小程序支付
业务流程时序图 官方文档
步骤:
1. Openid
在小程序初次加载的时候就已经获取(详情见 小程序登录)
2. 生成商户订单
1.商品信息由小程序端提供
2.提供支付统一下单接口所需参数3. 调用支付统一下单API
4. 拿到返回预付单信息并处理
5. 再次签名
案例:
小程序端
test.wxml
<button bind:tap="pay">支付</button>
test.js
Page({ pay:function(){ wx.request({ url: "http://127.0.0.1:8000/pay/", method: "POST", data:{"login_key":wx.getStorageSync("login_key")}, header: { "content-type": "application/json" }, success: function (e) { console.log(e) // 签权调起支付 wx.requestPayment({ 'timeStamp': e.data.data.timeStamp, 'nonceStr': e.data.data.nonceStr, 'package': e.data.data.package, 'signType': e.data.data.signType, 'paySign': e.data.data.paySign, 'success': function (res) { console.log(res,"成功") }, 'fail': function (res) { console.log("支付失败",res) }, }) } }) }, })
后端 django
wx ├── settings.py # 小程序id,code2Session等配置 ├── wx_login.py # 用于调用code2Session拿到openid等 └── WXBizDataCrypt.py # 获取用户授权信息的解密算法,官方下载
wx/settings.py
AppId="..."AppSecret="..."
code2Session="https://api.weixin.qq.com/sns/jscode2session?appid=&secret=&js_code=&grant_type=authorization_code" pay_mchid ='...' pay_apikey = '...'
项目/views.py
from rest_framework.views import APIView from rest_framework.response import Response from django.core.cache import cache import hashlib,time import random from app01.wx import settings import requests class Pay(APIView): def post(self,request): param=request.data if param.get("login_key"):
#从redis中拿到小程序端login_key所对应得opendi&session_key值 openid,session_key=cache.get(param.get("login_key")).split("&") self.openid=openid # 获取用户IP # 1.如果是Nginx做的负载就要HTTP_X_FORWARDED_FOR if request.META.get('HTTP_X_FORWARDED_FOR'): self.ip =request.META['HTTP_X_FORWARDED_FOR'] else: # 2.如果没有用Nginx就用REMOTE_ADDR self.ip = request.META['REMOTE_ADDR'] # 调用 生成商户订单 方法 data = self.pay() return Response({"code":200,"msg":"ok","data":data}) else: return Response({"code":200,"msg":"缺少参数"})</span><span style="color: #0000ff;">def</span><span style="color: #000000;"> get_str(self): str_all</span>=<span style="color: #800000;">"</span><span style="color: #800000;">1234567890abcdefghjklmasdwery</span><span style="color: #800000;">" # 注意 开发活动功能时, 去掉1,i,0,o</span><span style="color: #000000;"> nonce_str</span>=<span style="color: #800000;">""</span>.join(random.sample(str_all,20<span style="color: #000000;">)) </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> nonce_str </span><span style="color: #0000ff;">def</span><span style="color: #000000;"> get_order(self): order_id</span>=str(time.strftime(<span style="color: #800000;">"</span><span style="color: #800000;">%Y%m%d%H%M%S</span><span style="color: #800000;">"</span><span style="color: #000000;">)) </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> order_id </span><span style="color: #008000;">#</span><span style="color: #008000;"> 处理返回预付单方法</span> <span style="color: #0000ff;">def</span><span style="color: #000000;"> xml_to_dict(self,data): </span><span style="color: #0000ff;">import</span><span style="color: #000000;"> xml.etree.ElementTree as ET xml_dict</span>=<span style="color: #000000;">{} data_dic</span>=<span style="color: #000000;">ET.fromstring(data) </span><span style="color: #0000ff;">for</span> item <span style="color: #0000ff;">in</span><span style="color: #000000;"> data_dic: xml_dict[item.tag]</span>=<span style="color: #000000;">item.text </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> xml_dict </span><span style="color: #008000;">#</span><span style="color: #008000;"> 获取sign签名方法</span> <span style="color: #0000ff;">def</span><span style="color: #000000;"> get_sign(self): data_dic </span>=<span style="color: #000000;"> { </span><span style="color: #800000;">"</span><span style="color: #800000;">nonce_str</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.nonce_str, </span><span style="color: #800000;">"</span><span style="color: #800000;">out_trade_no</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.out_trade_no, </span><span