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Share the example code tutorial of the mini program payment function

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May 26, 2017 am 09:45 AM

The payment of WeChat mini program is similar to the payment of WeChat official account. In comparison, it is simpler than the payment of official account. We only need to call WeChat’s unified ordering interface to obtain the prepay_id, and then we can call WeChat payment. .

Today we will encapsulate the payment interface of general node! ! !

First we need to know some information to call the unified ordering interface

var bookingNo = &#39;davdian&#39; + 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.com/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, &#39;61.50.221.43&#39;, total_fee, &#39;JSAPI&#39;) + "</sign>"  
    formData += "</xml>"  
    var self = this
    request({  
      url: url,  
      method: &#39;POST&#39;,  
      body: formData  
    }, function(err, response, body) {  
      if (!err && response.statusCode == 200) {  
        var prepay_id = self.getXMLNodeValue(&#39;prepay_id&#39;, body.toString("utf-8")) 
        var tmp = prepay_id.split(&#39;[&#39;)  
        var tmp1 = tmp[2].split(&#39;]&#39;)  
        //签名  
        var _paySignjs = self.paysignjs(appid, nonce_str, &#39;prepay_id=&#39; + tmp1[0], &#39;MD5&#39;, 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

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This is the code of a unified ordering interface. We need appid applet public account id, mch_id merchant account id, openid small The only identifier of the program is the password for payment. The remaining parameters are the order information and price. I require enter the q module and use promise. This is due to human reasons. It depends on your needs. We need to request the api.mch.weixin.qq.com/pay/unifiedorder interfaceNote: The formdata we pass here is an xml instead of

json

Then we A signature method is required. Here we need to encapsulate two methods. One is used by the signature method to call the unified ordering interface, and the other is used to call the mini program payment

unified ordering interface 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 + &#39;&key=&#39; + key  
    var crypto = require(&#39;crypto&#39;)  
    var sign = crypto.createHash(&#39;md5&#39;).update(string, &#39;utf8&#39;).digest(&#39;hex&#39;)  
    return sign.toUpperCase() 

支付sign：

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var ret = {  
        appId: appid,  
        nonceStr: nonceStr,  
        package: package,  
        signType: signType,  
        timeStamp: timeStamp  
    }  
    var string = this.raw(ret)  
    string = string + &#39;&key=&#39; + key  
    var sign = crypto.createHash(&#39;md5&#39;).update(string, &#39;utf8&#39;).digest(&#39;hex&#39;)  
    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：

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var keys = Object.keys(args)  
    keys = keys.sort()  
    var newArgs = {}  
    keys.forEach(function(key) {  
        newArgs[key] = args[key]  
    })  
    var string = &#39;&#39;  
    for (var k in newArgs) {  
        string += &#39;&&#39; + k + &#39;=&#39; + 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：

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var tmp = xml.split("<" + node_name + ">")  
    var _tmp = tmp[1].split("</" + node_name + ">")  
    return _tmp[0]  

最后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：

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//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("")  
    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 = &#39;davdian&#39; + 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.com/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, &#39;61.50.221.43&#39;, total_fee, &#39;JSAPI&#39;) + "</sign>"  
    formData += "</xml>"  
    var self = this
    request({  
      url: url,  
      method: &#39;POST&#39;,  
      body: formData  
    }, function(err, response, body) {  
      if (!err && response.statusCode == 200) {  
        var prepay_id = self.getXMLNodeValue(&#39;prepay_id&#39;, body.toString("utf-8")) 
        var tmp = prepay_id.split(&#39;[&#39;)  
        var tmp1 = tmp[2].split(&#39;]&#39;)  
        //签名  
        var _paySignjs = self.paysignjs(appid, nonce_str, &#39;prepay_id=&#39; + tmp1[0], &#39;MD5&#39;, 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：

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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(&#39;data--->&#39;, data, 123123)
        res.json(data)
      })  
  },

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Then we only need to call this interface in the mini program, and we will get all the payment information, and then we can make WeChat payment.

Here are some of the pitfalls of small program payment:

1. The unified ordering interface is xml (this is not just for small programs, but also for official accounts), and the return value is also in xml format and needs to be obtained by yourself. prepay_id,

2. The signature algorithm must bring the key, and finally it must be converted to a larger number

3. The sign algorithm of WeChat payment must also bring the appid (this is unscientific, a deep pit)

4. The signature algorithm must not use json to splice key

[Related recommendations]

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