We were at Disney last week and went to the HDD on the DxDP. I'm new to all this, so only know what we experienced. I was told when I booked the HDD ADR that we had to pay in full with a CC even though we were doing the DxDP, and that our CC would be credited back once we arrived and presented our dining plan. This is what happened. When we arrived at the HDD and checked in, we went to the ticket window and the gal there took the credits from our DP and credited our CC with a full refund. She was, however, surprised our resort didn't do the refund when we picked up our HDD tickets from them.