I would like to start an affiliate program with one of my web sites – I would like web users to be able to register for my affiliate program and be paid for sales they send to me. I am looking for options on how to track who sent me traffic and any conversions that come from that traffic – I am wondering if Google has an API that will track this information and allow me to build an interface (or use an exiting one) where affiliates can see activity and conversion statistics… maybe payment information too. Which APIs should I be looking at? If anyone has any other suggestions other than using Google API I would be interested too... My site is currently in ASP .NET 2.0.