Add <uses-permission android:name="com.android.vending.BILLING"/> to every layout resource in your application.

Add <uses-permission android:name="com.android.vending.BILLING"/> to AndroidManifest.xml.

Add <uses-permission android:name="com.android.billing.inapp"/> to AndroidManifext.xml

Add <uses-permission android:name="com.android.billing.inapp"/> to every layout resource in your application.

A method to control access to your paid application through authentication.

A method to provide a license key per product sold in-app.

A method to provide add license key for advertisements added to an application.

A method to add a second layer authentication to your privately hosted services.

A Google Play publisher account.

A Google Wallet merchant account.

An uploaded application draft.

A Google Play gaming services account.

A library that verifies the validity of Android SDK licenses

A collection of helper classes that simplify adding licensing to your application.

A library that verifies the validity of the device purchase.

A library that provides information about Android devices hardware info.

Monitor the workflow of your activities usage.

Understand who is using your application.

Know the number of installs of your application.

Track application errors