调用地址：

https://api.mch.weixin.qq.com/v3/pay/transactions/jsapi

输入参数：

{

  "mchid": "1613091498",

  "out_trade_no": "dsfs",

  "appid": "wx320aa0ea4b542458",

  "description": "友动体育账户充值",

  "notify_url": "https://mail.163.com/",

  "amount": {

    "total": 50,

    "currency": "CNY"

  },

  "payer": {

    "openid": "oCZ8Q44cxRSjanSwkyC-hju-OkRo"

  }

}

异常信息：

The remote server returned an error: (400) Bad Request.