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Hi Twain, Could you please clarify your query a little? To implement Amazon IAP in your app, you do not have to bind your app to any service. Your app would communicate the app store client through Amazon IAP SDK library for every IAP calls. Basically you have two components in Amazon IAP, i.e PurchasingManager (to make high level call like getItemDetails, initiatePurchaseItem, initiatePurchaseUpdateRequests etc) and an observer to get back the callbacks for the calls being made to PurchasingManager. I do not think the pattern is similar as Google's Google's in-app API v3. You should find the implementation details here : https://developer.amazon.com/sdk/in-app-purchasing.html Thank you for writing to us.

My point is, 1) Google is the dominant store and 2) I have to write separate code for Amazon IAP. However, since Google used this stub / service interface, and all the in-app billing code is accessed through a service binding, Amazon could have made it so that us developers require no change in code - provide that same binding. Instead, we're forced to write Amazon IAP code.

Hi Twain, Unfortunately, yes. You have to integrate Amazon IAP in your app and make the required changes in your project.