public class Config{ 
// 应用ID,您的APPID 
public static string AppId = ""; 
// 支付宝网关 
public static string Gatewayurl = ""; 
// 商户私钥，您的原始格式RSA私钥 
public static string PrivateKey = ""; 
// 支付宝公钥,查看地址：https://openhome.alipay.com/platform/keyManage.htm 对应APPID下的支付宝公钥。 
public static string AlipayPublicKey = ""; 
 // 签名方式 
public static string SignType = "RSA2"; 
// 编码格式 
public static string CharSet = "UTF-8";}

/// 发起支付请求/// </summary>/// <param name="tradeno">外部订单号，商户网站订单系统中唯一的订单号</param>/// 
<param name="subject">订单名称</param>/// <param name="totalAmout">付款金额</param>/// 
<param name="itemBody">商品描述</param>/// <returns></returns>[HttpPost]
public void PayRequest(string tradeno,string subject,string totalAmout,string itemBody){ 
DefaultAopClient 
client = new DefaultAopClient(Config.Gatewayurl, Config.AppId, Config.PrivateKey, "json", "2.0", Config.SignType, Config.AlipayPublicKey, Config.CharSet, false); // 组装业务参数model AlipayTradePagePayModel model = new AlipayTradePagePayModel(); 
model.Body = itemBody; 
model.Subject = subject; 
model.TotalAmount = totalAmout; 
model.OutTradeNo = tradeno; 
model.ProductCode = "FAST_INSTANT_TRADE_PAY"; AlipayTradePagePayRequest 
request = new AlipayTradePagePayRequest(); 
// 设置同步回调地址 
request.SetReturnUrl("http://localhost:5000/Pay/Callback"); 
 // 设置异步通知接收地址 
request.SetNotifyUrl(""); 
// 将业务model载入到request 
request.SetBizModel(model); 
var response = client.SdkExecute(request); Console.WriteLine($"订单支付发起成功，订单号：{tradeno}"); 
//跳转支付宝支付 
Response.Redirect(Config.Gatewayurl + "?" + response.Body);}

/// <summary>/// 支付异步回调通知 需配置域名 因为是支付宝主动post请求这个action 所以要通过域名访问或者公网ip/// </summary>public async void Notify(){ 
/* 实际验证过程建议商户添加以下校验。 
 1、商户需要验证该通知数据中的out_trade_no是否为商户系统中创建的订单号， 
 2、判断total_amount是否确实为该订单的实际金额（即商户订单创建时的金额）， 
3、校验通知中的seller_id（或者seller_email) 是否为out_trade_no这笔单据的对应的操作方（有的时候，一个商户可能有多个seller_id/seller_email） 
 4、验证app_id是否为该商户本身。 */ Dictionary<string, string> sArray = GetRequestPost(); 
if (sArray.Count != 0) 
 { 
bool flag = AlipaySignature.RSACheckV1(sArray, Config.AlipayPublicKey,Config.CharSet, Config.SignType, false); 
if (flag) 
{  
//交易状态  
//判断该笔订单是否在商户网站中已经做过处理  
 //如果没有做过处理，根据订单号（out_trade_no）在商户网站的订单系统中查到该笔订单的详细，并执行商户的业务程序  
//请务必判断请求时的total_amount与通知时获取的total_fee为一致的  
//如果有做过处理，不执行商户的业务程序  
 //注意：  
//退款日期超过可退款期限后（如三个月可退款），支付宝系统发送该交易状态通知  
Console.WriteLine(Request.Form["trade_status"]);  
await Response.WriteAsync("success"); 
 } 
else 
{  
await Response.WriteAsync("fail"); 
} 
 }}

/// <summary>/// 支付同步回调/// </summary>[HttpGet]public IActionResult Callback(){ /* 实际验证过程建议商户添加以下校验。 
 1、商户需要验证该通知数据中的out_trade_no是否为商户系统中创建的订单号， 
2、判断total_amount是否确实为该订单的实际金额（即商户订单创建时的金额）， 
3、校验通知中的seller_id（或者seller_email) 是否为out_trade_no这笔单据的对应的操作方（有的时候，一个商户可能有多个seller_id/seller_email） 
 4、验证app_id是否为该商户本身。 */ Dictionary<string, string> sArray = GetRequestGet(); if (sArray.Count != 0) 
{ 
 bool flag = AlipaySignature.RSACheckV1(sArray, Config.AlipayPublicKey, Config.CharSet, Config.SignType, false); 
if (flag) 
{  
Console.WriteLine($"同步验证通过，订单号：{sArray["out_trade_no"]}");  
 ViewData["PayResult"] = "同步验证通过"; } else 
{  
Console.WriteLine($"同步验证失败，订单号：{sArray["out_trade_no"]}");  
 ViewData["PayResult"] = "同步验证失败"; 
 } 
} return View();
}

