curl --location -g --request POST 'http://gitlab.example.com/v3/groups//members' \
--data-urlencode 'user_id=' \
--data-urlencode 'access_level=' \
--data-urlencode 'expires_at='{
"name": "string",
"username": "string",
"id": "string",
"state": "string",
"avatar_url": "string",
"web_url": "string",
"access_level": "string",
"expires_at": "string"
}