The Application Billing Page
After customers have used the product, they can view their usage and corresponding costs on the Application Billing page (at http://www.amazon.com/dp-applications). This page is available at any time and shows usage and billing information for all the DevPay products they use. You should provide a link to this page on your web site.
The following image shows an example Application Billing page for a customer who has purchased paid AMIs.
The next image shows an example Application Billing page for a customer who has purchased products based on Amazon S3.