Why did ICBC swipe the credit card to pre-authorize 300 yuan in the hotel, but received a text message showing that it spent 345 yuan?

ICBC's pre-authorization business freezes 1 15% of your transaction amount, so the money in your card will be reduced by 345. When you actually check out, this 345 will be unfrozen and automatically returned to your card. In order to rationalize the credit value, pre-authorization will freeze 1 15% of the actual amount, which is really normal and will be returned automatically after the settlement is completed.