Add JWS representation support to unfinishedTransactions

Previously returned nil for receipt data, now properly includes
jwsRepresentation for server-side verification.

Author: Haidar0096

packages/in_app_purchase/in_app_purchase_storekit/darwin/in_app_purchase_storekit/Sources/in_app_purchase_storekit/StoreKit2/InAppPurchasePlugin+StoreKit2.swift

@@ -238,8 +238,16 @@ extension InAppPurchasePlugin: InAppPurchase2API {
     Task {
       @MainActor in
       do {
-        let transactionsMsgs = await rawUnfinishedTransactions().map {
-          $0.convertToPigeon(receipt: nil)
+        var transactionsMsgs: [SK2TransactionMessage] = []
+        for await verificationResult in Transaction.unfinished {
+          switch verificationResult {
+          case .verified(let transaction):
+            transactionsMsgs.append(
+              transaction.convertToPigeon(receipt: verificationResult.jwsRepresentation)
+            )
+          case .unverified:
+            break
+          }
         }
         completion(.success(transactionsMsgs))
       }
@@ -378,20 +386,6 @@ extension InAppPurchasePlugin: InAppPurchase2API {
     return transactions
   }
 
-  /// Helper function that fetches and unwraps all verified unfinished transactions
-  func rawUnfinishedTransactions() async -> [Transaction] {
-    var transactions: [Transaction] = []
-    for await verificationResult in Transaction.unfinished {
-      switch verificationResult {
-      case .verified(let transaction):
-        transactions.append(transaction)
-      case .unverified:
-        break
-      }
-    }
-    return transactions
-  }
-
   /// Helper function to fetch specific transaction
   func fetchTransaction(by id: UInt64) async throws -> Transaction? {
     for await result in Transaction.all {

packages/in_app_purchase/in_app_purchase_storekit/lib/src/store_kit_2_wrappers/sk2_transaction_wrapper.dart

@@ -27,6 +27,7 @@ class SK2Transaction {
     this.subscriptionGroupID,
     this.price,
     this.error,
+    this.receiptData,
     this.jsonRepresentation,
   });
 
@@ -63,7 +64,11 @@ class SK2Transaction {
   /// Any error returned from StoreKit
   final SKError? error;
 
-  /// The json representation of a transaction
+  /// The JWS (JSON Web Signature) representation of the transaction.
+  /// This is the jwsRepresentation from StoreKit used for server-side verification.
+  final String? receiptData;
+
+  /// The json representation of a transaction.
   final String? jsonRepresentation;
 
   /// Wrapper around [Transaction.finish]
@@ -122,6 +127,7 @@ extension on SK2TransactionMessage {
       purchaseDate: purchaseDate,
       expirationDate: expirationDate,
       appAccountToken: appAccountToken,
+      receiptData: receiptData,
       jsonRepresentation: jsonRepresentation,
     );
   }

packages/in_app_purchase/in_app_purchase_storekit/test/fakes/fake_storekit_platform.dart

@@ -458,6 +458,7 @@ class FakeStoreKit2Platform implements InAppPurchase2API {
         originalId: 123,
         productId: 'product_id',
         purchaseDate: '12-12',
+        receiptData: 'fake_jws_representation',
       ),
     ]);
   }

packages/in_app_purchase/in_app_purchase_storekit/test/in_app_purchase_storekit_2_platform_test.dart

@@ -675,6 +675,15 @@ void main() {
       expect(transactions.first.id, '123');
       expect(transactions.first.productId, 'product_id');
     });
+
+    test('should expose receiptData (JWS) in unfinished transactions', () async {
+      final List<SK2Transaction> transactions =
+          await SK2Transaction.unfinishedTransactions();
+
+      expect(transactions, isNotEmpty);
+      expect(transactions.first.receiptData, isNotNull);
+      expect(transactions.first.receiptData, 'fake_jws_representation');
+    });
   });
 
   group('appAccountToken exposure', () {
@@ -707,7 +716,6 @@ void main() {
         ),
         transactionDate: '2025-11-15',
         status: PurchaseStatus.purchased,
-        appAccountToken: null,
       );
 
       expect(details.appAccountToken, isNull);