Just wanted to laugh at the title of this thread "WDW will NOT accept "codes" if you do not have the postcard" which is hilarious. It's been a while since i've found such a boldly false statement posted on the boards and just got a laugh when i stumbled across this thread.
I've got no postcard, no PIN, but i DO have 40% off for AKL in December, thereforeby making the title of the thread FALSE. LOL
Last 2 trips i've received a discount i've NEVER been asked for the postcard or any type of code that i used to make the reservation.