docs: 提供微信商户平台模块的示例项目

samples/SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5/Controllers/WxpayNotifyController.cs

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+using System;
+using System.Collections.Generic;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+
+namespace SKIT.FlurlHttpClient.Wechat.TenpayV3.Sample_Net5.Controllers
+{
+    [ApiController]
+    [Route("notify")]
+    public class WxpayNotifyController : ControllerBase
+    {
+        private readonly ILogger _logger;
+        public WxpayNotifyController(
+            ILoggerFactory loggerFactory)
+        {
+            _logger = loggerFactory.CreateLogger(GetType());
+        }
+
+
+        [HttpPost]
+        public async Task<IActionResult> ReceiveMessage()
+        {
+            // 接收服务器推送
+            // 文档：https://pay.weixin.qq.com/wiki/doc/apiv3/wechatpay/wechatpay4_2.shtml
+
+            using var reader = new StreamReader(Request.Body, Encoding.UTF8);
+            string content = await reader.ReadToEndAsync();
+            _logger.LogInformation("接收到微信支付推送的数据：{0}", content);
+
+            return new JsonResult(new { code = "SUCCESS", message = "成功" });
+        }
+    }
+}