微信支付（.NET版）

            //判断是否网页授权，获取授权code,没有代表没有授权，构造网页授权获取code,并重新请求
            if (string.IsNullOrEmpty(Request.QueryString["code"]))
            {
                string redirectUrl = _weChatPaySerivce.GetAuthorizeUrl(account.AppId, account.RedquestUrl,
                    "STATE" + "#wechat_redirect", "snsapi_base");
                return Redirect(redirectUrl);
            }

public Tuple<string, string> GetOpenidAndAccessTokenFromCode(string appId, string code, string appSecret)
        {
            Tuple<string, string> tuple = null;
            try
            {
                string url = string.Format("https://api.weixin.qq.com/sns/oauth2/access_token?appid={0}&secret={1}&code={2}&grant_type=authorization_code", appId, appSecret, code);
                string result = WeChatPayHelper.Get(url);
                AppLog.Write("微信支付-获取openid和access_token 请求Url:" + url + "result:" + result, AppLog.LogMessageType.Debug);
                if (!string.IsNullOrEmpty(result))
                {
                    var jd=Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, string>>(result);
                    tuple = new Tuple<string, string>(jd["openid"],jd["access_token"]);
                    AppLog.Write("微信支付-获取openid和access_token成功", AppLog.LogMessageType.Debug);
                }
            }
            catch (Exception ex)
            {
                AppLog.Write("微信支付：获取openid和access_tokenu异常", AppLog.LogMessageType.Debug,ex);
            }
            return tuple;
        }

            //创建支付应答对象
            RequestHandler packageReqHandler = new RequestHandler(null);
            //初始化
            packageReqHandler.Init();
            //时间戳
            string timeStamp = TenPayUtil.GetTimestamp();
            //随机字符串
            string nonceStr = TenPayUtil.GetNoncestr();
            //设置package订单参数 生成prepayId预支付Id
            packageReqHandler.SetParameter("appid", account.AppId);          //公众账号ID
            packageReqHandler.SetParameter("mch_id", account.PartnertId);          //商户号
            packageReqHandler.SetParameter("nonce_str", nonceStr);                    //随机字符串
            packageReqHandler.SetParameter("body", account.Body);
            packageReqHandler.SetParameter("out_trade_no", account.OrderSerialId);        //商家订单号
            packageReqHandler.SetParameter("total_fee", account.TotalAmount);                    //商品金额,以分为单位(money * 100).ToString()
            packageReqHandler.SetParameter("spbill_create_ip", account.RequestIp);   //用户的公网ip，不是商户服务器IP
            packageReqHandler.SetParameter("notify_url", account.NotifyUrl);            //接收财付通通知的URL
            packageReqHandler.SetParameter("trade_type", "JSAPI");                        //交易类型
            packageReqHandler.SetParameter("openid", account.OpenId);                        //用户的openId
            string sign = packageReqHandler.CreateMd5Sign("key", account.PaySignKey);
            packageReqHandler.SetParameter("sign", sign);                        //签名
            string prepayId = string.Empty;
            try
            {
                string data = packageReqHandler.ParseXML();
                var result = TenPayV3.Unifiedorder(data);
                MailHelp.SendMail("调用统一下单接口，下单结果：--"+result+"请求参数："+data);
                var res = XDocument.Parse(result);
                prepayId = res.Element("xml").Element("prepay_id").Value;
                AppLog.Write("调用统一下单接口获取预支付prepayId成功", AppLog.LogMessageType.Debug);
            }
            catch (Exception ex)
            {
                AppLog.Write("获取到openid和access_tokenu异常", AppLog.LogMessageType.Debug, ex);
                MailHelp.SendMail("调用统一下单接口获取预支付prepayid异常：", ex);
                return null;
            }

            //生成JsAPI支付参数
            RequestHandler paySignReqHandler = new RequestHandler(null);
            paySignReqHandler.SetParameter("appId", account.AppId);
            paySignReqHandler.SetParameter("timeStamp", timeStamp);
            paySignReqHandler.SetParameter("nonceStr", nonceStr);
            paySignReqHandler.SetParameter("package", string.Format("prepay_id={0}", prepayId));
            paySignReqHandler.SetParameter("signType", "MD5");
            string paySign = paySignReqHandler.CreateMd5Sign("key", account.PaySignKey);
            WeChatJsPayRequestModel resultModel = new WeChatJsPayRequestModel
            {
                AppId = account.AppId,
                NonceStr = nonceStr,
                TimeStamp = timeStamp,
                Package = string.Format("prepay_id={0}", prepayId),
                PaySign = paySign,
                SignType = "MD5"
            };

 ResponseHandler resHandler = new ResponseHandler(System.Web.HttpContext.Current);
            bool isSuccess = _weChatPaySerivce.ProcessNotify(resHandler);
            if (isSuccess)
            {
                string result = @"<xml>
                                    <return_code><![CDATA[SUCCESS]]></return_code>
                                    <return_msg><![CDATA[支付成功]]></return_msg>
                                 </xml>";
                HttpContext.Response.Write(result);
                HttpContext.Response.End();
            }
            return new EmptyResult();