a question for those familiar with ecommerce:

i am working with an existing site that has about 3,000 items in its database. my boss wants to start doing online ordering for some of the products. what i am looking for (ideally) is a site/company that will handle just the order processing part. i would like to be able to just send them the item description, price, etc. and let them deal with the secure credit card transactions and reports. i looked into store.yahoo.com, but they require that the site is hosted on their servers, which may or may not work.

does such a thing exist? anyone out there doing anything similar?

thanks.