@Override
    public void unsubscribedToPresence(JID unsubscriberJID, JID recipientJID) {
        cancelSubscriptionToPEPService(unsubscriberJID, recipientJID);
    }
Implements UserItemsProvider, adding PEP related items to a disco#items
result.
xmppserver/src/main/java/org/jivesoftware/openfire/pep/IQPEPHandler.java