The Appstore SDK supports apps targeting Fire TV, Fire tablets, and third-party devices where Amazon apps can be installed. The Appstore SDK provides functionality for handling Digital Rights Management (DRM), In-App Purchasing (IAP), and Simple Sign-in (SSI) within your Java Android apps. Video Skills Kit (VSK) for Fire TV and Echo Show.Tip: If you are porting an existing Android app, the Amazon Appstore has a list of popular SDKs that are compatible with Fire OS.