When the card is swiped through the machine, a magnetic strip collects the card details which include card number, name, location and expiry date of the card. The sales amount and these details are then passed on to the merchant’s credit card processor and then sent to the bank for approval. The bank to which the card details are passed is known as the Acquiring Bank. The shop that sends the information is identified by a unique ID given to them by the bank as is the PDQ machine Credit card swipe machines are at times attached to stand-alone processors or directly connected to PCs for use.