Google Play's billing system

Processing in-app purchases with Google Play Billing Library

Google Turns Off Play Store Billing in Russia - iClarified

Google Play 'user choice billing' pilot expands to India

Google Play's billing system: Update

Google Play Billing Library 5.0 overview: new subscription model

India orders Google Play Store to allow developers to use third party billing systems, not impose disproportionate fees, and more

Google to pay $90 million to settle legal fight with app developers

Apps and payments: What is the controversy about Google Play Billing System

google billing system: Google asks Indian app developers to deploy one of three billing options within two weeks - The Economic Times