Is this available internationally and/or with non $ US currencies?
To get started for free, sign up for an Amazon Payments seller account. You will need your legal business name, contact information, a US credit card, and a US address. After you sign up, you'll be able to use our tools to create HTML that you can copy and paste into your website code to show our button and start accepting payments.
I feel like I'm either blind, stupid, or looking at the wrong website (or all of the above).