微信app支付需要以下参数,类封装如下
public class WxPayModel { /// <summary> /// 应用ID /// </summary> public string appid { set; get; } = ""; /// <summary> /// 商户号 /// </summary> public string partnerid{ set; get; } = ""; /// <summary> /// 预支付交易会话ID /// </summary> public string prepayid { set; get; } = ""; /// <summary> /// 扩展字段 /// </summary> public string package { set; get; } = "Sign=WXPay"; /// <summary> /// 随机字符串 /// </summary> public string noncestr { set; get; } = ""; /// <summary> /// 时间戳 /// </summary> public string timestamp { set; get; } = ""; /// <summary> /// 签名 /// </summary> public string sign { set; get; } = ""; }
支付业务逻辑类如下,只需要传递订单号out_trade_no,描述body,价格total_fee,客户端ip,返回一个WxPayModel供app端调用。
/// <summary> /// 获取微信APP支付需要的信息 /// </summary> /// <param name="out_trade_no">订单号</param> /// <param name="body">描述</param> /// <param name="total_fee">总价</param> /// <param name="ip">客户IP</param> /// <returns></returns> public WxPayModel GetWxAppPayInfo(string out_trade_no, string body, string total_fee, string ip) { //构造返回内容,缺少prepayid和sign需要去微信服务器获取 WxPayModel wxPayModel = new WxPayModel() { appid = wxPayConfig.appid, partnerid = wxPayConfig.mchid, timestamp = Senparc.Weixin.Helpers.DateTimeHelper.GetWeixinDateTime(DateTime.Now) + "", noncestr = TenPayV3Util.GetNoncestr(), }; //构造请求参数 Senparc.Weixin.MP.TenPayLibV3.RequestHandler packageReqHandler = new Senparc.Weixin.MP.TenPayLibV3.RequestHandler(); #region 构造请求参数 packageReqHandler.SetParameter("appid", wxPayConfig.appid);//APPID packageReqHandler.SetParameter("mch_id", wxPayConfig.mchid);//商户号 packageReqHandler.SetParameter("nonce_str", Senparc.Weixin.MP.TenPayLibV3.TenPayV3Util.GetNoncestr());//随机串 packageReqHandler.SetParameter("body", body); packageReqHandler.SetParameter("out_trade_no", out_trade_no);//订单号 packageReqHandler.SetParameter("total_fee", (int)(Convert.ToDecimal(total_fee) * 100) + ""); //金额,以分为单位 packageReqHandler.SetParameter("spbill_create_ip", ip);//IP packageReqHandler.SetParameter("notify_url", wxPayConfig.notify_url); //回调地址 packageReqHandler.SetParameter("trade_type", "APP");//APP支付 packageReqHandler.SetParameter("sign", packageReqHandler.CreateMd5Sign("key", wxPayConfig.key));//商户API密钥(签名) #endregion //将参数转为xml字符串 string data = packageReqHandler.ParseXML(); //发起post异步请求,获取返回的内容 var result = PostWithStringFile(wxPayConfig.api_url, data); Log.Info("【GetWxAppPayInfo】订单:" + out_trade_no + ",请求得到的xml:" + result, "微信支付"); var res = System.Xml.Linq.XDocument.Parse(result);//解析xml,为了填充prepay_id参数和_paySign参数。 try { //填充prepay_id参数 wxPayModel.prepayid = res.Element("xml").Element("prepay_id").Value; SortedDictionary<string, object> sParams = new SortedDictionary<string, object>();
sParams.Add("appid", wxPayModel.appid);
sParams.Add("noncestr", wxPayModel.noncestr);
sParams.Add("package", "Sign=WXPay");
sParams.Add("partnerid", wxPayModel.partnerid);
sParams.Add("prepayid", wxPayModel.prepayid);
sParams.Add("timestamp", wxPayModel.timestamp);
//填充sign参数 wxPayModel.sign = GetSign(sParams, wxPayConfig.key); } catch (Exception ex) { Log.Info($"【GetWxAppPayInfo】订单:{out_trade_no },异常:{ ex.ToString()}", "微信支付"); } return wxPayModel; }
其中获取微信签名方法如下
#region 获取微信签名 /// <summary> /// 获取微信签名 /// </summary> /// <param name="sParams"></param> /// <returns></returns> public string GetSign(SortedDictionary<string, object> sParams, string key) { string sign = string.Empty; StringBuilder sb = new StringBuilder(); foreach (KeyValuePair<string, object> temp in sParams) { if (string.IsNullOrEmpty(temp.Value +"") || temp.Key.ToLower() == "sign") { continue; } sb.Append(temp.Key.Trim() + "=" + temp.Value.ToString() + "&"); } sb.Append("key=" + key.Trim() + ""); string signkey = sb.ToString(); sign = Senparc.Weixin.Helpers.EncryptHelper.GetMD5(signkey); return sign; } #endregion
这样只要应用开通了微信app支付功能,就能正确返回app sdk支付所需要的数据。