Customize AuctionWorx site to use chained/split PayPal

I am starting an auction website to sell used baby gear (multi-sellers), and I'm interested in using AuctionWorx software as the platform ([login to view URL]), with PayPal as the payment method. Right now payments happen like this: 1) A Seller lists a product for sale. 2) A Buyer purchases it, or wins the auction. 3) An invoice is generated from Seller to Buyer. 4) Buyer pays Seller the full price. 5) I have to invoice the Seller for my final value percentage, keep on top of whether or not they've paid me, and wait for the payment to come in. I don't want it work like that. I want to use the PayPal Adaptive Payments API in order to split or chain payments made on the website, so that every time a Buyer pays a Seller, my 10% final value fee is automatically split off and sent to me at my PayPal email address. The Seller receives the rest. More info an PayPal Adaptive Payments: [login to view URL] If I can be sure that the AuctionWorx software can be modified to work like this, and the quote is reasonable for customization, I will buy it right away and start moving forward with this project. But I need to be sure that this can be done, and get a quote for achieving it. Can you help? Here's what I expect: 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables): 3) Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment. 4) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement).