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Summary of WeChat Mini Program Development Payment Function Error

巴扎黑

Sep 12, 2017 am 09:43 AM

Function Applets pay

微信小程序支付功能开发错误总结

微信小程序支付终于踩完坑了，发现里面坑挺大的，现在发个贴，希望以后入坑的同学可以看一下：

https://pay.weixin.qq.com/wiki/doc/api/wxa/wxa_api.php?chapter=7_4&index=2

业务流程在这里大家看文档的时候可以看到。第一个坑，获取用户的openid，参数一定要拼在url连接上，否则会报{"errcode":40013,"errmsg":"invalid appid, hints: [ req_id: iil1ba0504ns86 ]"}错误

 onLoad: function () {
  var that = this
  wx.login({
   success: function (res) {
    if (res.code) {
     //发起网络请求
     wx.request({
      url: &#39;https://api.weixin.qq.com/sns/jscode2session?appid=wxaacf22345345cfc7162fe3&secret=83ebd41c3e6f34a49b3a34578063434548ff3f71&js_code=&#39; + res.code + &#39;&grant_type=authorization_code&#39;,
      method: "POST",
      success: function (res) {
       that.setData({
        openid: res.data.openid
       })
      }
     })
    } else {
     console.log(&#39;获取用户登录态失败！&#39; + res.errMsg)
    }
   }
  });
 }

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第二个坑，支付统一下单接口，签名这个坑是比较多人遇到问题的这个是MD5加密经常和签名工具里面的加密签名不一样

签名加密工具地址：https://pay.weixin.qq.com/wiki/doc/api/jsapi.php?chapter=20_1

签名加密的时候要转成utf-8,加密我用自己的接口进行加密的 digest.update(data.getBytes("utf-8"));

 // 统一下单接口获取sign（签名）
 paysignjsapi: function (appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type, key) {
  var self = this;
  //加密签名
  wx.request({
   url: &#39;http://localhost:8080/XinXingWXApi/wxXcxApi/Md5Encrypt.do&#39;,
   method: &#39;GET&#39;,
   data: {
    appid: appid,
    attach: attach,
    body: body,
    mch_id: mch_id,
    nonce_str: nonce_str,
    notify_url: notify_url,
    openid: openid,
    out_trade_no: out_trade_no,
    spbill_create_ip: spbill_create_ip,
    total_fee: total_fee,
    trade_type: trade_type,
    key: key
   },
   //统一下单
   success: function (res) {
    var sign = res.data.strMd5
    var formData = "&lt;xml>"
    formData += "&lt;appid>" + appid + "&lt;/appid>" //appid 
    formData += "&lt;attach>" + attach + "&lt;/attach>" //附加数据 
    formData += "&lt;body>" + body + "&lt;/body>"    //标题
    formData += "&lt;mch_id>" + mch_id + "&lt;/mch_id>" //商户号 
    formData += "&lt;nonce_str>" + nonce_str + "&lt;/nonce_str>" //随机字符串，不长于32位。 
    formData += "&lt;notify_url>" + notify_url + "&lt;/notify_url>" //异步接收微信支付结果通知的回调地址
    formData += "&lt;openid>" + openid + "&lt;/openid>"  //用户Id
    formData += "&lt;out_trade_no>" + out_trade_no + "&lt;/out_trade_no>" //商户订单号
    formData += "&lt;spbill_create_ip>" + spbill_create_ip + "&lt;/spbill_create_ip>"
    formData += "&lt;total_fee>" + total_fee + "&lt;/total_fee>" //金额
    formData += "&lt;trade_type>" + trade_type + "&lt;/trade_type>"  //公共号支付
    formData += "&lt;sign>" + sign + "&lt;/sign>"//签名
    formData += "&lt;/xml>"

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返回数据解析xml

 //请求统一下单接口
    wx.request({
     url: "https://api.mch.weixin.qq.com/pay/unifiedorder",
     method: &#39;POST&#39;,
     data: formData,
     success: function (data) {
      wx.request({
       url: "http://localhost:8080/XinXingWXApi/wxXcxApi/xmlAnalyze.do?strXml=" + data.data,
       method: &#39;POST&#39;,
       success: function (res) {
        var pk = &#39;prepay_id=&#39; + res.data.prepayId;
        var timeStamp = self.createTimeStamp();
        //获取支付签名，并支付
        self.getsignType(appid, timeStamp, nonce_str, pk, "MD5", key);
       }
      })
     }
    })
   }
  });
 }

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第三就是调用支付了,这里也有几个小坑，第一就是appId很多写成appid就不行了，第二个就是preoatid 的参数格式要写对prepay_id=wx2017011711060194dccf725232155886323 第三个就是调用支付的时候报支付签名错误，也需要到签名接口查看签名是否一致，查看参数是否是对的，调用微信支付的时候必须加上appId

getsignType: function (appid, timeStamp, nonce_str, pk, signType, key) {
  var that = this;
  wx.request({
   url: "http://localhost:8080/XinXingWXApi/wxXcxApi/getSignType.hn",
   method: &#39;GET&#39;,
   data: {
    appId: appid,
    timeStamp: timeStamp,
    nonceStr: nonce_str,
    pk: pk,
    signType: signType,
    key: key
   },
   success: function (res) {
    console.log(res.data.paySign)
    var paySign = res.data.paySign
    //调用微信支付
    wx.requestPayment({
     &#39;appId&#39;: appid,
     &#39;timeStamp&#39;: timeStamp,
     &#39;nonceStr&#39;: nonce_str,
     &#39;package&#39;: pk,
     &#39;signType&#39;: &#39;MD5&#39;,
     &#39;paySign&#39;: paySign,
     &#39;success&#39;: function (res) {
      console.log(res);
      console.log(&#39;success&#39;);
     },
     &#39;fail&#39;: function (res) {
      console.log(res);
      console.log(&#39;fail&#39;);
     },
     &#39;complete&#39;: function (res) {
      // console.log(res);
      console.log(&#39;complete&#39;);
     }
    });
   }
  })
 }

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