API to integrate USPS, Ebay and Amazon with MS Access - repost 2 by GRINGOTANI

Specs: The user is an online merchant, selling with ebay, Amazon. The user processes data with MS Access tables, forms, macros, queries, reports... The user ships most product with USPS (USA Postal), integrating with Stamps.com as the portal to batch export/import the shipping data i.e... (Budget: $250-$750 USD, Jobs: Amazon Web Services, eBay, Windows API)