微信小程序 支付简单实例及注意事项
微信小程序 支付
微信小程序的支付和微信公众号的支付是类似的,对比起来还比公众号支付简单了一些,我们只需要调用微信的统一下单接口获取prepay_id之后我们在调用微信的支付即可。
今天我们来封装一般node的支付接口!!!
调用统一下单接口我们需要知道一些信息
var bookingNo = 'davdian' + this.createNonceStr() + this.createTimeStamp() var deferred = Q.defer() var appid = config.appId var nonce_str = this.createNonceStr() var timeStamp = this.createTimeStamp() var url = "https://api.mch.weixin.qq./pay/unifiedorder" var formData = "<xml>" formData += "<appid>" + appid + "</appid>" //appid formData += "<attach>" + attach + "</attach>" //附加数据 formData += "<body>" + body + "</body>" 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>" formData += "<openid>" + openid + "</openid>" formData += "<out_trade_no>" + bookingNo + "</out_trade_no>" formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>" formData += "<total_fee>" + total_fee + "</total_fee>" formData += "<trade_type>JSAPI</trade_type>" formData += "<sign>" + this.paysignjsapi(appid, attach, body, mch_id, nonce_str, notify_url, openid, bookingNo, '61.50.221.43', total_fee, 'JSAPI') + "</sign>" formData += "</xml>" var self = this request({ url: url, method: 'POST', body: formData }, function(err, response, body) { if (!err && response.statusCode == 200) { var prepay_id = self.getXMLNodeValue('prepay_id', body.toString("utf-8")) var tmp = prepay_id.split('[') var tmp1 = tmp[2].split(']') //签名 var _paySignjs = self.paysignjs(appid, nonce_str, 'prepay_id=' + tmp1[0], 'MD5', timeStamp) var args = { appId: appid, timeStamp: timeStamp, nonceStr: nonce_str, signType: "MD5", package: tmp1[0], paySign: _paySignjs } deferred.resolve(args) } else { console.log(body) } }) return deferred.promise
这个是一个统一下单接口的代码,我们需要appid小程序公众号id,mch_id商户号id,openid小程序的唯一标实,key支付用的密码,剩下的参数都是订单的信息和价格之类的,本人require进q模块使用promise,这个因人而异,可以根据自己需要来。我们需要请求https://api.mch.weixin.qq./pay/unifiedorder接口
注意这里我们传递的formdata是一个xml而不是json
然后我们需要签名方法,这里我们需要封装两个方法,一个是签名方法调用统一下单接口会用到,另一个是调用小程序支付用到
统一下单接口sign
var ret = { 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 } var string = this.raw(ret) string = string + '&key=' + key var crypto = require('crypto') var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex') return sign.toUpperCase()
支付sign
var ret = { appId: appid, nonceStr: nonceStr, package: package, signType: signType, timeStamp: timeStamp } var string = this.raw(ret) string = string + '&key=' + key var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex') return sign.toUpperCase()
注意加密的时候我们获取的是string而不是一个json,所以我们需要吧json转换成string,代码如下
var keys = Object.keys(args) keys = keys.sort() var newArgs = {} keys.forEach(function(key) { newArgs[key] = args[key] }) var string = '' for (var k in newArgs) { string += '&' + k + '=' + newArgs[k] } string = string.substr(1) return string
统一下单接口返回的是带有prepay_id的xml,所以我们需要一个方法进行解析,代码如下
var tmp = xml.split("<" + node_name + ">") var _tmp = tmp[1].split("</" + node_name + ">") return _tmp[0]
我们只需要把这些连接到一起就是可以获取所有微信支付所需参数,代码如下
