Both, depending on the promotion. The current pin code seems to have been done by postcard (snail mail) in the past two weeks from the posts I've read. However, in 2005 we received an e-mail pin, which we used, and then presented a copy of teh e-mail at check-in. Also, this Spring we got a free upgrade at OKW or SSR and it was through e-mail. We also used it. There is nothing better than finding an email in your box fro Disney Destinations with the heading, "Surprise_______ family," and then goes on to tell you about the offer.