C# Paypal expresscheckout ErrorCode=7&；Desc=字段格式错误：10471 ReturnRUL无效

我在

asp.net C#

中使用贝宝

ExpressCheckout

，出现错误：

ErrorCode=7&Desc=字段格式错误：10471 ReturnRUL无效

当我调试代码时

string returnURL = "http://www.mycompany.com/paypalConfirm.aspx";
.....
string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp, uid.ToString());

NVPCodec decoder = new NVPCodec(); 
decoder.Decode(pStresponsenvp);

returnURL

在

pStrrequestforNvp

中显示了

returnURL=http%3a%2f%2fwww.mycompany.com%2fpaypalConfirm.aspx

，我觉得这很正常

有人能帮我找出为什么我出现

10471

错误吗

这是我的全部请求代码： string host=“www.paypal.com”

---

HTTPACK返回错误代码。

根据一些论坛，这可能是一个问题，Express（PROFE工作如预期…）您可以考虑PRO版本，直到贝宝修复Express版本号，这不是Express签出的问题。尝试删除URL编码，看看是否有帮助。如果没有，请发布一个完整原始请求的示例，这样我就可以达到峰值。感谢回复Andrew，但是如何删除URL编码？@AndrewAngell您节省了我的时间，删除URL编码很有效。

string returnURL = "https://www.mycompany.com/paypalconfirm.aspx";
string cancelURL = "https://www.mycompany.com/paypalconfirm.aspx";

NVPCodec encoder = new NVPCodec();
encoder["METHOD"] = "SetExpressCheckout";
encoder["RETURNURL"] = returnURL;
encoder["CANCELURL"] = cancelURL;
encoder["PAYMENTREQUEST_0_AMT"] = amt;
encoder["PAYMENTREQUEST_0_PAYMENTACTION"] = "Sale";
encoder["PAYMENTREQUEST_0_CURRENCYCODE"]  = "USD";
encoder["PAYMENTREQUEST_0_SHIPTONAME"]       = shipToName;
encoder["PAYMENTREQUEST_0_SHIPTOSTREET"]     = shipToStreet;
encoder["PAYMENTREQUEST_0_SHIPTOSTREET2"]    = shipToStreet2;
encoder["PAYMENTREQUEST_0_SHIPTOCITY"]       = shipToCity;
encoder["PAYMENTREQUEST_0_SHIPTOSTATE"]      = shipToState;
encoder["PAYMENTREQUEST_0_SHIPTOZIP"]        = shipToZip;
encoder["PAYMENTREQUEST_0_SHIPTOCOUNTRYCODE"]= shipToCountryCode;

string pStrrequestforNvp = encoder.Encode();
string pStresponsenvp = HttpCall(pStrrequestforNvp,"");

NVPCodec decoder = new NVPCodec();
decoder.Decode(pStresponsenvp);