Consumable in-app purchases

Hi, I am trying to create in my game in the app store so that players can buy virtual currencies which are consumables. But I'm a little unsure if my approach is correct or not. So I think it would be nice to ask for help here.

After clicking the Buy button, the buyProductIdentifier is called

- (void)buyProductIdentifier:(NSString *)productIdentifier {

  NSLog(@"Buying %@...", productIdentifier);

  SKPayment *payment = [SKPayment paymentWithProductIdentifier: productIdentifier];
  [[SKPaymentQueue defaultQueue] addPayment:payment];

}  

      

        
        
        
      

    

and then complete the payment

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


  CCLOG(@"PAYMENT QUEUE CALLED!");

  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;
      }
  }
}

      

        
        
        
      

    

I tried commenting out the SKPaymentTransactionStateRestored case to force the player to make a purchase every time, rather than popping up a message saying "you already bought this but it hasn't been downloaded."

Is this approach correct? if not can you guys give me some advice?

Many thanks.