Of course, this was over two years ago, but I just received an email that said I had 488 Fast Break Points, which surprised me, so I logged into the website to look at my activity, and in addition to a pretty expensive regular rental ($275 or so), I had two Priceline rentals from 3/00 and 4/00 that earned Fast Break Points. I can only figure that I picked up the rentals with the credit card in my profile and their system took it from there (which is similar to what happens when you pick up from Hertz with a card in your profile, it automatically throws in your Hertz number and the rentals count towards 5* and PC).

Of course, since this experience was over two years ago, things may have changed too ...