flash payment is a quick transaction method for financial IC cards (chip cards). The financial IC card with the function of "flash payment" has the words "flash payment" in Chinese and "QuickPass" in English. When using the "flash payment" function, only need to put the financial IC card near the "flash payment" sensing area of the acceptance terminal (POS machine) and the electronic cash balance of the financial IC card is enough to pay the money, then the acceptance terminal will complete the transaction immediately (the fastest time is only 5 milliseconds). The "flash payment" transaction does not require the cardholder to enter a password.