style="color: #800000;">"</span><span style="color: #800000;">spbill_create_ip</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.ip, </span><span style="color: #800000;">"</span><span style="color: #800000;">notify_url</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.notify_url, </span><span style="color: #800000;">"</span><span style="color: #800000;">openid</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.openid, </span><span style="color: #800000;">"</span><span style="color: #800000;">body</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.body, </span><span style="color: #800000;">"</span><span style="color: #800000;">trade_type</span><span style="color: #800000;">"</span>: <span style="color: #800000;">"</span><span style="color: #800000;">JSAPI</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800000;">"</span><span style="color: #800000;">appid</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.appid, </span><span style="color: #800000;">"</span><span style="color: #800000;">total_fee</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.total_fee, </span><span style="color: #800000;">"</span><span style="color: #800000;">mch_id</span><span style="color: #800000;">"</span><span style="color: #000000;">: self.mch_id } sign_str </span>= <span style="color: #800000;">"</span><span style="color: #800000;">&</span><span style="color: #800000;">"</span>.join([f<span style="color: #800000;">"</span><span style="color: #800000;">{k}={data_dic[k]}</span><span style="color: #800000;">"</span> <span style="color: #0000ff;">for</span> k <span style="color: #0000ff;">in</span><span style="color: #000000;"> sorted(data_dic)]) sign_str </span>= f<span style="color: #800000;">"</span><span style="color: #800000;">{sign_str}&key={settings.pay_apikey}</span><span style="color: #800000;">"</span><span style="color: #000000;"> md5 </span>=<span style="color: #000000;"> hashlib.md5() md5.update(sign_str.encode(</span><span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span><span style="color: #000000;">)) </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> md5.hexdigest().upper() </span><span style="color: #ff0000;"># 1.生成商户订单 提供 支付统一下单 所需参数</span> <span style="color: #0000ff;">def</span><span style="color: #000000;"> pay(self): self.appid</span>=<span style="color: #000000;">settings.AppId self.mch_id</span>=<span style="color: #000000;">settings.pay_mchid self.nonce_str</span>=<span style="color: #000000;">self.get_str() self.body</span>=<span style="color: #800000;">"商品名</span><span style="color: #800000;">"</span> <span style="color: #008000;">#</span><span style="color: #008000;"> 商品名一般由小程序端传到后端</span> self.out_trade_no=<span style="color: #000000;">self.get_order() self.total_fee</span>=1<span style="color: #000000;"> self.spbill_create_ip</span>=<span style="color: #000000;">self.ip self.notify_url</span>=<span style="color: #800000;">"</span><span style="color: #800000;">http://www.baidu.com</span><span style="color: #800000;">"</span><span style="color: #000000;"> self.trade_type</span>=<span style="color: #800000;">"</span><span style="color: #800000;">JSAPI</span><span style="color: #800000;">"</span><span style="color: #000000;"> self.sign </span>= self.get_sign() <span style="color: #008000;">#</span><span style="color: #008000;"> 获取sign 签名</span> data=f<span style="color: #800000;">'''</span><span style="color: #800000;"> <xml> <appid>{self.appid}</appid> <body>{ self.body}</body> <mch_id>{self.mch_id}</mch_id> <nonce_str>{self.nonce_str}</nonce_str> <notify_url>{self.notify_url}</notify_url> <openid>{self.openid}</openid> <out_trade_no>{self.out_trade_no}</out_trade_no> <spbill_create_ip>{self.spbill_create_ip}</spbill_create_ip> <total_fee>{self.total_fee}</total_fee> <trade_type>{self.trade_type}</trade_type> <sign>{self.sign}</sign> </xml> </span><span style="color: #800000;">'''</span> <span style="color: #ff0000;"># 2.