Does anyone know of a script that will let me setup say 2 or 3 products for sale on a site (each one has a different site) but manage them through a single payment system?

So for example..

Product1.com
Product2.com
Product3.com

Each time an 'order' is made to any or all of the above products the cart script will report the sale into a central database instead of three individual databases?

Does that make sense? LOL

Regards,

Lee