I thought the CC was used as a deposit if you were using the DDP, but the full amount was charged out at time of reservation if you were not on the DDP?
Do they charge the full amount and then do a refund if you are on DDP? For international visitors, that would cost $$. (Double Int'l processing fee, once for charge, once for refund) And in fact for everyone that would cost $$, as you'd need to pay the CC or pay interest until the refund is done.