Card Network

The infrastructure and organization that connects merchants, acquiring banks, issuing banks, and cardholders to facilitate electronic payment card transactions, with major networks including Visa, Mastercard, Discover, and American Express.

Card networks (also called payment networks or card schemes) provide the technology infrastructure, operating rules, and brand identity that enable payment cards to be accepted globally. When a customer swipes, dips, or taps their card, the card network routes the authorization request from the merchant's acquiring bank to the customer's issuing bank, receives the approval or decline response, and routes it back to complete the transaction in seconds.

The four major card networks in the United States are Visa and Mastercard (which operate as open-loop networks, meaning they don't issue cards or provide merchant accounts directly), Discover (which operates its own issuing and acquiring operations), and American Express (which historically issued its own cards and managed merchant relationships, though it now works with partner issuers and acquirers as well). Each network establishes interchange fee schedules, operating regulations, security standards, and dispute resolution processes that all participating banks and merchants must follow.

Card networks generate revenue primarily through assessment fees charged to acquiring banks based on transaction volume, along with network authorization fees, cross-border fees, and various service fees. They invest heavily in infrastructure, fraud prevention technology, global acceptance, brand marketing, and network security. For merchants, card network rules dictate many aspects of payment acceptance including chargeback processes, data security requirements (PCI DSS), acceptable use policies, and fee structures. While merchants don't contract directly with card networks, they must comply with network rules as conditions of their merchant processing agreements.

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Related Terms

3D Secure

An authentication protocol for online card transactions that adds an additional verification layer between the cardholder and issuing bank, shifting fraud liability from merchants to card issuers when properly implemented.

ACH Payment

Automated Clearing House payment is an electronic bank-to-bank payment method that transfers funds directly between bank accounts through the ACH network, typically used for direct deposits, bill payments, and recurring transactions.

Acquirer

A financial institution that processes credit card payments on behalf of merchants, maintains merchant accounts, and facilitates the settlement of funds from card-issuing banks to merchant bank accounts.

Address Verification Service (AVS)

A fraud prevention tool that compares the numeric portions of a billing address provided during a transaction against the address registered with the card-issuing bank, returning match result codes to help merchants assess transaction risk.

Aggregator

A payment service provider that enables multiple merchants to process card transactions under a single master merchant account rather than each merchant having their own dedicated merchant account, common with services like Square, Stripe, and PayPal.