Paying for Princess Cruise with Apple Card and interest charges

• Yes you can pay with the Apple Card. It is a Credit Card, used wherever Mastercard is accepted.
• Yes you would be charged interest if the balance is not paid each month.
• Princess Cruises does offer an EZPay option that spreads the charge out over several months, and there would be no interest charge by Apple as long as the monthly charge was paid.
• Apple does offer Interest Free payments for Apple purchases. I have not seen any promotion to do the same for Princess Cruise charges.

Do you mean your Apple-branded Mastercard from Gold Sachs? It's a Mastercard. If Princess accepts that and you have a sufficient credit limit, I don't see why not.

If you pay the amount off when it's due, there's no interest.

To see your Apple Card interest rate (APR), open the Wallet app on your iPhone, tap on your Apple Card, then tap the More button (the three dots) and select Account Details. Scroll down to the "Credit Details" section to find your APR.