Pre-authorization is equivalent to paying a deposit for consumption, but it is more convenient than paying a deposit, and the cardholder doesn't really have to take out the money. Compared with cash and debit cards, the advantages are obvious.

take a hotel as an example. When the cardholder checks in, he swipes the card at the front desk of the hotel for pre-authorization, and only freezes a certain overdraft limit on the D-stay cardholder's card, and the actual consumption deduction will occur when the cardholder leaves the hotel. Not all POS can do credit card pre-authorization transactions, and UnionPay only allows a few industries such as hotels, car rentals to open this function.

and your sesame credit limit is determined according to your AliPay level.

the reason for pre-authorization is that AliPay has made a guarantee for you.