The Google Apps Marketplace billing and licensing APIs enable Marketplace applications to integrate with Google's billing services, providing customers with a consistent billing experience and centralized management of the billing for their web applications.
With the Marketplace billing and licensing APIs, users can: associate an application with a Google Checkout account to receive payments, turn some application extensions on or off to create different editions of a product, give buyers the choice of a variety of differently-priced subscription levels and more. The API uses RESTful protocol and responses are formatted in JSON.
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