title: GTM OAuth does not download Refresh Token - iOS
body: <p>I am using Google's GTMOAuth for iOS/Mac SDK in order to be able to connect with APIS such as YouTube API and Instagram API. It all works fine, however when the user authenticates, I can only get access token. This is all well and good, but after a while the access tokens expire and the user has to re-login which is awful. </p>
  
  <p>My problem is that when the user authenticates, I ONLY GET back an access token and nothing else...</p>
  
  <p>Thanks for you're help :)</p>