title: How to recoginize trial user?
body: <p>I'm trying to use android subscription system.
  And I think setting up 7days trial.</p>
  
  <p>I would like to summarize trial users and paid users separately.
  I assume that my android app gets subscription status(trial/paid) from google play, then send it to my aggregation server.</p>
  
  <p>But I couldn't find the way to discriminate the status with my client app.</p>
  
  <p>How can I get it?</p>