"Administration tools? Administration API? (I want to click Refund on my site, not your site.)" Looks like it's built on top of FPS: https://payments-sandbox.

"Administration tools? Administration API? (I want to click Refund on my site, not your site.)" Looks like it's built on top of FPS: https://payments-sandbox.amazon.com/sdui/sdui/business?sn=paynow/faq#use https://payments-sandbox.amazon.com/sdui/sdui/business?sn=pa... ... which has been available for some time: http://aws.amazon.com/fps/ http://aws.amazon.com/fps/