title: Time trial for one-time purchases with Google Play In-App Billing
body: <p>Currently, I have a free to download app with limited features. In order to unlock full features, user will need to go through one-time purchase, with Google Play In-App Billing.</p>
  
  <p>Recently, to increase conversion rate, I plan to offer time-trial full features.</p>
  
  <p>That's mean, user able to use the full features for first 7 days, without having to perform one-time purchase.</p>
  
  <p>After 7 days, he will fall back to app with limited features. If he likes the full features in the last 7 days, he will perform one-time purchase. If not, he will just let it be :)</p>
  
  <p>I was wondering, is there any way I can utilize existing in-app purchase billing API, to achieve my time-trial feature?</p>
  
  <p>I prefer not to handle server side by my own, if that's possible.</p>
  
  <p>I know in-app subscription model does offer trial period : <a href="http://developer.android.com/google/play/billing/billing_subscriptions.html" rel="noreferrer">http://developer.android.com/google/play/billing/billing_subscriptions.html</a></p>
  
  <p>However, subscription model is not what I'm looking for. Mine belongs to <a href="http://developer.android.com/google/play/billing/api.html#consumetypes" rel="noreferrer">Non-consumable Items</a></p>