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Amazon says that the Kindle Fire is its bestselling product.

In a move to attract developers to its app store, Amazon today debuted a tool that allows in-app purchases of physical and digital items with the potential for developers to make some extra dough in the process.

Called Mobile Associates API, developers building apps for the Kindle Fire and other Android devices can earn up to six percent from Amazon purchases made by customers when using their app.The program is an extension of Amazon’s Affiliates Program, which allows people to post advertisements and links to Amazon products on their websites for percentage of the sales.

For example, say you developed a golf instruction app. Now you can embed in-app purchases of golf-related products on Amazon, and if a user makes a purchase, you get a cut.

“Developers now have the ability to create an even deeper connection between their app and the products customers value and purchase through,” Mike George, Vice President of Amazon Appstore, Games and Cloud Drive, said in a press release.

One app, Thor: Lord of Stormsis already taking advantage of the new program by selling Thor hammer and action figures within its app.

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