how do you get pins and what are they?
PINs are randomly mailed/emailed codes that are specific to YOU only. There is no rhyme or reason as to who gets them, but people to think if you sign up for the planning dvd & at the website for emails you are at a better shot of getting one (in part because then Disney has your info).
The actual PIN is a 16 digit number that you call into Disney, or have your
travel agent call about, and have that discount applied (you can't book online with a PIN). It is only good for you (meaning it is non-transferable), but you can book up to 3 rooms with the PIN, provided you are all traveling together (in other words, your friends/family can join you during the trip... not go to WDW 2 mos later after you have come home).
They often have deals like % off room rates,
free dining, kids stay-play-dine for free (one we had for our trip this past year), adults for the kids' price, etc. The postcard/email usually has a description, and often has specific dates it is valid for, and definitely has a "book by" date. Even if your dates are not listed, call and see if you can use it for dates you do want... sometimes it is valid outside of the dates on the card.
Oh, and the emails come from "disney destinations" so be aware of that, watch for them possibly in your spam, and don't ever delete without reading first

!