[HttpPost]public JsonResult Query(string tradeno, string alipayTradeNo){ 
 DefaultAopClient client = new DefaultAopClient(Config.Gatewayurl, Config.AppId, Config.PrivateKey, "json", "2.0", Config.SignType, Config.AlipayPublicKey, Config.CharSet, false); 
AlipayTradeQueryModel model = new AlipayTradeQueryModel(); 
 model.OutTradeNo = tradeno; 
model.TradeNo = alipayTradeNo; 
 AlipayTradeQueryRequest request = new AlipayTradeQueryRequest(); 
request.SetBizModel(model); 
var response = client.Execute(request); 
return Json(response.Body);}

/// <summary>
/// 订单退款
/// </summary>/// <param name="tradeno">商户订单号</param>/// <param name="alipayTradeNo">支付宝交易号</param>/// <param name="refundAmount">退款金额</param>/// <param name="refundReason">退款原因</param>/// <param name="refundNo">退款单号</param>/// <returns></returns>[HttpPost]public JsonResult Refund(string tradeno,string alipayTradeNo,string refundAmount,string refundReason,string refundNo){ DefaultAopClient client = new DefaultAopClient(Config.Gatewayurl, Config.AppId, Config.PrivateKey, "json", "2.0", Config.SignType, Config.AlipayPublicKey, Config.CharSet, false); 
 AlipayTradeRefundModel model = new AlipayTradeRefundModel(); model.OutTradeNo = tradeno; model.TradeNo = alipayTradeNo; 
model.RefundAmount = refundAmount; model.RefundReason = refundReason; model.OutRequestNo = refundNo; AlipayTradeRefundRequest request = new AlipayTradeRefundRequest(); 
request.SetBizModel(model); 
 var response = client.Execute(request); return Json(response.Body);}

/// <summary>
/// 退款查询
/// </summary>
/// <param name="tradeno">商户订单号</param>
/// <param name="alipayTradeNo">支付宝交易号</param>
/// <param name="refundNo">退款单号</param>
/// <returns></returns>
[HttpPost]
public JsonResult RefundQuery(string tradeno,string alipayTradeNo,string refundNo)
{
 DefaultAopClient client = new DefaultAopClient(Config.Gatewayurl, Config.AppId, Config.PrivateKey, "json", "2.0",
  Config.SignType, Config.AlipayPublicKey, Config.CharSet, false);
 if (string.IsNullOrEmpty(refundNo))
 {
  refundNo = tradeno;
 }
 AlipayTradeFastpayRefundQueryModel model = new AlipayTradeFastpayRefundQueryModel();
 model.OutTradeNo = tradeno;
 model.TradeNo = alipayTradeNo;
 model.OutRequestNo = refundNo;
 AlipayTradeFastpayRefundQueryRequest request = new AlipayTradeFastpayRefundQueryRequest();
 request.SetBizModel(model);
 var response = client.Execute(request);
 return Json(response.Body);
}

/// <summary>
/// 关闭订单
/// </summary>
/// <param name="tradeno">商户订单号</param>
/// <param name="alipayTradeNo">支付宝交易号</param>
/// <returns></returns>
[HttpPost]
public JsonResult OrderClose(string tradeno, string alipayTradeNo)
{
 DefaultAopClient client = new DefaultAopClient(Config.Gatewayurl, Config.AppId, Config.PrivateKey, "json", "2.0",
  Config.SignType, Config.AlipayPublicKey, Config.CharSet, false);
 AlipayTradeCloseModel model = new AlipayTradeCloseModel();
 model.OutTradeNo = tradeno;
 model.TradeNo = alipayTradeNo;
 AlipayTradeCloseRequest request = new AlipayTradeCloseRequest();
 request.SetBizModel(model);
 var response = client.Execute(request);
 return Json(response.Body);
}