Help! We are trying to book a 2-night/3-day package at Hilton Tokyo Bay for our visit in mid-May. DH's birth mother (who lives in South Korea) has offered to pay for that stay, so I am trying to use her credit card to book it. Only problem is, it keeps sending me to this 3D-secure authentication site. I have sent a message to MIL, trying to find out if she knows about it, but she just said she doesn't know (she doesn't speak much English). So how do we fill out this authentication page, it's asking for a resident registration number??? Has anyone else dealt with this? Thanks for your help!