Adds a User to a specific List by its ID.
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The access token received from the authorization server in the OAuth 2.0 flow.
The ID of the List for which to add a member. The unique identifier of this List.
^[0-9]{1,19}$"1146654567674912769"
Unique identifier of this User. This is returned as a string in order to avoid complications with languages and tools that cannot handle large integers.
^[0-9]{1,19}$"2244994945"
The request has succeeded.
1An HTTP Problem Details object, as defined in IETF RFC 7807 (https://tools.ietf.org/html/rfc7807).