Summary of common payment function development errors in mini program development-Mini Program Development-php.cn

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: '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) } } }); }

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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: '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.strMd5 var formData = "<xml>" formData += "<appid>" + appid + "</appid>" //appid formData += "<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Id formData += "<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>"

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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: '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); } }) } }) } }); }

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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: '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'); } }); } }) }

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