Hypothetically speaking, how could I accomplish this task:
Suppose I have 2 affiliate programs set up on my site; Amazon.com and Pets.com. And let's say I want to give my visitors who shop at these stores through my links a 10% cashback bonus on their purchases.
Any help or ideas how this can be accomplished would be greatly appreciated.
There is no way to do this that I'm aware of. Once the user leaves your site, you have no way of knowing whether they made a purchase or not. Affiliate links track the number of click-throughs -- not the identities of the users. To do so would probably be considered an invasion of privacy.