PayPal iOS SDK不会将payerID保存到PayPal后端

Question

我有以下代码：

NSLog(@"Email address is %@",aPayerId);

PayPalPaymentViewController *paymentViewController;
paymentViewController = [[PayPalPaymentViewController alloc]
                            initWithClientId:kPayPalClientId receiverEmail:kPayPalReceiverEmail payerId:aPayerId payment:payment delegate:self
                         ];

[self presentViewController:paymentViewController animated:YES completion:nil];

电子邮件地址在输出窗口中打印出来。付款和一切都通过，但aPayerId数据不会被保存。

任何建议。