Amazon’s in-app purchase API is still in its beta phase, but it can be operational anytime soon. Developers will get about 70 percent of the asking price, but Amazon still hold the right to mingle with the price users get charged.
Amazon will control the price of the contents as it does for its applications, contrary to the other app stores that allow developers to set the final tag for their app. So, if Amazon changes the price of an app, the developer will get about 70 percentage of the asked price. For in-app purchase, the developers are guaranteed to get 70 percentage of the suggested retail price, even if amazon changes the label.
Amazon wanted to enjoy some flexibility, so that it could offer some promotional discounts and bundled purchases, something that Google and Apple will take ages to implement.
Amazon’s Android based flagship tablet, Kindle fire, is confined into Amazon’s own app store and was feeling lack of some in-app purchase solution until now.