/AUTHORIZATION allow|cancel|request|request_unsubscribe [jid]

This command manages presence subscriptions: it allows you to request presence subscriptions from others on your roster, and allows you to control who receives your presence notifications.
If no JID is provided, the currently-selected buddy is used.

/authorization allow
 Allow the buddy to receive your presence updates
/authorization cancel
 Cancel the buddy's subscription to your presence updates
/authorization request
 Request a subscription to the buddy's presence updates
/authorization request_unsubscribe
 Request unsubscription from the buddy's presence updates