diff --git a/packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_wrappers/sk_payment_queue_wrapper.dart b/packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_wrappers/sk_payment_queue_wrapper.dart
index 927815d104c7..ab0ccf88d9c3 100644
--- a/packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_wrappers/sk_payment_queue_wrapper.dart
+++ b/packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_wrappers/sk_payment_queue_wrapper.dart
@@ -539,13 +539,7 @@ class SKPaymentDiscountWrapper {
 
   /// Creates a Map object describes the payment object.
   Map<String, dynamic> toMap() {
-    return <String, dynamic>{
-      'identifier': identifier,
-      'keyIdentifier': keyIdentifier,
-      'nonce': nonce,
-      'signature': signature,
-      'timestamp': timestamp,
-    };
+    return _$SKPaymentDiscountWrapperToJson(this);
   }
 
   /// The identifier of the discount offer.