What are In-App Purchases?
Many free and paid apps offer In-App Purchases-optional transactions designed to augment an app’s functionality. You can only make In-App Purchases from an app that you’ve already downloaded.

Types of In-App Purchases
There are three types of In-App Purchases: permanent enhancements, like unlocking game levels, removing advertising, or expanding an app’s feature set; expandable purchases, such as extra lives for a game character; and auto-renewing subscriptions (such as a monthly magazine that charges every 30 days).

How In-App Purchases Work?
Auto-renewing subscriptions and permanent In-App Purchases and expendable items Purchases may be transferred to different Android devices that are authorized with your Bazaar account. For example, let’s say you download a game and pay to remove advertising (permanent) and buy extra food for your character (expendable). If you then download the game on another one of your devices, it would still be without ads and include the virtual food.