diff --git a/RMStore/RMStore.h b/RMStore/RMStore.h
index 1a7a6622..748b675c 100755
--- a/RMStore/RMStore.h
+++ b/RMStore/RMStore.h
@@ -31,6 +31,8 @@ extern NSInteger const RMStoreErrorCodeDownloadCanceled;
 extern NSInteger const RMStoreErrorCodeUnknownProductIdentifier;
 extern NSInteger const RMStoreErrorCodeUnableToCompleteVerification;
 
+extern NSString *const RMStoreNotificationExtraUserInfo;
+
 /** A StoreKit wrapper that adds blocks and notifications, plus optional receipt verification and purchase management.
  */
 @interface RMStore : NSObject<SKPaymentTransactionObserver>
@@ -217,7 +219,7 @@ extern NSInteger const RMStoreErrorCodeUnableToCompleteVerification;
  @param failureBlock Called if the transaction failed verification. If verification could not be completed (e.g., due to connection issues), then error must be of code RMStoreErrorCodeUnableToCompleteVerification to prevent RMStore to finish the transaction. Must be called in the main queu.
  */
 - (void)verifyTransaction:(SKPaymentTransaction*)transaction
-                  success:(void (^)())successBlock
+                  success:(void (^)(id successData))successBlock
                   failure:(void (^)(NSError *error))failureBlock;
 
 @end
diff --git a/RMStore/RMStore.m b/RMStore/RMStore.m
index ece43bd9..f37e147a 100755
--- a/RMStore/RMStore.m
+++ b/RMStore/RMStore.m
@@ -50,6 +50,8 @@
 NSString* const RMStoreNotificationTransaction = @"transaction";
 NSString* const RMStoreNotificationTransactions = @"transactions";
 
+NSString* const RMStoreNotificationExtraUserInfo = @"extraData";
+
 #if DEBUG
 #define RMStoreLog(...) NSLog(@"RMStore: %@", [NSString stringWithFormat:__VA_ARGS__]);
 #else
@@ -199,18 +201,24 @@ - (void)addPayment:(NSString*)productIdentifier
            success:(void (^)(SKPaymentTransaction *transaction))successBlock
            failure:(void (^)(SKPaymentTransaction *transaction, NSError *error))failureBlock
 {
+    SKMutablePayment *payment = nil;
     SKProduct *product = [self productForIdentifier:productIdentifier];
     if (product == nil)
     {
-        RMStoreLog(@"unknown product id %@", productIdentifier)
-        if (failureBlock != nil)
-        {
-            NSError *error = [NSError errorWithDomain:RMStoreErrorDomain code:RMStoreErrorCodeUnknownProductIdentifier userInfo:@{NSLocalizedDescriptionKey: NSLocalizedStringFromTable(@"Unknown product identifier", @"RMStore", @"Error description")}];
-            failureBlock(nil, error);
+        payment = [SKMutablePayment paymentWithProductIdentifier:productIdentifier];
+        if (payment == nil) {
+            RMStoreLog(@"unknown product id %@", productIdentifier)
+            if (failureBlock != nil)
+            {
+                NSError *error = [NSError errorWithDomain:RMStoreErrorDomain code:RMStoreErrorCodeUnknownProductIdentifier userInfo:@{NSLocalizedDescriptionKey: NSLocalizedStringFromTable(@"Unknown product identifier", @"RMStore", @"Error description")}];
+                failureBlock(nil, error);
+            }
+            return;
         }
-        return;
+    } else {
+        payment = [SKMutablePayment paymentWithProduct:product];
     }
-    SKMutablePayment *payment = [SKMutablePayment paymentWithProduct:product];
+    
     if ([payment respondsToSelector:@selector(setApplicationUsername:)])
     {
         payment.applicationUsername = userIdentifier;
@@ -484,7 +492,7 @@ - (void)didFinishDownload:(SKDownload*)download queue:(SKPaymentQueue*)queue
     const BOOL hasPendingDownloads = [self.class hasPendingDownloadsInTransaction:transaction];
     if (!hasPendingDownloads)
     {
-        [self finishTransaction:download.transaction queue:queue];
+        [self finishTransaction:download.transaction queue:queue extraData:nil];
     }
 }
 
