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我正在我的项目中进行 PayPal 集成。一切正常，但最后没有生成支付成功方法。我的付款成功代码是：

else if ([response isKindOfClass:[DoExpressCheckoutPaymentResponseDetails class]]) {    
    DoExpressCheckoutPaymentResponseDetails *dres = (DoExpressCheckoutPaymentResponseDetails *)response;
    if (dres.PaymentInfo.count > 0 && ((PaymentInfo *)[dres.PaymentInfo objectAtIndex:0]).TransactionID.length > 0)
    {
        [self paymentSuccess:((PaymentInfo *)[dres.PaymentInfo objectAtIndex:0]).TransactionID];
    }
    else
    {
        NSLog(@"Error came");
        [self paymentFailed];
    }
}

并且支付成功方式是... 

UINavigationController *navController = self.navigationController;

orderResultsViewController.forDelivery = ((ReviewOrderViewController *)[navController.viewControllers objectAtIndex:navController.viewControllers.count - 2]).forDelivery;
orderResultsViewController.transactionID = transactionID;
[navController popViewControllerAnimated:FALSE];
[navController setNavigationBarHidden:FALSE animated:TRUE];
[navController pushViewController:orderResultsViewController animated:TRUE];

如果你明白了，那就给我指明一个方向…… 

-(void)paymentFailed {
    [self.navigationController popViewControllerAnimated:TRUE];
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Order failed" 
                                                    message:@"Your order failed. Touch \"Pay with PayPal\" to try again."
                                                   delegate:nil 
                                          cancelButtonTitle:@"OK"
                                          otherButtonTitles:nil];
    [alert show];
    [alert release];
}

我超出警报视图并且付款订单失败....

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