Guests sailing on Princess’ Medallion-class ships will be able to use the wrist device to make purchases at selected retail locations in Cabo San Lucas, Saint Thomas, Puerto Vallarta and all Alaskan ports of call.
They will also receive 7% back on any purchases made as onboard ship credit.
When making a purchase with participating retail locations, merchants securely confirm the transaction with two-factor authentication that exceeds typical credit card transaction.
John Padgett, president of Princess Cruises, said MedallionPay "offers the ultimate in payment convenience and security" for guests.
"What makes MedallionPay extra special is the instant onboard value it delivers to guests in addition to base benefits with their associated credit card," he added.