//微信小程序支付封装,暂支持md5加密,不支持sha1 / create order by jianchep 2016/11/22 / var config = require('../config/weapp.js') var Q = require("q") var request = require("request") var crypto = require('crypto') var ejs = require('ejs') var fs = require('fs') var key = config.key module.exports = { // 获取prepay_id getXMLNodeValue: function(node_name, xml) { var tmp = xml.split("<" + node_name + ">") var _tmp = tmp[1].split("</" + node_name + ">") return _tmp[0] }, // object-->string raw: function(args) { var keys = Object.keys(args) keys = keys.sort() var newArgs = {} keys.forEach(function(key) { newArgs[key] = args[key] }) var string = '' for (var k in newArgs) { string += '&' + k + '=' + newArgs[k] } string = string.substr(1) return string }, // 随机字符串产生函数 createNonceStr: function() { return Math.random().toString(36).substr(2, 15) }, // 时间戳产生函数 createTimeStamp: function() { return parseInt(new Date().getTime() / 1000) + '' }, // 支付md5加密获取sign paysignjs: function(appid, nonceStr, package, signType, timeStamp) { var ret = { appId: appid, nonceStr: nonceStr, package: package, signType: signType, timeStamp: timeStamp } var string = this.raw(ret) string = string + '&key=' + key var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex') return sign.toUpperCase() }, // 统一下单接口加密获取sign paysignjsapi: function(appid, attach, body, mch_id, nonce_str, notify_url, openid, out_trade_no, spbill_create_ip, total_fee, trade_type) { var ret = { 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 } var string = this.raw(ret) string = string + '&key=' + key var crypto = require('crypto') var sign = crypto.createHash('md5').update(string, 'utf8').digest('hex') return sign.toUpperCase() }, // 下单接口 order: function(attach, body, mch_id, openid, total_fee, notify_url) { var bookingNo = 'davdian' + this.createNonceStr() + this.createTimeStamp() var deferred = Q.defer() var appid = config.appId var nonce_str = this.createNonceStr() var timeStamp = this.createTimeStamp() var url = "https://api.mch.weixin.qq./pay/unifiedorder" var formData = "<xml>" formData += "<appid>" + appid + "</appid>" //appid formData += "<attach>" + attach + "</attach>" //附加数据 formData += "<body>" + body + "</body>" 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>" formData += "<openid>" + openid + "</openid>" formData += "<out_trade_no>" + bookingNo + "</out_trade_no>" formData += "<spbill_create_ip>61.50.221.43</spbill_create_ip>" formData += "<total_fee>" + total_fee + "</total_fee>" formData += "<trade_type>JSAPI</trade_type>" formData += "<sign>" + this.paysignjsapi(appid, attach, body, mch_id, nonce_str, notify_url, openid, bookingNo, '61.50.221.43', total_fee, 'JSAPI') + "</sign>" formData += "</xml>" var self = this request({ url: url, method: 'POST', body: formData }, function(err, response, body) { if (!err && response.statusCode == 200) { var prepay_id = self.getXMLNodeValue('prepay_id', body.toString("utf-8")) var tmp = prepay_id.split('[') var tmp1 = tmp[2].split(']') //签名 var _paySignjs = self.paysignjs(appid, nonce_str, 'prepay_id=' + tmp1[0], 'MD5', timeStamp) var args = { appId: appid, timeStamp: timeStamp, nonceStr: nonce_str, signType: "MD5", package: tmp1[0], paySign: _paySignjs } deferred.resolve(args) } else { console.log(body) } }) return deferred.promise } }
之后我们封装下单接口
unifiedorder: function (req, res) { var body = "测试支付" var openid = "openid" var total_fee = 1 var notify_url = "http://localhost/notify" var mch_id = config.shopId var attach = "测试" wxpay.order(attach, body, mch_id, openid, total_fee, notify_url) .then(function(data){ console.log('data--->', data, 123123) res.json(data) }) },
然后我们只需要在小程序里面调用这个接口,就会获取到所有的支付需要信息,再掉微信支付即可。
这里说几个小程序支付的坑
1.统一下单接口是xml(这个不只是小程序,公众号也是),返回值也是xml格式需要自己获取prepay_id,
2.签名算法要带上key,要转换成大些
3.微信支付的sign算法也要带上appid(这个不科学,深坑)
4.签名算法一定不要用json拼接key
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