Identifier of the user, changing the rights.
Chat identifier.
Point in time (Unix timestamp) when the user rights were changed.
If user has joined the chat using an invite link, the invite link; may be null.
New chat member.
Previous chat member.
Optional
via_True, if the user has joined the chat using an invite link for a chat folder.
Optional
via_True, if the user has joined the chat after sending a join request and being approved by an administrator.
User rights changed in a chat; for bots only. Subtype of Update.