Amazon allow 3rd party apps to work on behalf of their marketplace sellers e.g. (feedback express). I need an app that will connect to my marketplace account and download all previous orders. It will need to then allow me to select multiple orders and then
1) refund the order
2) send an marketplace message from a template using order information and importantly add a local pdf based on predefined filename/location.
This has to work for many order (up to 1000 at a time).
Please in your bid briefly outline how you would achieve this task and what you would require. Please also outline any similar projects you have done.