一：获取微信支付 MCHID,KEY,APPID,APPSecret 四个支付关键值.
      微信支付商户平台 https://pay.weixin.qq.com/index.php/core/home/login?return_url=%2F
  　 1.登录微信支付商户平台获取到商户号(MCHID),
  　 2.在"账号中心"栏目下"API安全"栏目里设置API密钥(KEY)

　  微信公众号： https://mp.weixin.qq.com/
     1.登录微信公众在"基本配置"栏获取应用ID(APPID)和应用密钥(APPSecret)
     2.在"接口权限"栏目下"网页账号"绑定正式支付的域名 (如:××××.net,不要http:和"/"斜杠)
     3.在"微信支付"栏目下"开发配置"里面设置公众支付的支付授权目录(如:××××.net/WeChatWeb/)

二：把WxPayAPI添加到制作项目中,在Config.cs文件里修改获取到的MCHID,KEY,APPID,APPSecret四个关键值以及NOTIFY_URL值(NOTIFY_URL是支付授权目录),并在MVC项目里建一个WeChatWeb控制器,里面加上逻辑代码.并传递微信jsapi支付所需的参数.代码示例如下:

        后台Action代码
        /// <summary>
        /// 获取微信支付相关信息
        /// </summary>
        /// <returns></returns>
        [HttpGet]
        public virtual ActionResult Index()
        {
            JsApiPay jsApiPay = new JsApiPay();
            OStudent model = null;
            try
            {
                //调用【网页授权获取用户信息】接口获取用户的openid和access_token
                jsApiPay.GetOpenidAndAccessToken();
                //获取微信支付者公共id
                jsApiPay.openid = jsApiPay.openid;

                string ID = Request["ID"]; //如果要获取页面传递过来的值,需修改GetOpenidAndAccessToken()方法里面的代码,加上Request.Url.Query获取参数
                model = OStudentSiteService.GetByKey(id).AppendData as OStudent;
                if (model != null)
                {
                    jsApiPay.total_fee = 1;//测试  订单金额(1表示分,正式金额要*100)
                    jsApiPay.Order_ID = model.order_ID;  //订单号(自己定义订单号)                   
                }

                //JSAPI支付预处理
                //调用统一下单，获得下单结果
                WxPayData unifiedOrderResult = jsApiPay.GetUnifiedOrderResult();
                //从统一下单成功返回的数据中获取微信浏览器调起jsapi支付所需的参数
                var wxJsApiParam = jsApiPay.GetJsApiParameters();  //获取到的是json格式字符串
                ViewBag.wxJsApiParam = wxJsApiParam;   //前台页面js调用
                Log.Debug(this.GetType().ToString(), "wxJsApiParam : " + wxJsApiParam);
            }
            catch (Exception ex)
            {
                Response.Write(ex.Message + "," + ex.Source);
                Response.End();
            }
            return View(model);
        }
        
        //修改支付方式
        [HttpPost]
        public virtual JsonResult PayMethod()
        {
            AjaxJsonResult ajax = new AjaxJsonResult() { err = true, msg = string.Empty, timeout = 3 };
            string id = Request.Form["id"];
            string payMethod = Request.Form["payMethod"];
            var model = (Project.Core.Models.Model.OStudent)OStudentSiteService.GetByKey(id).AppendData;
            model.payMethod = payMethod; //支付方式
            OperationResult result = OStudentSiteService.Modify(model);
            if (result.ResultType == OperationResultType.Success)
            {
                ajax.err = false;
                ajax.msg = "操作成功";
            }
            return Json(ajax);
        }


        /// <summary>
        /// 修改支付状态
        /// </summary>
        /// <param name="userID"></param>
        /// <returns></returns>
        [HttpPost]
        public virtual string EditPayStatus(Guid userID)
        {
            string msg = "error";
            var model = OStudentSiteService.GetByKey(userID).AppendData as OStudent;
            model.Status = (int)X.Project.Site.Models.Enum.PayStatus.Success; //付款成功
            OperationResult result = OStudentSiteService.Modify(model);
            if (result.ResultType == OperationResultType.Success)
            {
                msg = "ok";               
            }
            return msg;
        }
       
      前台Index.chtml视图页面JS代码

     <script type="text/javascript">
      var _wxJsApiParam = eval(‘(@Html.Raw(ViewBag.wxJsApiParam))‘);

      function callpay() {
            //选择支付方式
            var payMethod = $("input[name=‘PayMethod‘]:checked").val();
            if (payMethod == "" || payMethod == null) {
                layer.msg("请选择支付方式", function () { })
                return false;
            }

            $.ajax({
                type: "POST",
                dataType: "JSON",
                url: ‘@Url.Action("PayMethod", "WeChatWeb")‘,
                data: {
                    payMethod: payMethod,
                    id: ‘@Model.ID‘
                },
                success: function (data) {
                    //表示修改支付方式成功
                    if (!data.err) {

                        //1表示微信支付,则调用微信支付
                        if (payMethod == "1") {
                            if (typeof WeixinJSBridge == "undefined") {
                                if (document.addEventListener) {
                                    document.addEventListener(‘WeixinJSBridgeReady‘, jsApiCall, false);
                                }
                                else if (document.attachEvent) {
                                    document.attachEvent(‘WeixinJSBridgeReady‘, jsApiCall);
                                    document.attachEvent(‘onWeixinJSBridgeReady‘, jsApiCall);
                                }
                            }
                            else {
                                jsApiCall();
                            }
                        } else if (payMethod == "2") {
                            layer.alert(‘恭喜您,操作成功!‘, function () {
                                 window.location.href = "@Url.Action(MVC.Default.Index())" ; //操作成功后的跳转页面
                            });
                        }

                } else {
                    layer.msg("操作失败", function () { })
                    return false;
                }
                }
            });
    }

    //调用微信JS api 支付
    function jsApiCall() {
        WeixinJSBridge.invoke(‘getBrandWCPayRequest‘, _wxJsApiParam,
                function (res) {
                    if (res.err_msg == "get_brand_wcpay_request:cancel") {

                        layer.msg("已取消支付", function () { });
                        return false;
                    } else if (res.err_msg == "get_brand_wcpay_request:ok") {
                        //支付成功
                        //ajax
                        $.ajax({
                            type: "POST",
                            dataType: "text",
                            url: ‘@Url.Action("EditPayStatus", "WeChatWeb")‘,
                            data: {
                                userID: ‘@Model.ID‘
                            },
                            error: function (request) {

                               layer.msg("服务器错误！", function () { });
                                return false;
                            },
                            success: function (data) {
                                window.location.href = "@Url.Action(MVC.Default.Index())"; //支付成功后跳转的页面
                            }
                        }); //ajax  end
                        }
                });
            }       
</script>

公司最近有微信支付功能,看了半天微信支付资料,也在网上查找了些资料,但是对于获取微信商户支付平台和微信公众号所需的东西无从下手.根据自己的摸索已经网上的指导,趁热把微信支付流程记录下来,供自己下次使用,也当是一次重新学习的机会.本女子不才,如有错误,还请各位大牛们见谅,也请大家多多指教!(第一次在博客园发表信息内心是激动且煎熬的)

微信公众号支付（提供MVC版本）