Royal is really picky about the use of gift certificates/gift cards.
You have to book directly with Royal (after the booking is made they can transfer it to your TA for you).
You make the deposit with your credit card just like always.
Then, RIGHT THEN, you can use the gift cards/certificates to pay on your cruise.
If you have $100 cards, you can use up to 9, if you have $500 cards, same thing, up to 9 cards.
Whatever the balance is after using the cards, that cannot be paid for with cards later on. It must be paid for with your credit card before the final payment date.
The cards can NOT be used on ship.
I just got off the phone with Crown&Anchor and they passed me to 3 people, the final one a supervisor. I wrote all the details down and this is their policy as it stands Oct 1, 2023 per the supervisor of Incentives. However, if you purchase cards directly from their web page(there is not a discounted rate for them) those cards, can be used on ship, Here is a cut and paste they sent me in an email related to the conversation. "Use them towards the purchase of a cruise or for onboard credit toward the spa, gift shop, bar, specialty restaurants and more."
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Just thought I would let everyone know how fair Carnival is with their redemption policy.