No iOS 7, noSKPaymentTransaction classe, a propriedadetransactionReceipt:

// Only valid if state is SKPaymentTransactionStatePurchased.

 @property(nonatomic, readonly) NSData *transactionReceipt

…édescontinuada. Mas, no meu código, eu criei uma classe InAppPurchase, e no meu método para controlar como é o método de compra, estou usando o método delegate no meu código e é como:

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions {

for (SKPaymentTransaction *transaction in transactions) {

    switch (transaction.transactionState) {

        case SKPaymentTransactionStatePurchasing:

                       // code and bla bla bla    
                          [self initPurchase];  
                          NSLog(@"PASO 1");          

            break;

        case SKPaymentTransactionStatePurchased:

                      // this is successfully purchased!
                            purchased = TRUE;
                            NSLog(@"PASO 2");
                           [self isPurchased];

                 NSLog(@"purchased %s", purchased? "true" : "false");

                     //  and return the transaction data

  if ([delegate respondsToSelector:@selector(successfulPurchase:restored:identifier:receipt:)])
  [delegate successfulPurchase:self restored:NO identifier:transaction.payment.productIdentifier receipt:transaction.transactionReceipt];

                     // and more code bla bla bla 

            break;

        case SKPaymentTransactionStateRestored:

                    // and more code bla bla bla 

                          [self restorePurchase];
                          NSLog(@"PASO 3");

            break;

        case SKPaymentTransactionStateFailed:

                    // and more code bla bla bla 

                           [self failedNotification];
                           NSLog(@"PASO 4");

            break;

                    //------------------------------------------//
                    //               THANKS GUYS                //
                    //          GRETTINGS FROM BOLIVIA          //
                    //             ROCK ON!!!! n_n'             //
                    //------------------------------------------//

    }
   }
  }