What is the pre-authorization card for hotel room door lock?

Hotel room door lock pre-authorization card is a kind of security card for setting door lock password, which is a measure to improve the security of customers' housing.

The so-called pre-authorization refers to the transaction in which the card issuer or its agent confirms the permitted frozen amount before the cardholder pays. In other words, pre-authorization refers to the transaction that the card issuing department needs to make a future payment commitment to the merchant when the customer consumes, because the consumption amount is uncertain. The pre-authorized transaction amount will be frozen, and it is not allowed to participate in other transactions before the pre-authorized settlement of the corresponding transaction takes place.