A card payment moves through four parties - the cardholder, the merchant, the merchant's acquiring bank, and the cardholder's issuing bank - connected by a card network (Visa, Mastercard). Authorization happens in seconds; clearing and settlement complete over the following 1–3 business days. The merchant pays interchange (to the issuer), assessment (to the network), and acquirer markup as fees.
The four-party model, authorization vs. settlement, interchange economics, and the data flow behind every swipe, dip, or tap.
Process flow
- 1Cardholder tapsEMV contactless card or wallet presents tokenized credential.
- 2Merchant terminalForms authorization request, sends to acquirer.
- 3Card networkRoutes message to the correct issuer.
- 4Issuer decisionApproves or declines based on risk and credit.
- 5Authorization responseApproval returns to terminal in ~2 seconds.
- 6Clearing & settlementFunds move T+1 to T+3 after batch submission.
The four-party model
Every card transaction involves four core parties. The cardholder presents a payment credential. The merchant accepts it via a terminal or gateway. The acquirer (merchant's bank) routes the transaction request to the relevant card network. The issuer (cardholder's bank) decides to approve or decline. American Express and Discover historically operated three-party models, where the network is also the issuer and acquirer, though this distinction has blurred.
Authorization in real time
When a card is presented, the terminal forms an authorization request containing the card number (or token), amount, MCC, and merchant ID. The acquirer forwards this through the network to the issuer, which runs fraud and credit-limit checks and returns an approval or decline code. The full round-trip typically completes in 1–3 seconds.
Clearing and settlement
Approved transactions are batched at the merchant level and submitted overnight for clearing. The network reconciles obligations between issuer and acquirer, and central-bank money moves to settle the net positions, typically T+1 to T+3. The merchant's bank then deposits net funds, having deducted interchange, assessment, and processor fees.
Interchange economics
Interchange is the fee paid by the acquirer to the issuer for each transaction - typically the largest component of merchant discount. Interchange varies by card type (debit vs. credit, consumer vs. commercial), MCC, geography, and acceptance method. In the U.S., debit interchange is capped for regulated issuers under the Durbin Amendment; credit interchange is not.
Why EMV and contactless matter
EMV chip cards generate a dynamic cryptogram per transaction, eliminating the magstripe replay attack. Contactless adds a tokenized credential and tap-and-go UX with the same security guarantee, while mobile wallets layer device-bound biometrics on top.
Frequently asked
How long does a card authorization take?+
Typically 1–3 seconds from terminal to issuer and back, end-to-end.
What is interchange?+
The fee the merchant's acquirer pays the cardholder's issuer for each transaction - the largest single component of card acceptance cost.
When does the merchant actually get paid?+
Net funds arrive 1–3 business days after the transaction batch is submitted for clearing.
Sources & References
- U.S. Federal Reserve - Payment Systems Overview
- Visa - How Contactless Works
- Mastercard - Tokenization
- EMVCo - EMV Specifications
External references are cited for context and discovery. CashlessTechnology.com is not affiliated with the listed organizations unless explicitly stated.