title: Restoring consumable purchases
body: <p>I use consumable purchases (user may buy one item many times, in my app it convert to digital good) and need ability to restore purchases in future.</p>
  
  <p>I think, there is only way to do this is save user email on server side and when I need to restore purchases, I request user autorization thru Google Play Services, send email to server and restore all data.</p>
  
  <p>It is possible to get user email by which the user makes a purchase after purchase flow?</p>
  
  <p>Or, it may be, there is another method for restoring consumable purchases?</p>
  
  <p>Authorization in the application is not desirable, even though it would solve all problems!</p>