Pre-authorization: POS machine-main menu-pre-authorization-pre-authorization-swipe card-enter authorization amount-enter password (if there is no password, press Enter directly)-print out pre-authorization POS sheet.

Pre-authorization after swiping the card: POS machine-main menu-pre-authorization-pre-authorization completion-swiping the card-entering the amount of authorization completion-confirmation-printing the pre-authorization POS sheet.

However, the card pre-authorization is completed: POS machine-main menu-pre-authorization-pre-authorization is completed-manually enter the card number-manually enter the card validity period-manually enter the pre-authorization code-manually enter the authorization date-enter the authorization completion amount-confirm-print out the pre-authorization POS sheet.