Affiliate script for Pixel Site

Hello, I will get straight to what is needed. I am starting a pixel site. I need this: There is a free page and a premium page(where members pay) and I want the script integrated only in those. What I am trying to do is have a sort of affiliate program on my site, where members can sign up to. I want to pay them commissions on 3 levels deep. (excluding their level ofcourse). I need to record SALES ONLY, and credit it do them(if they lead the new sale to my site). So basially record their commission only after the pixel(s) is/are sold. I also want it to be a self replicated site of mine(search engine friendly).If possible. I also would like a geneology tree, where each member can see who they referred and the commissions made on each level.. I just need to integrate a simple script, with a cutomisable header and footer. That is all! I need it as soon as possible though. Thanks!