We would like to integrate Amazon Checkout into our Spreecommerce site.
I cannot find an extension for this, also because I am slightly confused about "Amazon FPS" vs. "Amazon Checkout" vs. "Amazon Simple Pay".
Is there a solution replicating the Paypal Express functionality for Amazon, allowing customers with an amazon account to pay via this account?
Spree integration for Amazon's new Login and Pay service is available here:
https://github.com/amzn/spree_pay_with_amazon
Amazon FPS, Checkout and Simple Pay are older services. The new platform offers all of the same features, but works more like a standard payment gateway.