You sell stuff for them and they pay you a commission. The commissions are MUCH LOWER than for Clickbank products though, if that's what you're used to. You can choose a fixed commission schedule or tiered one... you can find all the details at the associates site. Good luck!
commissions for retail products always lower then service, ebooks etc... remember you don't need to print\ship\etc a ebook, it's already there... compare to others affiliate program they ok, they pay up to 8.50% the bad thing is the one day cookie which is sucks, however they're trust company and got good prices so nothing is perfect.
I just joined myself and I found a good source of books from mixed sites - and I just replaced my tag ID within the link - will this work as I tested and I do not see it on the report