Amazon Payments is a payment plugin for TheCartPress, eCommerce professional plugin for WordPress. This plugin supports Amazon FPS (Amazon Flexible Payments Service).
Amazon Payments offers services that help you improve conversion and gain new, valuable customers by making it easy for millions of Amazon customers to buy from your website. Customers can use the shipping addresses and payment information stored in their Amazon.com accounts to complete purchases. Choose the Amazon Payments service that is right for your business.
To install the plugin you need to download it from your extend.thecartpress.com account and upload to your server as any other WordPress plugin (wp-content/plugins).
After you have activate it, using plugins menu, you can configure the payment using TCP Settings/Payment Methods menu.
The next image show how to set up Amazon FPS payments: