title: Does in-app billing require Google Play services to be installed on the user's device?
body: <p>The <a href="https://developer.android.com/google/play/billing/billing_integrate.html" rel="nofollow">setup docs</a> for in-app billing show you need to add the in-app billing library to your Android project. Presumably that calls Google Play's servers to query and make in-app purchases on your app's behalf.</p>
  
  <p>The <a href="https://developers.google.com/android/guides/setup" rel="nofollow">setup docs</a> for using Google Play APIs don't mention in-app billing; whereas you would have to add a dependency on Google Play if you wanted to display ads or use Google Analytics for example.</p>
  
  <p>So, taking these 2 pieces of info together, does this mean your app does <em>not</em> need Google Play services to be present on the user's device for your app to use in-app billing successfully? I suspect the answer's "No, you don't need Google Play services to be installed", but it would be good to have confirmation of this.</p>