When the POS machine has no money to transfer, the fixed card number is empty and can be solved in the following ways. The card number is entered incorrectly, please check the bank card number and re-enter it (generally the first digit of the card number is an Arabic numeral, not the letter b). The card type is wrongly selected. You should choose a credit card, but choose a debit card instead. (Generally, credit cards are 16 digits, and debit cards are 19 digits.) You need to pay attention to the card type when inputting. The card has been cancelled, and you will be prompted that the bank card number does not exist and carefully verify the card number information.