Need to have your own Developer ID for North America (US market).
MWS work - pull the list of orders from my Amazon account and populate the db. I have a site in which customers will authenticate themselves by entering the order ID which will be compared against the list of orders in our DB.
Frontend / UI is ready. If you are selected, you would just need to enable the API pull using your developer credentials. I will provide the Authentication Token based on your developer ID.