"miniprogram":{
   "appid":"appid",
   "pagepath":"pages/index/index"
 },
使用‘pagepath’报错；invalid weapp pagepath rid: 63326ec4-08cca9d7-634ad24b

将‘pagepath’改为‘path’可以正常发送；
 "miniprogram":{
   "appid":"appid",
   "path":"pages/index/index"
 },
{
  "errcode" : "0",
  "errmsg" :"ok"
  "msgid": "2594721303665115139"
}

https://developers.weixin.qq.com/doc/offiaccount/Message_Management/Template_Message_Interface.html