We are looking for a way to purchase a single product from Amazon each time our subscribers choose a specific subscription tier. We will essentially be purchasing that product on behalf of our subscribers using our Amazon Business account. We want to provide this product as a promotional gift to our subscribers for choosing that subscription tier. We are hoping to incorporate this process in our app but to do so we need Amazon's purchasing API so our application can remotely move that single product to our cart and check out. We also need Amazon's shipping API to verify if Amazon can deliver the product to our subscribers as well as provide Amazon with the shipping details.
We don't know where or how to obtain these APIs so any information you could provide would be greatly appreciated.