When you check-in at the port they will ask for a credit card. Your stateroom key card will be linked to the credit card. All expenses you have on board the ship like shore excursions, gratuity, drinks, dinner, shopping, etc will appear in your stateroom charges. Any onboard credit that you earn will appear as credit and will be deducted from the final bill. All charges will be billed to your credit card at the end of the cruise.
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