Credit Card
What Is a Credit Card? Definition and How It Works
Definition
A credit card is a payment card issued by a financial institution that extends a revolving credit line to the cardholder, enabling purchases to be made on credit up to an approved limit. The cardholder repays the outstanding balance in full each month (avoiding interest) or carries a balance subject to interest charges. Credit cards are accepted globally through card network infrastructure and offer cardholders purchase protections, rewards programmes, and interest-free float between purchase and statement date.
How it works
A credit card transaction begins when the cardholder presents their card at a payment terminal or enters card details at an online checkout. The payment terminal or gateway sends an authorisation request through the acquirer and card network to the issuing bank. The issuer checks that the transaction does not exceed the cardholder's available credit limit, applies fraud scoring, and returns an authorisation response (approved or declined).
On approval, the issuer creates a pending charge against the cardholder's credit limit for the transaction amount. The funds do not leave the issuer's balance sheet at authorisation: the issuer has committed to pay the acquirer, but the actual money movement happens at clearing and settlement. At settlement (typically T+1), the issuer pays the acquirer the transaction amount net of interchange. The acquirer may pay the merchant the settlement amount net of acquiring fees or the acquirer may do gross settlement.
At the end of the billing cycle, the issuer generates a statement showing all transactions, the minimum payment due, the total balance, and the payment due date. If the cardholder pays the full balance by the due date, no interest is charged. If they carry a balance, interest accrues at the card's APR (Annual Percentage Rate). Minimum payments keep the account current but result in significant interest charges over time.
Credit card interchange rates are higher than debit card interchange rates, reflecting the cost of the credit facility the issuer provides. Consumer credit cards carry higher interchange than debit cards; premium rewards credit cards carry the highest interchange of all consumer card types, funding the rewards programmes through merchant-paid fees.
Why it matters
Credit cards are the dominant payment method for card-not-present and high-value transactions globally because of the protections and benefits they offer cardholders: Section 75 protection in the UK and chargeback rights under card scheme rules provide recourse for disputed transactions; rewards programmes return 0.5% to 3% of spend as cashback, miles, or points; and the interest-free grace period provides free short-term liquidity.
For merchants, credit cards carry the highest acceptance cost of any card type. Consumer credit card interchange in Europe is capped at 0.3% by the Interchange Fee Regulation; in the US, consumer credit card interchange averages 1.5% to 2.5% with no regulatory cap. Premium and rewards card interchange is higher still. Understanding the distribution of credit versus debit card transactions in their customer base is essential for merchants managing total cost of acceptance.
Credit card fraud is a primary fraud vector for card-not-present merchants. Card-not-present fraud uses stolen credit card numbers to make online purchases; strong authentication (3DS2, passkeys) and network tokenisation are the primary countermeasures. Credit cards have robust chargeback frameworks that can be used both by legitimate consumers with disputes and by bad actors committing friendly fraud.
With PXP
PXP accepts credit cards across Visa, Mastercard, American Express, and other schemes, with smart routing and 3DS to support authorisation. Talk to our team about how PXP can support your credit card acceptance.
Frequently asked questions
What is the difference between a credit card and a debit card?
A credit card draws on a credit line extended by the issuer: the cardholder spends borrowed money and repays the issuer later, with interest if the balance is not cleared monthly. A debit card draws directly from the cardholder's bank account: the funds are the cardholder's own money and are debited at transaction time. Credit cards typically carry higher interchange, offer better consumer protections and rewards, and provide an interest-free float; debit cards are cheaper for merchants and have no credit risk for the issuer.
Why do credit cards have higher interchange than debit cards?
Credit card interchange reflects multiple costs not present in debit card transactions: the cost of the credit facility (funding the float between purchase and cardholder repayment, credit losses from non-payment), the cost of rewards programmes (funded through interchange), and higher fraud liability assumed by the issuer for card-not-present transactions. Debit card transactions do not involve credit risk and typically do not carry rewards, resulting in lower interchange rates.
What consumer protections do credit cards provide?
Credit cards offer stronger consumer protections than most alternative payment methods. In the UK, Section 75 of the Consumer Credit Act makes the card issuer jointly liable with the merchant for purchases over £100, providing recourse even if the merchant goes insolvent. Card scheme chargeback rights allow cardholders to dispute transactions for non-delivery, misrepresentation, or fraud. These protections, funded through higher interchange, are a primary reason consumers choose credit cards over debit or bank transfer for higher-value purchases.
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