The In-App Purchasing (IAP) API allows your app to present, process, and fulfill purchases of digital content and subscriptions within your app. Amazon supports an IAP API for Android Apps and Web Apps. This page gives a high-level introduction to the IAP API.

Flurry Analytics provides an incredible amount of actionable intelligence into how and where people are using your app. You can quickly identify your most engaged and valuable users by grouping them on key characteristics such as demographics, location, language preference, and usage of select features in your app.

In-app Billing is a Google Play service that lets you sell digital content from inside your applications. You can use the service to sell a wide range of content, including downloadable content such as media files or photos, virtual content such as game levels or potions, premium services and features, and more.

Google Play offers a licensing service that lets you enforce licensing policies for applications that you publish on Google Play. With Google Play Licensing, your application can query Google Play at run time to obtain the licensing status for the current user, then allow or disallow further use as appropriate. Using the service, you can apply a flexible licensing policy on an application-by-application basis—each application can enforce licensing in the way most appropriate for it. If necessary, an application can apply custom constraints based on the licensing status obtained from Google Play. For example, an application can check the licensing status and then apply custom constraints that allow the user to run it unlicensed for a specific validity period. An application can also restrict use of the application to a specific device, in addition to any other constraints. The licensing service is a secure means of controlling access to your applications. When an application checks the licensing status, the Google Play server signs the licensing status response using a key pair that is uniquely associated with the application. Your application stores the public key in its compiled .apk file and uses it to verify the licensing status response. Any application that you publish through Google Play can use the Google Play Licensing service. No special account or registration is needed. Additionally, because the service uses no dedicated framework APIs, you can add licensing to any application that uses a minimum API level of 3 or higher.

JSON processor (JSON parser + JSON generator).