I am going to Tokyo Disneyland on May 10-12, 2017. I have already made my hotel reservation (which was also difficult to do online from the USA). I am now having difficulty buying my park tickets online via the Tokyo Disney Resort website. I am using a MasterCard (which seems to be the only kind of American credit card they accept), but the transaction still isn't being approved. I have contacted my card issuer and they've assured me that there's nothing wrong with the card on their end and the transaction should be approved. Does anyone have any input/experience with this? Should I be concerned if I am not able to buy park tickets in advance? Will tickets still be available for purchase at my hotel or the parks when I am there?