If they aren't using AdultScripting's new CCBill Webmaster Affiliate Admin, or something custom already...they should DEFINITELY take a look at it.
http://www.adultscripting.com/
I've got it set up for my Relaunch of InsomniacCash, another CCBill program to add to this list. Should be another week or so!
http://www.insomniaccash.com