title: How do I access other users calendars with google calendar v3?
body: <p>I am using the Google Calendar (v3) API, with google apps and am wanting to use a single oauth2 credential to determine what users are free/busy at any given point.</p>
  
  <p>I am wanting to use this:
  <a href="https://developers.google.com/google-apps/calendar/v3/reference/freebusy/query" rel="noreferrer">https://developers.google.com/google-apps/calendar/v3/reference/freebusy/query</a></p>
  
  <p>But to use this I need to get all the calendar ids for all the users. I cannot do this as the java client for the google calendar can only retrieve calendars of the user who owns the credential. </p>
  
  <p>Note: I have access to all the users through the provisioning api. </p>
  
  <p>Any help would be much appreciated as I am totally blocked by this.</p>