I booked a Royal Caribbean cruise for 2024 through Costco Travel. Now I want to make a partial payment using American Express because of a promo offer by Amex, however Costco only takes Visa and Mastercard. Has anyone encountered this kind of issue before? Would Costco Travel be able to call Royal Caribbean to make a payment using Amex? This is the first time I've booked through Costco Travel before, so I don't know how flexible they are. I was able to using any credit card with my travel agent before.
