code: def approve(self, peer_jid):
          
          self.client.enqueue(
              stanza.Presence(type_=structs.PresenceType.SUBSCRIBED,
                              to=peer_jid)
          )
docs: (Pre-)approve a subscription request from `peer_jid`.
  
          :param peer_jid: The peer to (pre-)approve.
  
          This sends a ``"subscribed"`` presence to the peer; if the peer has
          previously asked for a subscription, this will seal the deal and create
          the subscription.
  
          If the peer has not requested a subscription (yet), it is marked as
          pre-approved by the server. A future subscription request by the peer
          will then be confirmed by the server automatically.
  
          .. note::
  
              Pre-approval is an OPTIONAL feature in :rfc:`6121`. It is announced
              as a stream feature.