为啥一直提示缺少参数呢

https://api.weixin.qq.com/wxa/getpaidunionid?access_token=py_dBwlcz5f3cRT3uABK16PzgJbVMcHmW_dgS7jVKcYXWUHirRC_AvUqvAZVwtDHLeABAOSW&openid=o7wB95fVNgecVR9J7uOCXYLZ5--Q

{“errcode”:40101,“errmsg”:“missing parameter hint: [g.oCMbMre-N1]”}