Wondering how a preregistered credit card is used when purchasing excursions. When you request an excursion and you go to your cart to pay, will all of the payment fields be filled in for you if your card is already entered into the system? I know some excursions are so popular that you must sign up and pay immediately or you will lose the space. If preregistration helps one be faster, I'm willing to use a CC that gives me no points on the purchases but at least Viking accepts. (Wish they would go ahead and find a way to allow MC to be preregistered.).