C# 微信v3退款

小程序：扫一扫查出行
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复制小程序

1.退款需要退款证书。C#都是用p12的证书，双击证书导入，密码是mch_id（商户号）

2.调用微信退款接口进行退款操作

string resp=string.Empty
string cert = Server.MapPath("apiclient_cert.p12");
string password = mch_id;（商户号）
ServicePointManager.ServerCertificateValidationCallback = new RemoteCertificateValidationCallback(CheckValidationResult); //这两句特别注意 // X509Certificate cer = new X509Certificate(cert, password);//线下发布需要添加的
X509Certificate2 cer = new X509Certificate2(cert, password, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);//线上发布需要添加 HttpWebRequest webrequest = (HttpWebRequest)HttpWebRequest.Create(url);
webrequest.ClientCertificates.Add(cer);
webrequest.Method = "post";
webrequest.ContentType = "application/x-www-form-urlencoded";
webrequest.ContentLength = xml.Length;
HttpWebResponse response = null;
try
{
StreamWriter swRequestWriter = new StreamWriter(webrequest.GetRequestStream());
swRequestWriter.Write(xml); if (swRequestWriter != null)
swRequestWriter.Close(); response = (HttpWebResponse)webrequest.GetResponse();
using (StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default))
{
resp = reader.ReadToEnd();
}
}
catch (Exception exp)
{
throw exp;
}
finally
{
if (response != null)
response.Close();
}分享几个退款时遇到的问题
1、退款提示:订单号非法
原因：退款的订单号错误导致的
2、退款时提示：基础连接已关闭，或被意外关闭（验证证书的问题）
原因：首先要通过证书请求退款的接口，其次要把下面的这行语句

// X509Certificate cer = new X509Certificate(cert, password);//线下发布需要添加的
修改成这样的才可以
X509Certificate2 cer = new X509Certificate2(cert, password, X509KeyStorageFlags.PersistKeySet | X509KeyStorageFlags.MachineKeySet);//线上发布需要添加
3、 Miss Parameters
原因：传参数时，参数的名字和文档大小写不一致
4、每次退款，退款的订单号不能相同，否则无法退款