   @JsonSerializable(explicitToJson: true)
   const factory LocalizedErrorMessage({
     /// The error code for example Cancelled
+    @JsonKey(unknownEnumValue: FailureCode.Unknown)
     required FailureCode code,
 
     /// Localized error message if any
@@ -73,7 +74,7 @@ class LocalizedErrorMessage with _$LocalizedErrorMessage {
       _$LocalizedErrorMessageFromJson(json);
 }
 
-enum FailureCode { Failed, Canceled, Timeout }
+enum FailureCode { Failed, Canceled, Timeout, Unknown }
 
 class StripeConfigException implements Exception {
   const StripeConfigException(this.message);
diff --git a/packages/stripe_platform_interface/lib/src/models/errors.freezed.dart b/packages/stripe_platform_interface/lib/src/models/errors.freezed.dart
index c2d661e97..8be8457dc 100644
--- a/packages/stripe_platform_interface/lib/src/models/errors.freezed.dart
+++ b/packages/stripe_platform_interface/lib/src/models/errors.freezed.dart
@@ -346,6 +346,7 @@ LocalizedErrorMessage _$LocalizedErrorMessageFromJson(
 /// @nodoc
 mixin _$LocalizedErrorMessage {
   /// The error code for example Cancelled
+  @JsonKey(unknownEnumValue: FailureCode.Unknown)
   FailureCode get code => throw _privateConstructorUsedError;
 
   /// Localized error message if any
@@ -376,7 +377,7 @@ abstract class $LocalizedErrorMessageCopyWith<$Res> {
       _$LocalizedErrorMessageCopyWithImpl<$Res, LocalizedErrorMessage>;
   @useResult
   $Res call(
-      {FailureCode code,
+      {@JsonKey(unknownEnumValue: FailureCode.Unknown) FailureCode code,
       String? localizedMessage,
       String? message,
       String? stripeErrorCode,
@@ -444,7 +445,7 @@ abstract class _$$LocalizedErrorMessageImplCopyWith<$Res>
   @override
   @useResult
   $Res call(
-      {FailureCode code,
+      {@JsonKey(unknownEnumValue: FailureCode.Unknown) FailureCode code,
       String? localizedMessage,
       String? message,
       String? stripeErrorCode,
@@ -505,7 +506,7 @@ class __$$LocalizedErrorMessageImplCopyWithImpl<$Res>
 @JsonSerializable(explicitToJson: true)
 class _$LocalizedErrorMessageImpl implements _LocalizedErrorMessage {
   const _$LocalizedErrorMessageImpl(
-      {required this.code,
+      {@JsonKey(unknownEnumValue: FailureCode.Unknown) required this.code,
       this.localizedMessage,
       this.message,
       this.stripeErrorCode,
@@ -517,6 +518,7 @@ class _$LocalizedErrorMessageImpl implements _LocalizedErrorMessage {
 
   /// The error code for example Cancelled
   @override
+  @JsonKey(unknownEnumValue: FailureCode.Unknown)
   final FailureCode code;
 
   /// Localized error message if any
@@ -582,7 +584,8 @@ class _$LocalizedErrorMessageImpl implements _LocalizedErrorMessage {
 
 abstract class _LocalizedErrorMessage implements LocalizedErrorMessage {
   const factory _LocalizedErrorMessage(
-      {required final FailureCode code,
+      {@JsonKey(unknownEnumValue: FailureCode.Unknown)
+      required final FailureCode code,
       final String? localizedMessage,
       final String? message,
       final String? stripeErrorCode,
@@ -595,6 +598,7 @@ abstract class _LocalizedErrorMessage implements LocalizedErrorMessage {
   @override
 
   /// The error code for example Cancelled
+  @JsonKey(unknownEnumValue: FailureCode.Unknown)
   FailureCode get code;
   @override
 
diff --git a/packages/stripe_platform_interface/lib/src/models/errors.g.dart b/packages/stripe_platform_interface/lib/src/models/errors.g.dart
index d8ca7f544..c9ad22a31 100644
--- a/packages/stripe_platform_interface/lib/src/models/errors.g.dart
+++ b/packages/stripe_platform_interface/lib/src/models/errors.g.dart
@@ -36,7 +36,8 @@ Map<String, dynamic> _$$StripeExceptionImplToJson(
 _$LocalizedErrorMessageImpl _$$LocalizedErrorMessageImplFromJson(
         Map<String, dynamic> json) =>
     _$LocalizedErrorMessageImpl(
-      code: $enumDecode(_$FailureCodeEnumMap, json['code']),
+      code: $enumDecode(_$FailureCodeEnumMap, json['code'],
+          unknownValue: FailureCode.Unknown),
       localizedMessage: json['localizedMessage'] as String?,
       message: json['message'] as String?,
       stripeErrorCode: json['stripeErrorCode'] as String?,
@@ -59,4 +60,5 @@ const _$FailureCodeEnumMap = {
   FailureCode.Failed: 'Failed',
   FailureCode.Canceled: 'Canceled',
   FailureCode.Timeout: 'Timeout',
+  FailureCode.Unknown: 'Unknown',
 };