i answered your question in another thread early.
but to repeat it, pin codes are mailed out to specific individuals.
if you don't receive one, you can't book with it.
pin codes allows you a certain %age of discount on the room.
annual pass holders can book a room at a discounted ap rate.
this is for the preferred and premier holders.
you need to check the hotel booking site if your dates qualify for the ap discount.
not all dates are listed for the future.
they do not come out at the beginning of the year for the rest of the year.