微信小程序--使用云开发完成支付闭环 1.流程介绍
云函数统一下单 对应云函数 unipay
【CloudPay.unifiedOrder】
函数思路 : 调用云函数封装功能，用时间戳生成对应订单号，进行统一下单处理，如果两个返回结果都是SUCCESS,那么将该订单记录写入数据库，状态设置为waiting
body填写商户名称
subMchId填写商户ID，在云函数环境管理后台获取
const cloud = require('wx-server-sdk') cloud.init({ env: '' }) const db = cloud.database(); const _ = db.command; exports.main = async (event, context) => { var fee = parseInt(event.fee); let paydata = event.paydata; let tradeno = GetTradeNo(); const res = await cloud.cloudPay.unifiedOrder({ "body": "", "outTradeNo": tradeno, "spbillCreateIp": "127.0.0.1", "subMchId": "", "totalFee": fee, "envId": "云函数环境ID", "functionName": "unipaynotify" }) res.outTradeNo = tradeno res.totalFee = fee //在此处写入订单表 paydata.paytimestamp = res.payment.timeStamp; paydata.orderid = res.outTradeNo;//订单号 paydata.paystatus = 'waiting' paydata.orderamount = fee paydata.paytime = TimeCode() paydata.mchid = res.subMchId if(res.returnCode=='SUCCESS' && res.resultCode=='SUCCESS'){ db.collection('pay_record').add({ data:paydata }) } return res } function GetTradeNo() { var outTradeNo = ""; //订单号 for (var i = 0; i < 6; i++) //6位随机数，用以加在时间戳后面。 { outTradeNo += Math.floor(Math.random() * 10); } outTradeNo = "LHZHWY" + new Date().getTime() + outTradeNo; //时间戳，用来生成订单号。 return outTradeNo; } function TimeCode() { var date = new Date(); var year = date.getFullYear() var month = date.getMonth() + 1 var day = date.getDate() var hour = date.getHours() var minute = date.getMinutes() var second = date.getSeconds() return [year, month, day].map(formatNumber).join('-') + ' ' + [hour, minute, second].map(formatNumber).join(':') } function TimeCodeYmd(){ var date = new Date(); var year = date.getFullYear() var month = date.getMonth() + 1 var day = date.getDate() return [year, month, day].map(formatNumber).join('-'); } function formatNumber(n) { n = n.toString() return n[1] ? n : '0' + n }根据统一下单返回参数，调用微信支付接口
fee 需要根据订单计算 fee单位为0.01
paydata是商品订单参数，形式为Object，可存放顾客手机号，支付总金额，支付哪一项费用等信息
TimerQuery是定时器，查询支付结果
let fee = 1 //该费用只是代指，以实际开发为准 wx.cloud.callFunction({ name: 'unipay', data: { fee: fee, paydata: paydata }, success: res => { const payment = res.result.payment console.log(res) //在此处获得支付订单号信息,支付时间，支付状态 var tradeno = res.result.outTradeNo wx.requestPayment({ ...payment, success(res) { //成功回调，这个时候微信支付后台会触发回调函数 console.log(res) that.TimerQuery(tradeno, paydata); }, fail(res) { that.setData({ error: '支付失败' }) } }) }, fail: r => { console.log(r) that.setData({ error: '云服务器错误' }) } })回调函数unipaynotify
【Cloud.paymentCallback】
订单在支付成功时会触发该回调函数
该回调函数必须有返回值，且必须是固定格式
根据回调函数携带的订单号，修改对应订单号的waiting状态为success，并且返回对应格式的返回信息
字段名 变量名 必填 类型 描述错误码 errcode 是 Number 0
错误信息 errmsg 是 String
回调函数携带参数如下
{ appid: '', bankType: 'OTHERS', cashFee: 1, feeType: 'CNY', isSubscribe: 'N', mchId: '', nonceStr: '', openid: '', outTradeNo: '', resultCode: 'SUCCESS', returnCode: 'SUCCESS', subAppid: '', subIsSubscribe: 'N', subMchId: '', subOpenid: '', timeEnd: '', totalFee: 1, tradeType: 'JSAPI', transactionId: '', userInfo: { appId: '', openId: '' } } const cloud = require('wx-server-sdk') cloud.init({ env: '填写你的云环境ID' }) const db = cloud.database(); const _ = db.command; // 云函数入口函数 exports.main = async (event, context) => { console.log('支付成功回调函数触发') console.log(event) let tradeno = event.outTradeNo; console.log(tradeno) try { let res = await db.collection('pay_record').where({ orderid:tradeno }).update({ data:{ paystatus:'success' } }) console.log(res) } catch (error) { return { errmsg: 'SERVER_ERROR', errcode: -1 } } return { errmsg: 'SUCCESS', errcode: 0 } }定时查询器，查询结果TimerQuery
没间隔一秒查询一次，查询到该订单记录为success清除定时触发器，并展示成功信息