First, you can only apply one discount. What most of us do is use the discount code APH to see if any AP rates are available. If you don't see any, then they are not available. You do not need the actual AP until you check in. And, the APs are good 1 year from date of activation, so since I bought mine last August, it expires this August. Cheaper to renew.
Best way to get the AP room discount is for one in your party to have it, and be the one reserving the room. I even showed my online purchase receipt for the AP, and they never did ask the rest of my trip. I activated the day I checked in, but had bought it a few weeks before our trip.
The AP rate usually doesn't come out until some time before you want to use it. Best to keep checking though, as sometimes the AP rooms come and go, as there is a limited number of rooms with that discount. The best thing to do is use whatever discount you have, then if you see a better rate, call the hotel and change. I found both the RPH and PBH to be very nice in changing rates for my reservations. The past few years, there's been a stay more, save more rate. The discount for more than 3 nights is a decent discount. It may be available next year too, so always check the hotels for any discounts.
Love October, as its
HHN, a great scary adult separate party that so far, has been almost always in the Studios.