wx.requestPayment(
            {
              ‘timeStamp‘: res.data.data["timeStamp"],
              ‘nonceStr‘: res.data.data["nonceStr"],
              ‘package‘: res.data.data["package"],
              ‘signType‘: ‘MD5‘,
              ‘paySign‘: res.data.data["paySign"],
              ‘success‘: function (res) {
                if (res.errMsg == "requestPayment:ok") {
                  wx.showToast({
                    title: ‘支付成功‘,
                    icon: ‘success‘,
                    duration: 1000
                  })
                }
              },
              ‘fail‘: function (res) {
              },
              ‘complete‘: function (res) {
              }
            })

def wechat_pay():
    goods_price = request.args.get("price")
    openid = g.current_user.get("openId")
    appid = ""  #小程序appid,小程序-开发-开发设置里找
    mch_id = "" #微信支付商户号，微信支付|商户平台-账户中心-商户信息里找
    api_key = "" #API秘钥，微信支付|商户平台-账户中心-API安全里找
    notify_url = "" #支付成功回调路径
    orderid = datetime.datetime.now().strftime(‘%Y%m%d%H%M%S‘)  #已时间为订单号
    info = WX_PayToolUtil(appid, mch_id, api_key, notify_url)
    data = info.getPayUrl(orderid, openid, goods_price)
    return json_response(0, data=data)

# coding=utf-8
import requests
import hashlib
import xmltodict
import time
import random
import string
from random import Random


class WX_PayToolUtil():
 """ 微信支付工具 """
 def __init__(self, APP_ID, MCH_ID, API_KEY, NOTIFY_URL):
  self._APP_ID = APP_ID # 小程序ID
  self._MCH_ID = MCH_ID # # 商户号
  self._API_KEY = API_KEY # 商户秘钥
  self._UFDODER_URL = "https://api.mch.weixin.qq.com/pay/unifiedorder" # 接口链接
  self._NOTIFY_URL = NOTIFY_URL # 异步通知


 def generate_sign(self, param):
   ‘‘‘生成签名‘‘‘
   stringA = ‘‘
   ks = sorted(param.keys())# 参数按键值排序
   for k in ks:
    stringA += (k + ‘=‘ + param[k] + ‘&‘)
   # 拼接商户KEY
   stringSignTemp = stringA + "key=" + self._API_KEY
   # md5加密,也可以用其他方式
   hash_md5 = hashlib.md5(stringSignTemp.encode(‘utf8‘))
   sign = hash_md5.hexdigest().upper()
   return sign


 def random_str(self):
  """
  生成随机字符串
  :param randomlength: 字符串长度
  :return:
  """
  strs = ‘‘
  chars = ‘AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz0123456789‘
  length = len(chars) - 1
  random = Random()
  for i in range(0, 30):
   strs += chars[random.randint(0, length)]
  return strs


 def getPayUrl(self, orderid, openid, goodsPrice, **kwargs):
  """向微信支付端发出请求，获取url"""
  key = self._API_KEY
  nonce_str = self.random_str()# 生成随机字符串，小于32位
  params = {
   ‘appid‘: self._APP_ID, # 小程序ID
   ‘mch_id‘: self._MCH_ID, # 商户号
   ‘nonce_str‘: nonce_str, # 随机字符串
   "body": ‘learning card‘, # 支付说明
   ‘out_trade_no‘: orderid, # 生成的订单号
   ‘total_fee‘: str(goodsPrice), # 标价金额
   ‘spbill_create_ip‘: "", # 终端IP,你服务器IP
   ‘notify_url‘: self._NOTIFY_URL,
   ‘trade_type‘: "JSAPI", # 支付类型
   "openid": openid, # 用户id
   }
  # 生成签名
  params[‘sign‘] = self.generate_sign(params)
  param = {‘root‘: params}
  xml = xmltodict.unparse(param)
  response = requests.post(self._UFDODER_URL, data=xml.encode(‘utf-8‘), headers={‘Content-Type‘: ‘text/xml‘})
  # xml 2 dict
  msg = response.text
  xmlmsg = xmltodict.parse(msg)
  # 4. 获取prepay_id
  if xmlmsg[‘xml‘][‘return_code‘] == ‘SUCCESS‘:
    prepay_id = xmlmsg[‘xml‘][‘prepay_id‘]
    # 时间戳
    timeStamp = str(int(time.time()))
    # 5. 五个参数
    data = {
     "appId": self._APP_ID,
     "nonceStr": nonce_str,
     "package": "prepay_id=" + prepay_id,
     "signType": ‘MD5‘,
     "timeStamp": timeStamp,
    }
    # 6. paySign签名
    paySign = self.generate_sign(data)
    data["paySign"] = paySign # 加入签名
    # 7. 传给前端的签名后的参数
    return data