I recently asked this on another thread and someone called and was told that you can no longer buy APs at the Orlando airport Disney stores, or any other Disney stores. They said the only place you can buy them now are at the parks or ordering on the phone or online. If you're using it for an AP rate, you can use a voucher to check-in, it doesn't have to be an activated AP. If they really want to be sure you're not scamming, they'll ask you to stop by the front desk before you check out to show your AP if you only had a voucher at check-in. I have never been asked for my AP for a room rate though, so it may not even be an issue.