Credit cards are given once an account has been approved by the credit provider, after which cardholders can use it to make purchases at shops accepting that card. When a purchase is made, the credit card user agrees to pay back the issuer. The person having credit card shows his will to pay by signing a receipt with a record of the card details and indicating the sum to be paid or by entering a personal identification number (PIN). Also, many merchants now accept verbal authorizations via telephone and electronic authorization using the internet, known as a ‘Card/Card holder Not Present’ (CNP) transaction. Electronic checking mechanism permits the vendors to check if the card is valid and the credit card customer has enough credit to cover the purchase in a few seconds, permitting the check to happen at time of purchase. Data from the card is obtained from a magnetic stripe which is called PIN, and more technically is an EMV card. Other types of verification systems are used by e-Commerce merchants to determine if the user’s account is valid and able to accept the charge.

It involves the cardholders providing additional information, such as the security code printed at the back of the card, or the address of the cardholders. Credit card issuers usually exempt interest charges if the balance is paid in full every month, but normally it charges full interest on the entire outstanding balance since the date of each purchase if the entire sum is not paid.