Add a user friends without verification.
Request to join a supergroup
Request to join a group
Custom system notification
Delete a friend
Unsend a message
Approve a friend request
Decline a request
Reject a request to join a supergroup
Reject an invitation to join a supergroup.
Reject a request to join a group
Reject a request to join a group
Invite a user to join a supergroup
Invite a user to join a group
Add a user friends without verification.
Note: The peer does not need to confirm the friend request, and directly becomes the friend of the currently logged-in user.