gistfile1.m

- (IBAction)buyMoreButtonClicked:(id)sender
{
    [GGProgressHUD showActivity];
    NSString *productId = nil;
    if (sender == btnCredit1) {
        productId = IAP_PRODUCT_CREDIT1;
    } else if (sender == btnCredit2) {
        productId = IAP_PRODUCT_CREDIT2;
    } else {
        productId = IAP_PRODUCT_CREDIT3;
    }
    
    SKProduct *product = [[TNStoreHelper requestedProducts] valueForKey:productId];
    if (product) {
        [self purchaseProduct:product];
        return;
    }
    
    [[TNStoreHelper sharedInstance] requestProducts:[NSSet setWithObject:productId] withCompletionHandler:^(BOOL success, NSArray *products) {
        
        if (success && [products count] > 0) {
            [self purchaseProduct:[products objectAtIndex:0]];
        } else {
            [GGProgressHUD hideActivity];
        }
    }];
}

- (void)purchaseProduct:(SKProduct *)product
{
    [GGProgressHUD showActivity];
    [[TNStoreHelper sharedInstance] buyProduct:product withCompletionHandler:^(BOOL buySuccess, SKPaymentTransaction *transaction, BOOL isRestore) {
        if (buySuccess) {
            int score = 0;
            if ([[product productIdentifier] isEqualToString:IAP_PRODUCT_CREDIT1]) {
                score = IAP_TOPUP_CREDIT1;
            } else if ([[product productIdentifier] isEqualToString:IAP_PRODUCT_CREDIT2]) {
                score = IAP_TOPUP_CREDIT2;
            } else if ([[product productIdentifier] isEqualToString:IAP_PRODUCT_CREDIT3]) {
                score = IAP_TOPUP_CREDIT3;
            }
            [GGWebService creditTopup:[NSNumber numberWithInt:score] didCompleted:^(NSHTTPURLResponse *response, id data, NSError *error) {
                [GGProgressHUD hideActivity];
            }];
        } else {
            [GGProgressHUD hideActivity];
        }
    }];
}