We recently released manage Lists, a Twitter API v2 endpoint that has similar functionality to this one. The new version is currently in development and serves adequate access for the majority of developers on our platform. While elevated levels of access are coming soon, developers in need of higher levels of access should continue to use this endpoint along with the Twitter API v2 version.
Add a member to a list. The authenticated user must own the list to be able to add members to it. Note that lists cannot have more than 5,000 members.
|list_id||required||The numerical id of the list.|
|slug||required||You can identify a list by its slug instead of its numerical id. If you decide to do so, note that you'll also have to specify the list owner using the owner_id or owner_screen_name parameters.|
|user_id||required||The ID of the user for whom to return results. Helpful for disambiguating when a valid user ID is also a valid screen name.|
|screen_name||required||The screen name of the user for whom to return results. Helpful for disambiguating when a valid screen name is also a user ID.|
|owner_screen_name||optional||The screen name of the user who owns the list being requested by a slug.|
|owner_id||optional||The user ID of the user who owns the list being requested by a slug.|