from the Disney Visa website:
Receive 20% off a non-discounted massage or facial service aboard Disney Cruise Line ships. Available on port days only when you use your Disney Visa Card.
and then the fine print at the bottom:
Spa Savings Onboard Disney Cruise Line
20% off select spa treatments and services. Offer and offer elements are subject to availability, capacity limitations, cruise cancellations, and additional restrictions, may change or be canceled without notice, and are not guaranteed. Valid for non-discounted massages or facial treatments on port days only. In order to receive special Disney Cruise Line perks, valid Disney Visa Card must be designated for all onboard purchases at time of purchase for sailings through 12/31/23. Reservations may be required. Cannot be combined with any other offers or discounts including Cast Member, Castaway Club, and Disney Vacation Club® offers or discounts, and is for personal use only. Ships’ Registry: The Bahamas. Chase is not responsible or liable for fulfillment of this offer.