this really sucks. they're pushing everyone towards the widgets-only page-integrated checkout process "Login and Pay with Amazon".
the problem here is that it kills the uniformity on our site. paypal has a leave-to-login & come-back-with-token process if you need auth-only charging or physical goods. we prefer this because our UI is the same for all payment methods, including paypal, our own processor and amazon.
Look at Amazon Simple Pay. That's what we've been using in lieu of FPS for the past few years, the process is identical to PayPal with regards to the checkout experience and integration, and it doesn't seem to be discontinued (yet).
their Simple Pay guides point to FPS functions for "advanced" usage. do you auth first and capture on shipment without relying on FPS functions (or widget checkout)?
the problem here is that it kills the uniformity on our site. paypal has a leave-to-login & come-back-with-token process if you need auth-only charging or physical goods. we prefer this because our UI is the same for all payment methods, including paypal, our own processor and amazon.