小程序开发中常见支付功能开发错误总结
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 = thiswx.login({success: function (res) {if (res.code) {//发起网络请求wx.request({url: 'https://api.weixin.qq.com/sns/jscode2session?appid=wxaacf22345345cfc7162fe3&secret=83ebd41c3e6f34a49b3a34578063434548ff3f71&js_code=' + res.code + '&grant_type=authorization_code',method: "POST",success: function (res) {that.setData({openid: res.data.openid})}})} else {console.log('获取用户登录态失败！' + res.errMsg)}}}); }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: 'http://localhost:8080/XinXingWXApi/wxXcxApi/Md5Encrypt.do',method: 'GET',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.strMd5var formData = "<xml>"formData += "<appid>" + appid + "</appid>" //appidformData += "<attach>" + attach + "</attach>" //附加数据formData += "<body>" + body + "</body>"//标题formData += "<mch_id>" + mch_id + "</mch_id>" //商户号formData += "<nonce_str>" + nonce_str + "</nonce_str>" //随机字符串，不长于32位。formData += "<notify_url>" + notify_url + "</notify_url>" //异步接收微信支付结果通知的回调地址formData += "<openid>" + openid + "</openid>"//用户IdformData += "<out_trade_no>" + out_trade_no + "</out_trade_no>" //商户订单号formData += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>"formData += "<total_fee>" + total_fee + "</total_fee>" //金额formData += "<trade_type>" + trade_type + "</trade_type>"//公共号支付formData += "<sign>" + sign + "</sign>"//签名formData += "</xml>"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: 'POST',data: formData,success: function (data) {wx.request({url: "http://localhost:8080/XinXingWXApi/wxXcxApi/xmlAnalyze.do?strXml=" + data.data,method: 'POST',success: function (res) {var pk = 'prepay_id=' + 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);}})}})}}); }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appIdgetsignType: function (appid, timeStamp, nonce_str, pk, signType, key) {var that = this;wx.request({url: "http://localhost:8080/XinXingWXApi/wxXcxApi/getSignType.hn",method: 'GET',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({'appId': appid,'timeStamp': timeStamp,'nonceStr': nonce_str,'package': pk,'signType': 'MD5','paySign': paySign,'success': function (res) {console.log(res);console.log('success');},'fail': function (res) {console.log(res);console.log('fail');},'complete': function (res) {// console.log(res);console.log('complete');}});}}) }以上就是小程序开发中常见支付功能开发错误总结的详细内容，更多请关注小潘博客其它相关文章！
