Custom script

We need a script to:

1.. Listing ebay products

2. Search ebay products

3. Add products - Submit an auction from our website

Using our DevID AppID, etc.

We would like to have the functionality of

http://sg.hardwarezone.com/marketplace/

It is important if an user can stay in the site for all major operations

rather than direct them to the ebay site.

PHP 4+ and MySQL will be preferred.