How Does Credit Card Processing Work?
A 6-minute read
When you tap or swipe your card, a transaction flies through at least five companies in under two seconds. Here is what actually happens between you tapping and the receipt printing.
When you tap your card at a coffee shop, something remarkable happens in under two seconds: your request travels through a chain of companies, each one taking a cut, before the merchant sees a penny. Most people never think about what happens between the tap and the ding. That invisibility is by design.
The processing chain is deliberately complex, and that complexity has everything to do with who gets paid and how. Understanding it matters not just for curiosity but because these mechanics affect prices, merchant behavior, and even which businesses survive.
The short answer
Credit card processing routes a transaction through five steps: authorization, clearing, settlement, funding, and receipt. Each step involves a different company taking a fee. The whole chain runs in 1-2 seconds for the consumer but the money itself does not reach the merchant for 1-2 business days.
The full picture
The five steps
Authorization is the first checkpoint. When you tap or dip your card, the terminal contacts the payment processor, which forwards the request to the card network. The network routes it to the issuing bank, which checks whether your card is valid, whether you have credit available, and whether the transaction looks suspicious. If everything checks out, the issuing bank sends back an authorization code. This takes 1-2 seconds.
At this point the merchant has a promise of payment but no actual money. The funds are not yet transferred.
Clearing is the movement of transaction data between all the parties. After authorization, the processor collects all authorized transactions throughout the day and sends them in a batch to the card network for reconciliation. Clearing reconciles what each party owes without yet moving money.
Settlement is where money actually moves. The issuing bank transfers the transaction amount to the acquiring bank (the merchant’s bank), minus the interchange fee. The acquiring bank then credits the merchant’s account, minus their markup. This typically happens overnight.
Funding is when the merchant actually sees the money in their bank account. Even after settlement, many processors hold funds for 1-2 business days as a risk management measure, especially for new merchants or high-risk industries.
The four parties
Every transaction involves four distinct players. The cardholder is you. The merchant is whoever is selling you something. The issuing bank is the financial institution that gave you the card. And the acquiring bank is the merchant’s bank that processes payments on their behalf.
In between these four are two more companies that take fees: the card network (Visa, Mastercard, Amex, Discover) which operates the routing infrastructure, and the payment processor (Stripe, Square, Shopify Payments, Adyen) which provides the technology layer merchants use to connect to the network.
Each of these six parties takes a piece of the transaction fee, which is why merchants typically pay 1.5% to 3.5% per transaction.
How the fees split
The largest slice is interchange, set by the card networks and paid to the issuing bank. This is a percentage plus a fixed fee, typically 1.5% to 2.5% of the transaction. This is non-negotiable on the surface, though some processors pass through the exact interchange cost to merchants on bundled pricing plans.
The network fee goes to Visa or Mastercard for operating the rails. This is smaller, often 0.1% plus a fixed per-transaction fee.
The acquirer fee is what the merchant’s bank and payment processor charge for their service. This is where processors compete and where merchants have the most room to negotiate or shop around.
Why some transactions cost more
Not all cards are created equal from a merchant’s perspective. Rewards cards (travel cards, cashback cards) carry higher interchange rates because the issuing banks are absorbing the cost of the rewards. This is why some merchants push customers to use debit cards instead of credit cards, or why some airlines and premium services add surcharges for credit transactions.
Commercial cards, corporate cards, and business rewards cards carry the highest interchange fees of all, sometimes exceeding 3%. Large ticket items like travel bookings and B2B purchases can carry fees that make a meaningful dent in margins.
Why it matters
You interact with this system dozens of times a week without thinking about it, and yet it shapes what you pay for things in ways most people never notice. The 2-3% fee that merchants pay on every credit card transaction is built into prices whether you use credit or cash. Cash discounts, debit card incentives, and minimum purchase requirements are all direct responses to processing fees.
The settlement delay also has real implications for small merchants. When you tap today, the coffee shop owner typically does not see that money for 24-48 hours. For a business running tight on cash flow, this delay matters. This is one reason fintech companies like Stripe and Square have built entire businesses around giving merchants early access to their funds.
Common misconceptions
“The merchant pays nothing for credit card transactions.” This is false. Merchants pay 1.5% to 3.5% per transaction in fees. These are why some merchants set minimum purchase amounts for card payments or offer discounts for cash.
“If my card is declined, I must be out of money.” Declines happen for many reasons beyond your balance. Unusual spending patterns, card-not-present transactions on a card registered for card-present use, and fraud detection flags are all common triggers.
“All card networks charge the same fees.” Visa and Mastercard have very similar fee structures because they are competing for the same issuing and acquiring banks. American Express and Discover operate differently because they issue their own cards and set their own rules.
Key terms
Authorization — The near-instant approval (or denial) of a transaction by the issuing bank, resulting in a hold on the funds.
Interchange — The fee paid to the cardholder’s issuing bank, set by the card network and unavoidable for merchants.
Acquirer — The merchant’s bank, responsible for collecting funds from the issuing bank and depositing them into the merchant’s account.
Card network — The routing infrastructure (Visa, Mastercard, Amex, Discover) that connects issuing banks, acquiring banks, and processors.
Payment processor — The technology company providing the merchant-facing interface for accepting card payments.
Chargeback — A dispute-initiated reversal of a transaction, initiated by the cardholder with their issuing bank, resulting in a fee and fund withdrawal from the merchant.
Sources: How Credit Card Processing Works — Federal Reserve, How card payments work — Stripe