Affiliate Advertising URL's with credit rewards

I would like to give specific URL's to my webstore out to affiliate websites that display our link, and create some rules for any orders that result from a customer visiting the site through that link that will assign some credit to that affiliates account.

So for example

For Affiliate1, i create the URL http://www.website.com/uniquetoken and pass it off to them to list on their site. Lets say i create a rule that says Affiliate1 gets 1% of each transaction completed as a result of visiting the site through that link.

Then any time a customer visits our site through that link, my webstore recognizes the uniquetoken as belonging to Affiliate1, and if the visit through that link results in a sale, a $ credit gets applied to Affiliate1's record in the system.