Get notified about changes in a google calendar
<p>I was wondering, is it possible to set up a Mac OS X app, to get notified when a user makes changes to a Google Calendar. Like what you can do with <strong>EKEventStore</strong>?</p>

<p>There’s a query method <code>+ (id)queryForCalendarListWatchWithObject:(GTLCalendarChannel *)</code> object, but I’m not really sure how you should set up the <code>GTLCalendarChannel</code> object.</p>

<p>Or is the only way, other than polling, to use push notifications?</p>

<p>Thanks in advance.</p>