Authorize.Net-生成XML文档时出错

Question

我正在尝试通过Authorize.Net设置定期订阅付款。我基本上逐字遵循了他们的示例代码，并收到以下错误：

  

System.InvalidOperationException：'生成一个错误   XML文档。”   内部异常1：InvalidOperationException：类型System.String   在这种情况下可能无法使用。

如您所见，错误消息并不是非常有用。该错误发生在“ controller.Execute（）”上。任何想法可能是什么问题？提前致谢。

public ANetApiResponse Run(string apiLoginId, string apiTransactionKey, AuthNetQuickCheckoutModel model)
    {
        ApiOperationBase<ANetApiRequest, ANetApiResponse>.RunEnvironment = AuthorizeNet.Environment.SANDBOX; 
        ApiOperationBase<ANetApiRequest, ANetApiResponse>.MerchantAuthentication = new merchantAuthenticationType()
        {
            name = apiLoginId,
            ItemElementName = ItemChoiceType.transactionKey,
            Item = apiTransactionKey,

        };

        paymentScheduleTypeInterval interval = new paymentScheduleTypeInterval
                                                   {
                                                       length = (short)model.SubscriptionLength,
                                                       unit = ARBSubscriptionUnitEnum.months
                                                   };


        paymentScheduleType schedule = new paymentScheduleType
        {
            interval = interval,
            startDate = DateTime.Now,
            totalOccurrences = (short)model.SubscriptionLength,
            trialOccurrences = 0,  
        };

        #region Payment Information

        var creditCard = new creditCardType
        {
            cardNumber = model.CardNumber,
            expirationDate = model.ExpirationDate,
            cardCode = model.CardCode
        };

        paymentType cc = new paymentType { Item = creditCard };

        #endregion

        nameAndAddressType addressInfo = new nameAndAddressType()
        {
            firstName = model.FirstName,
            lastName = model.LastName
            //company = 
        };

        ARBSubscriptionType subscriptionType = new ARBSubscriptionType()
        {
            amount = model.Amount,
            trialAmount = 0,
            paymentSchedule = schedule,
            billTo = addressInfo,
            payment = cc
        };

        var request = new ARBCreateSubscriptionRequest { subscription = subscriptionType };

        var controller = new ARBCreateSubscriptionController(request);
        controller.Execute();

        ARBCreateSubscriptionResponse response = controller.GetApiResponse();

        if (response != null && response.messages.resultCode == messageTypeEnum.Ok)
        {
            if (response?.messages.message != null)
            {
                Console.WriteLine("Success, Subscription ID: " + response.subscriptionId);
            }
        }
        else if (response != null)
        {
            Console.WriteLine("Error: " + response.messages.message[0].code + " " + response.messages.message[0].text);
        }

        return response;
    }
}