Specifically, I'm not sure if I'll need SSL or any other security measure on my website or if Amazon handles that with the API.
My website has a simple login and a sidebar on the right side for subscription payment information. I plan on having a simple 3 forms input box to collect payments (very similar to media temple). Credit Card Number, Expiration, Security Code, Save. I'm assuming Amazon stores the credit information so I don't have to worry about that, but are there additional security measure I need to take?