I just booked 4 nights room-only in a GV CL room at Polynesian. I put the deposit on my Disney Visa and then the balance isn't due until I check in. I think if I pay the balance then I will not receive the 6 months interest free (so probably better off using AMEX for Membership Rewards). However, if I pay the balance otf before I go via the website would I get the 6 months interest free?