View Source ExTDLib.Object.UpdateNewChatJoinRequest (ExTDLib v0.0.4)

A user sent a join request to a chat; for bots only.

NameTypeDescription
chat_idstringChat identifier.
requestchatJoinRequestJoin request.
user_chat_idstringChat identifier of the private chat with the user.
invite_linkchatInviteLinkThe invite link, which was used to send join request; may be null.

More details on telegram's documentation.