We run our eCommerce site on Volusion. We also have a dedicated Windows Server running SQL Server 2005 that we use for reporting (admin site.) We need the admin site's product information automatically updated using Volusion's API. We also want to push Stock Status information from the admin site back to Volusion so that our Stock information is up-to-date daily.
Volusion's API information can be found here: http://devwiki.volusion.com/index.php/Main_Page