Ad tracking script - I think :)

I need a program that will allow me track affiliate sales made through PayPal, and will allow me to easily pay the affiliates instantly, or with manual approval. I have several pages that I sell software from, and I want to set up an affiliate program to allow others to sell my software, and get paid instantly through paypal. I would pay the affiliates 25% of each software title purchase, from anyone they refer. I would also pay them 25% on their Sub-Affiliate sales. So this needs to be 2 tiered tracking. The program also needs to be configurable for many different products, and websites. Perhaps this can be done through placing code on automatically generated affiliate pages, that places cookies on their visitors browsers, then when theses same visitors make purchases, we read the cookie to see who referred them? I will leave the method to the experts! :) I am new to this, so if you don't understand what I mean, I would have to tell you in person I guess. I don't even know the right termonology, so please bear with me! I can only pay $20 for this right now. Anyone interested, apply immediately, as this is TIME SENSITIVE. ## Deliverables 1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done. 2) Installation package that will install the software (in ready-to-run condition) on the platform(s) specified in this bid request. 3) Complete ownership and distribution copyrights to all work purchased. ## Platform Needs to be able to run on a Windows Server. Ask me for more details, as I am not yet sure what is required to make this project.