Looking for a WP friendly affilate rep plugin..

[alpine1]

I'm looking for a plugin that will enable me to have affiliate reps to sell and set up accounts for clients for my web service. It would be where the system would auto generate a affiliate number when they sign up on the site as an affiliate. It there a free one that will work to start up with WP? I know of wishlist member and others- but those are more for membership sites. Where this is more for affiliates only.
Thanks

[Dan Nickerson]

I do everything on Clickbank, so I don't have any recommended affiliate plugins.

The more important question is how do you want to handle payments.. that options up more options.