Data extraction from e commerce and auction sites

Stand alone package that pulls sales data from a number of sites ebay, amazon , zencart etc, and places the data into a current stock control management system (bespoke). We currently have a number of business's running on Ebay, Amazon and a few shopping cart sites. We want to be able to do the following: Current bespoke software written in sql and php. 1: Access these sites for sold items/products and then take the data and delete the product from our main bespoke stock system 2: Alter the search time for extracting the data ie every 30mins/1hr/6hrs/24hrs. 3: Ability to ADD extra sales e-commerce sites when necessary.