云开发支付的代码，有需要的进。
真机测试已通过。你照抄就行，保证可通过。 最新完美版本可供参考： https://developers.weixin.qq.com/community/develop/article/doc/0004c4a50a03107eaa79f03cc56c13 小程序端： wx.cloud.callFunction({ name: 'getPay' , data: { total_fee: parseFloat(0.01).toFixed(2) * 100, attach: 'anything', body: 'whatever' } }) .then( res => { wx.requestPayment({ appId: res.result.appid, timeStamp: res.result.timeStamp, nonceStr: res.result.nonce_str, package: 'prepay_id=' + res.result.prepay_id, signType: 'MD5', paySign: res.result.paySign, success: res => { console.log(res) } }) }) 云函数：getPay getPay目录下共两个文件： 1､index.js 2､package.json index.js代码如下： const key = "YOURKEY1234YOURKEY1234YOURKEY123"//这是商户的key，不是小程序的密钥，32位。 const mch_id = "1413090000" //你的商户号 //将以上的两个参数换成你的，然后以下可以不用改一个字照抄 const rp = require('request-promise') const crypto = require('crypto') function paysign({ ...args }) { let sa = [] for (let k in args) sa.push( k + '=' + args[k]) sa.push( 'key=' + key) return crypto.createHash('md5').update(sa.join('&'), 'utf8').digest('hex').toUpperCase() } exports.main = async (event, context) => { const appid = event.userInfo.appId const openid = event.userInfo.openId const attach = event.attach const body = event.body const total_fee = event.total_fee const notify_url = "https://whatever.com/notify" const spbill_create_ip = "118.89.40.200" const nonce_str = Math.random().toString(36).substr(2, 15) const timeStamp = parseInt(Date.now() / 1000) + '' const out_trade_no = "otn" + nonce_str + timeStamp let formData = "<xml>" formData += "<appid>" + appid + "</appid>" formData += "<attach>" + attach + "</attach>" formData += "<body>" + body + "</body>" formData += "<mch_id>" + mch_id + "</mch_id>" formData += "<nonce_str>" + nonce_str + "</nonce_str>" formData += "<notify_url>" + notify_url + "</notify_url>" formData += "<openid>" + openid + "</openid>" formData += "<out_trade_no>" + out_trade_no + "</out_trade_no>" formData += "<spbill_create_ip>" + spbill_create_ip + "</spbill_create_ip>" formData += "<total_fee>" + total_fee + "</total_fee>" formData += "<trade_type>JSAPI</trade_type>" formData += "<sign>" + paysign({ appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type: 'JSAPI' }) + "</sign>" formData += "</xml>" let res = await rp({ url: "https://api.mch.weixin.qq.com/pay/unifiedorder", method: 'POST',body: formData}) let xml = res.toString("utf-8") if (xml.indexOf('prepay_id')<0) return xml let prepay_id = xml.split("<prepay_id>")[1].split("</prepay_id>")[0].split('[')[2].split(']')[0] let paySign = paysign({ appId: appid, nonceStr: nonce_str, package: ('prepay_id=' + prepay_id), signType: 'MD5', timeStamp: timeStamp }) return { appid, nonce_str, timeStamp, prepay_id, paySign } } package.json 代码如下： { "name": "getPay", "version": "1.0.0", "description": "", "main": "index.js", "scripts": { "test": "echo \"Error: no test specified\" && exit 1" }, "author": "youself", "license": "ISC", "dependencies": { "crypto": "^1.0.1", "request-promise": "^4.2.2" } } 最后选择：上传和部署：云端安装依赖。
