At the time I originally heard about the code from visitflorida.com/share, I was unsure if it was 1 code/person or 1 code/purchase. It is one code/purchase, so I ended up with 1 code too many. I gave one to a cousin & had one left. Didn't think anything about it until I saw the $49 sale from Southwest. Went to the SW site, put the extra code in & tah dah 3 flights for about $103 per person, including taxes!
SW will give you a credit when you change or cancel flights (not sure if it is all flights). I actually had to cancel & rebook because of the code. There isn't a way to enter a new code when you are changing a reservation. There was no charge, but if you did early bird check-in, you loose that money when you cancel. I am not sure if you lose it when you only change. So, I have a $258 credit with Southwest. To me, I saved $258. I don't really mind not having the cash in hand since I know I'll be using it. Kind of like a future WDW trip savings account
On visitflorida.com/share, you send an ecard to someone & SW sends a promo code. I can't remember if the code comes to you or the person you sent the card to. It takes about 2 weeks for the whole ecard/SW process to happen. I sent one to myself, one to my husband & one to my son.