title: Which Google Play account does IabHelper use?
body: <p>I'm implementing a shop of magazines. I need my magazines once be bought to be available at all user's devices. So, I need to synchronize information somehow. I think, it's logical to synchronize by user play market account.</p>
  
  <p>I looked through google's example implementation of in-app billing <a href="http://developer.android.com/training/in-app-billing/preparing-iab-app.html" rel="nofollow">Preparing Your In-app Billing Application</a>, and I found this implementation easy enough to do my first app with in-app billing.</p>
  
  <p>The quiestion is: which Google Play account does <code>IabHelper</code> use? For example, there're several Google accounts on device. How to specify which account should be chosen by <code>IabHelper</code>? </p>
  
  <p>How to point to <code>IabHelper</code> which account to take if there're many of them at device?</p>