PayPal iOS SDK不适用于实时凭证

PayPal SDK：请求失败，出现错误：UNKNOWN_ERROR – 系统错误（UNKNOWN_ERROR）。 请稍后再试。 （400）| PayPal Debug-ID：3e8087cbf6bd1 [现场，PayPal iOS SDK 2.1.2]

组态：

// Set up payPalConfig _payPalConfig = [[PayPalConfiguration alloc] init]; _payPalConfig.acceptCreditCards = YES; _payPalConfig.languageOrLocale = @"en"; _payPalConfig.merchantName = @"MERCHANT NAME."; _payPalConfig.merchantPrivacyPolicyURL = [NSURL URLWithString:@"https://www.paypal.com/webapps/mpp/ua/privacy-full"]; _payPalConfig.merchantUserAgreementURL = [NSURL URLWithString:@"https://www.paypal.com/webapps/mpp/ua/useragreement-full"]; PayPalItem *selectedtemInfo = [PayPalItem itemWithName:productDetails withQuantity:1 withPrice:[[NSDecimalNumber alloc] initWithString:totalCostofProducts] withCurrency:@"USD" withSku:nil]; PayPalPayment *payment = [[PayPalPayment alloc] init]; payment.amount = total; payment.currencyCode = @"USD"; payment.shortDescription = @Description"; payment.items = selectedProductsItems; payment.paymentDetails = paymentDetails; PayPalPaymentViewController *paymentViewController = [[PayPalPaymentViewController alloc] initWithPayment:payment configuration:self.payPalConfig delegate:self];