微信JSAPI支付

1.登录微信公众平台：
1.1设置密钥
1.2设置服务器需要访问的IP
1.3设置服务器配置(上篇文章写到)
1.4查看APPID

2.登录商户平台
2.1申请和微信公众平台进行绑定
2.2域名回调地址
2.3查看API密钥(注意是V2版本还是V3版本)
2.4查看商户号

3.代码编写
3.1进行统一下单接口 (代码如下)
3.2返回的参数给前端，由前端进行调起微信支付
3.3后端设置回调地址和接口，进行设置订单的状态。

 var tenPayData = new TenPayRequestData(
                entity.AppId,
                entity.MchNo,
                "微信支付通知",
                outTradeNo,
                payMoney,
                ConfigurationManager.AppSettings["IP"],
                notifyUrl,
                (TenPayV3Type)Enum.Parse(typeof(TenPayV3Type), payType, true),
                openID,
                entity.MchKey,
                WeixinHelper.Tools.GetNonceStr(),
                attach,
                string.Empty
            );

            var unifiedordeResult = WeixinHelper.Pay.Unifiedorder(tenPayData);

public TenPayRequestData(string appId, string mchId, string body, string outTradeNo, decimal totalFee, string spbillCreateIp, string notifyUrl, TenPayV3Type tradeType, string openid, string key, string nonceStr, string attach, string product_id)
        {
            AppId = appId;
            MchId = mchId;
            NonceStr = nonceStr;
            Body = body ?? "Senparc TenpayV3";
            OutTradeNo = outTradeNo;
            TotalFee = totalFee;
            SpbillCreateIP = spbillCreateIp;
            NotifyUrl = notifyUrl;
            TradeType = tradeType;
            OpenId = openid;
            Key = key;
            Attach = attach;
            Product_id = product_id;

            #region 设置RequestHandler

            //创建支付应答对象
            PackageRequestHandler = new RequestHandler(null);
            //初始化
            PackageRequestHandler.Init();

            this.Body = Body = Body.Length > 128 ? Body.Substring(0, 120) + "..." : Body;

            //设置package订单参数
            PackageRequestHandler.SetParameter("appid", this.AppId);          //公众账号ID
            PackageRequestHandler.SetParameter("attach", this.Attach);
            PackageRequestHandler.SetParameter("mch_id", this.MchId);         //商户号
            PackageRequestHandler.SetParameter("nonce_str", this.NonceStr);                    //随机字符串
            PackageRequestHandler.SetParameter("body", this.Body);    //商品信息
            PackageRequestHandler.SetParameter("out_trade_no", this.OutTradeNo);      //商家订单号
            PackageRequestHandler.SetParameter("total_fee", (this.TotalFee * 100).ToString().Replace(".00", string.Empty).Replace(".0", string.Empty));                    //商品金额,以分为单位(money * 100).ToString()
            PackageRequestHandler.SetParameter("spbill_create_ip", this.SpbillCreateIP);   //用户的公网ip，不是商户服务器IP
            PackageRequestHandler.SetParameter("notify_url", this.NotifyUrl);          //接收财付通通知的URL
            PackageRequestHandler.SetParameter("trade_type", this.TradeType.ToString());                        //交易类型
            PackageRequestHandler.SetParameter("openid", this.OpenId);
            PackageRequestHandler.SetParameter("product_id", this.Product_id);
            Sign = PackageRequestHandler.CreateMd5Sign("key", this.Key);
            PackageRequestHandler.SetParameter("sign", Sign);                       //签名
            #endregion
        }

 var handle = WeixinHelper.Pay.GetJsPaySign(
                            entity.AppId,
                            WeixinHelper.Tools.GenerateTimeStamp().ToString(),
                            WeixinHelper.Tools.GetNonceStr(),
                            "prepay_id=" + unifiedordeResult.prepay_id,
                            entity.MchKey
                            );

                    var result = handle.GetAllParameters();
                    return Result.GetSuccess(result);

 public static RequestHandler GetJsPaySign(string appId, string timeStamp, string nonceStr, string package, string key,
                string signType = "MD5")
            {
                //设置支付参数
                RequestHandler paySignReqHandler = new RequestHandler(null);
                paySignReqHandler.SetParameter("appId", appId);
                paySignReqHandler.SetParameter("timeStamp", timeStamp);
                paySignReqHandler.SetParameter("nonceStr", nonceStr);
                paySignReqHandler.SetParameter("package", package);
                paySignReqHandler.SetParameter("signType", "MD5");
                var paySign = paySignReqHandler.CreateMd5Sign("key", key);
                paySignReqHandler.SetParameter("paySign", paySign);

                return paySignReqHandler;
            }

回调代码模块

 public ActionResult WeiXinPayNotify()
        {
            try
            {
                FixResponseHandler resHandler = new FixResponseHandler(HttpContext);
                resHandler.Init();

                string return_code = resHandler.GetParameter("return_code");
                string return_msg = resHandler.GetParameter("return_msg");

                string res = null;

                LogHelper.Info("微信支付回调:" + resHandler.ParseXML());

                resHandler.SetKey(H5Config.MichScript);

                //验证请求是否从微信发过来（安全）
                if (resHandler.IsTenpaySign())
                {
                    res = Handle(resHandler.GetParameter("out_trade_no"), resHandler.GetParameter("attach"));
                }
                else
                {
                    res = "wrong";
                }

                string xml = string.Format(@"<xml>
                                            <return_code><![CDATA[{0}]]></return_code>
                                            <return_msg><![CDATA[{1}]]></return_msg>
                                            </xml>", return_code, return_msg);

                LogHelper.Info("微信支付处理结果:" + res);

                return Content(xml, "text/xml");
            }
            catch (Exception ex)
            {
                LogHelper.Info("Result_Error:" + ex.ToString());

                return null;
            }
        }
        private Dictionary<string, string> GetRequestPost()
        {
            Dictionary<string, string> sArray = new Dictionary<string, string>();

            if (HttpContext.Request.Method.ToUpper() == "POST" && HttpContext.Request.HasFormContentType)
            {
                foreach (KeyValuePair<string, StringValues> item in HttpContext.Request.Form)
                {
                    sArray.Add(item.Key, item.Value[0]);
                }
            }

            foreach (KeyValuePair<string, StringValues> item2 in HttpContext.Request.Query)
            {
                sArray.Add(item2.Key, item2.Value[0]);
            }

            return sArray;

        }

        private string Handle(string out_trade_no,string memberCode)
        {
            var service = IocProxyFactory.GetService<IH5Service>();

            LogHelper.Info("微信支付流水号:" + out_trade_no);

            var result = service.SetWxFinishPayCallback(out_trade_no,memberCode);

            if (result)
            {
                return "success";
            }
            else
            {
                return "wrong";
            }
        }