What does it mean to buy Amazon gift card prepayment with CCB credit card?

Credit card prepayment is to freeze a part of the credit line first, and then settle the deduction with the bank after the transaction is successful. Mostly used for hotel reservation, car rental and online payment. You buy gift cards on Amazon and pay with CCB credit card. At this time, the bank will freeze part of your quota. After the merchant confirms that the transaction is successful, it will deduct money from the bank settlement, and then you will receive a message that the advance payment is successful. After the general advance payment, the transaction is directly deducted. If you only pay a deposit, such as staying in a hotel or renting a car, you need a certain amount of advance payment as a deposit. After the transaction is completed, either deduct the money from the advance payment or make another payment, and then cancel the advance payment. If the merchant does not cancel, the domestic transaction will be cancelled automatically after 30 days, and the overseas transaction will be cancelled automatically after 15 days. Specifically, you should pay attention to the subsequent bill details and amount.