Pre-authorization is mainly used for hotel and car rental booking and check-in, which can be simply understood as the concept of "deposit". Pre-authorization only takes up the quota, and merchants can't ask the bank for money without pre-authorization transaction confirmation.

Generally speaking, when you stay in a hotel, the hotel estimates the consumption amount in advance according to the number of days of stay and the hotel deposit, and requires you to swipe your credit card for "pre-authorization", that is, the deposit. If the hotel cashier swiped 1200 yuan, in fact, the money is still on your card and has not been paid to the hotel, but the amount has been frozen; When checking out, the hotel will destroy the original blank pre-authorized POS list, and go through the "pre-authorization confirmation" procedure according to how much you actually spent.