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我目前正在使用 PKPaymentAuthorizationViewController 并展示它以验证我的应用程序中的付款。我可以展示控制器，但收到一条错误消息，指出“应用内付款请求无效。PKPaymentRequest 必须包含类型为 'NSString' 的属性 'countryCode'”。我已经为付款请求设置了国家代码，但仍然收到此错误。如果我用来创建付款请求并显示控制器的代码，请附在下面。出于发布的目的，我已经删除了我的商家 ID。任何帮助，将不胜感激。

var applePayController = PKPaymentAuthorizationViewController()
                applePayController.delegate = self

                let request = PKPaymentRequest()

                let supportedPaymentNetworks = [PKPaymentNetwork.visa, PKPaymentNetwork.masterCard, PKPaymentNetwork.amex, PKPaymentNetwork.discover]
                let applePayMerchantID = "merchant.com.xxxxxxxxxx.XXXXXXXXXXX"

                request.countryCode = "US"
                request.currencyCode = "USD"
                request.merchantIdentifier = applePayMerchantID
                request.supportedNetworks = supportedPaymentNetworks
                request.merchantCapabilities = PKMerchantCapability.capability3DS


                let price = Decimal(self.creditsPrice[index])
                let priceDecimal = NSDecimalNumber(decimal: price)

                request.paymentSummaryItems.append(PKPaymentSummaryItem(label: "for \(self.credits[index]) Credits", amount: priceDecimal))

                applePayController = PKPaymentAuthorizationViewController(paymentRequest: request)

                self.paymentName = self.credits[index]
                self.paymentValue = self.creditsPrice[index]

                if PKPaymentAuthorizationViewController.canMakePayments(usingNetworks: supportedPaymentNetworks) {

                    self.present(applePayController, animated: true, completion: nil)

                } else {

                    self.displayAlert(title: "Error", message: "Please setup Apple Pay before trying to purchase credits")
                }
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