2017年9月19日に Play Billing Library の 1.0 がリリースされました(Android Developers Blog : Google Play Billing Library 1.0 released)。 https://developer.android.com/google/play/billing/billing_library.html https://developer.android.com/training/play-billing-library/index.html https://github.com/googlecodelabs/play-billing-codelab https://github.com/googlesamples/android-play-billing/tree/master/TrivialDrive_v2 ht