Not only earning from affiliate payouts but also adding a 'service fee' . what i mean is let's say you are running a travel related affiliate program . A normal payout from an affiliate program would be less than 2%. It really doesn't worth the try. But if i manage to find a way ( i don't know how technically i will achieve that )BEFORE the customer proceeds with the booking with the affiliate site to pay me an extra fee let's say 20 $ that would be fine .Has anybody any experience how customers face it? Is there any illegal aspect? Has anybody achieved that technically? any thoughts appreciated.