Tips are required on the cruise, and most purchases are directly replaced by the ship card. Therefore, the first time after boarding the ship is to bind the ship card with a credit card, or prepay a certain amount with cash. The fees (including tips from everyone bound to the ship card, and possible consumption deposits) are the same as when you check into a hotel. You pay the deposit, and settle the bill at the front desk when you leave. Any excess will be refunded or compensated.