Pos error code 45, 82, because many places and banks in the country stop supporting the magnetic stripe card transaction function for some bank cards and credit cards, and they must trade through ic cards. If POS card swiping fails, prompt 45 or 82 indicates that the card can't be traded with magnetic stripe card, but can only be inserted in ic mode! \x0d\ This situation is called a downgrade transaction. \x0d\ The main reason is that cashier has formed the habit of accepting magnetic stripe cards for a long time. On the terminal with chip acceptance function, the cashier still accepts the financial IC card by brushing the magnetic stripe. This operation reduces the security of financial IC card transaction, which is called degraded transaction in the industry. \x0d\ Closing the degraded transaction means canceling accepting the magnetic stripe transaction mode in the composite card and accepting only the chip transaction mode instead. In short, for the composite card with magnetic stripe and chip, only the chip part will be used for transaction.