1.) If you haven’t already, download the Amazon Underground app on your Android device. You will be asked to open a web page through one of your browsers to download the Amazon Underground app. After opening the link in your browser, download the Amazon Underground app. Make sure to enable “Unknown Sources” during the installation process, if needed.
2.) Purchase Amazon Coins at a discount on your primary Amazon account.
3.) Once you sign into the Amazon app, your purchased Amazon Coins will be available for use.
4.) Purchase apps, games or in-app items with your Amazon Coins.
5.) Start playing!