@@ -528,8 +536,8 @@ - (void)didPurchaseTransaction:(SKPaymentTransaction *)transaction queue:(SKPaym
     
     if (self.receiptVerifier != nil)
     {
-        [self.receiptVerifier verifyTransaction:transaction success:^{
-            [self didVerifyTransaction:transaction queue:queue];
+        [self.receiptVerifier verifyTransaction:transaction success:^(id successData){
+            [self didVerifyTransaction:transaction queue:queue extraData:successData];
         } failure:^(NSError *error) {
             [self didFailTransaction:transaction queue:queue error:error];
         }];
@@ -537,7 +545,7 @@ - (void)didPurchaseTransaction:(SKPaymentTransaction *)transaction queue:(SKPaym
     else
     {
         RMStoreLog(@"WARNING: no receipt verification");
-        [self didVerifyTransaction:transaction queue:queue];
+        [self didVerifyTransaction:transaction queue:queue extraData:nil];
     }
 }
 
@@ -574,8 +582,8 @@ - (void)didRestoreTransaction:(SKPaymentTransaction *)transaction queue:(SKPayme
     _pendingRestoredTransactionsCount++;
     if (self.receiptVerifier != nil)
     {
-        [self.receiptVerifier verifyTransaction:transaction success:^{
-            [self didVerifyTransaction:transaction queue:queue];
+        [self.receiptVerifier verifyTransaction:transaction success:^(id successData){
+            [self didVerifyTransaction:transaction queue:queue extraData:successData];
         } failure:^(NSError *error) {
             [self didFailTransaction:transaction queue:queue error:error];
         }];
@@ -583,7 +591,7 @@ - (void)didRestoreTransaction:(SKPaymentTransaction *)transaction queue:(SKPayme
     else
     {
         RMStoreLog(@"WARNING: no receipt verification");
-        [self didVerifyTransaction:transaction queue:queue];
+        [self didVerifyTransaction:transaction queue:queue extraData:nil];
     }
 }
 
@@ -592,13 +600,13 @@ - (void)didDeferTransaction:(SKPaymentTransaction *)transaction
     [self postNotificationWithName:RMSKPaymentTransactionDeferred transaction:transaction userInfoExtras:nil];
 }
 
-- (void)didVerifyTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue
+- (void)didVerifyTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue extraData:(id)extraData
 {
     if (self.contentDownloader != nil)
     {
         [self.contentDownloader downloadContentForTransaction:transaction success:^{
             [self postNotificationWithName:RMSKDownloadFinished transaction:transaction userInfoExtras:nil];
-            [self didDownloadSelfHostedContentForTransaction:transaction queue:queue];
+            [self didDownloadSelfHostedContentForTransaction:transaction queue:queue extraData:extraData];
         } progress:^(float progress) {
             NSDictionary *extras = @{RMStoreNotificationDownloadProgress : @(progress)};
             [self postNotificationWithName:RMSKDownloadUpdated transaction:transaction userInfoExtras:extras];
@@ -610,11 +618,11 @@ - (void)didVerifyTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymen
     }
     else
     {
-        [self didDownloadSelfHostedContentForTransaction:transaction queue:queue];
+        [self didDownloadSelfHostedContentForTransaction:transaction queue:queue extraData:extraData];
     }
 }
 
-- (void)didDownloadSelfHostedContentForTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue
+- (void)didDownloadSelfHostedContentForTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue extraData:(id)extraData
 {
     NSArray *downloads = [transaction respondsToSelector:@selector(downloads)] ? transaction.downloads : @[];
     if (downloads.count > 0)
@@ -624,11 +632,11 @@ - (void)didDownloadSelfHostedContentForTransaction:(SKPaymentTransaction *)trans
     }
     else
     {
-        [self finishTransaction:transaction queue:queue];
+        [self finishTransaction:transaction queue:queue extraData:extraData];
     }
 }
 
-- (void)finishTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue
+- (void)finishTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQueue*)queue extraData:(id)extraData
 {
     SKPayment *payment = transaction.payment;
 	NSString* productIdentifier = payment.productIdentifier;
@@ -641,7 +649,12 @@ - (void)finishTransaction:(SKPaymentTransaction *)transaction queue:(SKPaymentQu
         wrapper.successBlock(transaction);
     }
     
-    [self postNotificationWithName:RMSKPaymentTransactionFinished transaction:transaction userInfoExtras:nil];
+    NSDictionary *extraInfo = nil;
+    if (extraData) {
+        extraInfo = @{RMStoreNotificationExtraUserInfo:extraData};
+    }
+    
+    [self postNotificationWithName:RMSKPaymentTransactionFinished transaction:transaction userInfoExtras:extraInfo];
     
     if (transaction.transactionState == SKPaymentTransactionStateRestored)
     {