Extensions???

Hello Everyone, I have a colleague who wants me to design a site for him. The concept is one already being used, he has a list of people who want him to provide a virtual storefront for them. The site would provide a place for vendors to input their information and products. He wants to use PayPal for the processing and payment of  products. However if a user purchases a product from multiple vendors, I am unsure how that would be worked out. I am in the very initial stages of this project and would kindly take any advice from anyone who could offer some. Is there a Coldfusion extension out there that can assist me? Marci "We are not free, separate, and independent entities, but like links in a chain, and we could not by any means be what we are without those who went before us and showed us the way." ~Thomas Mann