小程序支付
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
官方文档
4. 拿到返回预付单信息并处理
5. 再次签名
官方文档
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"})
def get_str(self):
str_all="1234567890abcdefghjklmasdwery" # 注意 开发活动功能时, 去掉1,i,0,o
nonce_str="".join(random.sample(str_all,20))
return nonce_str
def get_order(self):
order_id=str(time.strftime("%Y%m%d%H%M%S"))
return order_id
# 处理返回预付单方法
def xml_to_dict(self,data):
import xml.etree.ElementTree as ET
xml_dict={}
data_dic=ET.fromstring(data)
for item in data_dic:
xml_dict[item.tag]=item.text
return xml_dict
# 获取sign签名方法
def get_sign(self):
data_dic = {
"nonce_str": self.nonce_str,
"out_trade_no": self.out_trade_no,
"spbill_create_ip": self.ip,
"notify_url": self.notify_url,
"openid": self.openid,
"body": self.body,
"trade_type": "JSAPI",
"appid": self.appid,
"total_fee": self.total_fee,
"mch_id": self.mch_id
}
sign_str = "&".join([f"{k}={data_dic[k]}" for k in sorted(data_dic)])
sign_str = f"{sign_str}&key={settings.pay_apikey}"
md5 = hashlib.md5()
md5.update(sign_str.encode("utf-8"))
return md5.hexdigest().upper()
# 1.生成商户订单 提供 支付统一下单 所需参数
def pay(self):
self.appid=settings.AppId
self.mch_id=settings.pay_mchid
self.nonce_str=self.get_str()
self.body="商品名" # 商品名一般由小程序端传到后端
self.out_trade_no=self.get_order()
self.total_fee=1
self.spbill_create_ip=self.ip
self.notify_url="http://www.baidu.com"
self.trade_type="JSAPI"
self.sign = self.get_sign() # 获取sign 签名
data=f\'\'\'
<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>
\'\'\'
# 2.支付统一下单
url="https://api.mch.weixin.qq.com/pay/unifiedorder"
# 3.返回预付单信息
response=requests.post(url,data.encode("utf-8"),headers={"content-type":"application/xml"})
res_data=self.xml_to_dict(response.content)
data=self.two_sign(res_data["prepay_id"])
return data
# 4.将组合数据再次签名
def two_sign(self,prepay_id):
timeStamp=str(int(time.time()))
nonceStr=self.get_str()
data_dict={
"appId":settings.AppId,
"timeStamp":timeStamp,
"nonceStr":nonceStr,
"package":f"prepay_id={prepay_id}",
"signType":"MD5"
}
sign_str = "&".join([f"{k}={data_dict[k]}" for k in sorted(data_dict)])
sign_str = f"{sign_str}&key={settings.pay_apikey}"
md5 = hashlib.md5()
md5.update(sign_str.encode("utf-8"))
sign=md5.hexdigest().upper()
data_dict["paySign"]=sign
data_dict.pop("appId")
# 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
return data_dict
项目/urls.py
url(r\'^pay/\',views.Pay.as_view())
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