SKPayments Complete transaction called two times

I got serious problem i am working on In app purchase and when i try to purchase first time it works fine and for the second time my completeTransaction called two times.. I dont know why i got this issue. After i got receipt i call my verification method and if verify Okay than server send me audio file in http responce and i downlaod that and when i successfully download file i call finishtransaction. Here is my code ``` - (void)startPurchase { [[SKPaymentQueue defaultQueue] addTransactionObserver:self]; if([SKPaymentQueue canMakePayments]) { NSLog(@"IN-APP:can make payments"); SKProductsRequest *request = [[SKProductsRequest alloc] initWithProductIdentifiers: [NSSet setWithObject:myIdentifier]]; request.delegate = self; NSLog(@"** Productdata is ** %@",myIdentifier); [request start]; } else { NSLog(@"IN-APP:can't make payments"); loadingHUD.hidden=YES; } } - (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response { NSLog(@"IN productsRequest END %d",[response.products count]); @try { SKProduct *product = [response.products objectAtIndex:0]; SKPayment *newPayment = [SKPayment paymentWithProduct:product]; [[SKPaymentQueue defaultQueue] addPayment:newPayment]; NSLog(@"IN-APP:productsRequest END"); loadingHUD.hidden=YES; // Hide the Loading progress bar } @catch (NSException *exception) { // Failed to purchase Hide the progress bar and Display Error Dialog loadingHUD.hidden=YES; UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"error" message:@"Errror " delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alertView show]; } } - (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions { for (SKPaymentTransaction *transaction in transactions) { switch (transaction.transactionState) { case SKPaymentTransactionStatePurchased: [self completeTransaction:transaction]; break; case SKPaymentTransactionStateFailed: [self failedTransaction:transaction]; break; case SKPaymentTransactionStateRestored: [self restoreTransaction:transaction]; default: break; } } } - (void) completeTransaction: (SKPaymentTransaction *)transaction { NSLog(@"Transaction Completed"); // Finally, remove the transaction from the payment queue. [self verifyReceipt:transaction]; // Call the verifyReceipt method to send transaction.bytes // [[SKPaymentQueue defaultQueue] finishTransaction: transaction]; NSLog(@"Purchase Transaction finish"); } ``` In VerifyTransaction method in download success block i call finish transaction ``` [operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) { [[SKPaymentQueue defaultQueue] finishTransaction: transaction]; // Finish the transaction // NSLog(@"Successfully downloaded file to %@",[[NSString alloc] initWithData:operation.responseData encoding:NSASCIIStringEncoding]); // Give alert that downloading successful. NSLog(@"Successfully downloaded file to %@", destPath); // NSLog(@"response: %@", operation.responseString); // Give alert that downloading successful. // [self.target parserDidDownloadItem:destPath]; //loadingHUD.detailsLabelText = [NSString stringWithFormat:@"%@ %i%%",@"Downloading",100]; [loadingHUD hide:TRUE]; [DBHelper savePurchaseId:fileName]; // save the purchase itune id into local database to populate hover image of play button on main List [self movieReceived]; } ```