title: Android In app billing confirmation dialog isn't appearing
body: <p>I've implemented IAB using <a href="https://github.com/anjlab/android-inapp-billing-v3" rel="nofollow">https://github.com/anjlab/android-inapp-billing-v3</a> and test it on alpha test channel.<br>
  When start to test it, payment works well, but after certain number of payment, confirm dialog isn't appearing.<br>
  <a href="https://www.youtube.com/watch?v=Eo0182R2nO8" rel="nofollow">https://www.youtube.com/watch?v=Eo0182R2nO8</a><br>
  Please help me how to show the confirmation dialog for every purchase.</p>