支付统一下单</span> url=<span style="color: #800000;">"</span><span style="color: #800000;">https://api.mch.weixin.qq.com/pay/unifiedorder</span><span style="color: #800000;">"</span> <span style="color: #ff0000;"># 3.返回预付单信息</span> response=requests.post(url,data.encode(<span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span>),headers={<span style="color: #800000;">"</span><span style="color: #800000;">content-type</span><span style="color: #800000;">"</span>:<span style="color: #800000;">"</span><span style="color: #800000;">application/xml</span><span style="color: #800000;">"</span><span style="color: #000000;">}) res_data</span>=<span style="color: #000000;">self.xml_to_dict(response.content) data</span>=self.two_sign(res_data[<span style="color: #800000;">"</span><span style="color: #800000;">prepay_id</span><span style="color: #800000;">"</span><span style="color: #000000;">]) </span><span style="color: #0000ff;">return</span><span style="color: #000000;"> data </span><span style="color: #ff0000;"># 4.将组合数据再次签名</span> <span style="color: #0000ff;">def</span><span style="color: #000000;"> two_sign(self,prepay_id): timeStamp</span>=<span style="color: #000000;">str(int(time.time())) nonceStr</span>=<span style="color: #000000;">self.get_str() data_dict</span>=<span style="color: #000000;">{ </span><span style="color: #800000;">"</span><span style="color: #800000;">appId</span><span style="color: #800000;">"</span><span style="color: #000000;">:settings.AppId, </span><span style="color: #800000;">"</span><span style="color: #800000;">timeStamp</span><span style="color: #800000;">"</span><span style="color: #000000;">:timeStamp, </span><span style="color: #800000;">"</span><span style="color: #800000;">nonceStr</span><span style="color: #800000;">"</span><span style="color: #000000;">:nonceStr, </span><span style="color: #800000;">"</span><span style="color: #800000;">package</span><span style="color: #800000;">"</span>:f<span style="color: #800000;">"</span><span style="color: #800000;">prepay_id={prepay_id}</span><span style="color: #800000;">"</span><span style="color: #000000;">, </span><span style="color: #800000;">"</span><span style="color: #800000;">signType</span><span style="color: #800000;">"</span>:<span style="color: #800000;">"</span><span style="color: #800000;">MD5</span><span style="color: #800000;">"</span><span style="color: #000000;"> } sign_str </span>= <span style="color: #800000;">"</span><span style="color: #800000;">&</span><span style="color: #800000;">"</span>.join([f<span style="color: #800000;">"</span><span style="color: #800000;">{k}={data_dict[k]}</span><span style="color: #800000;">"</span> <span style="color: #0000ff;">for</span> k <span style="color: #0000ff;">in</span><span style="color: #000000;"> sorted(data_dict)]) sign_str </span>= f<span style="color: #800000;">"</span><span style="color: #800000;">{sign_str}&key={settings.pay_apikey}</span><span style="color: #800000;">"</span><span style="color: #000000;"> md5 </span>=<span style="color: #000000;"> hashlib.md5() md5.update(sign_str.encode(</span><span style="color: #800000;">"</span><span style="color: #800000;">utf-8</span><span style="color: #800000;">"</span><span style="color: #000000;">)) sign</span>=<span style="color: #000000;">md5.hexdigest().upper() data_dict[</span><span style="color: #800000;">"</span><span style="color: #800000;">paySign</span><span style="color: #800000;">"</span>]=<span style="color: #000000;">sign data_dict.pop(</span><span style="color: #800000;">"</span><span style="color: #800000;">appId</span><span style="color: #800000;">"</span><span style="color: #000000;">) </span><span style="color: #ff0000;"># 5.返回支付参数到小程序端,小程序端获取所需参数向微信服务器发送 调起支付 方法</span> <span style="color: #0000ff;">return</span> data_dict</pre>
项目/urls.py
url(r'^pay/',views.Pay.as_view())