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A bank card association is a network of issuing banks and acquiring banks that process payment cards under a specific brand. It sets the rules, standards, and technology infrastructure that allow a card to work at any merchant anywhere in the world. Visa and Mastercard are the most widely recognized examples, together accounting for roughly 90% of global payment processing outside of China.
Think of a bank card association as the highway system: the banks and merchants are the drivers, but the association builds the roads, sets the speed limits, and keeps the whole thing running.
The association does not issue cards and does not maintain customer accounts. Banks do both of those things. The association sits in the middle, routing transaction data between two separate banks: the issuing bank (your bank that gave you the card) and the acquiring bank (the merchant's bank that accepts the payment).
When you swipe a card, the association's network passes the authorization request from the acquiring bank to the issuing bank in milliseconds, receives approval or denial, and routes the response back. After the transaction, the association handles clearing and settlement, transferring funds between the two banks.
This confuses a lot of people. Visa and Mastercard do not lend money, set interest rates, or issue cards. They are payment technology companies that license their brand and network access to financial institutions. The bank that issues your Visa card determines your credit limit, interest rate, rewards program, and fees. Visa only processes the transaction.
Visa was founded in 1958 as BankAmericard by Bank of America, becoming an independent corporation in 1976. Mastercard was created in 1966 by a consortium of banks competing with BankAmericard and went public in 2006. Both transitioned from member-owned cooperatives to publicly traded companies, which separated their governance from the banks that once controlled them.
Visa and Mastercard earn revenue from assessment fees charged to issuing banks and acquiring banks for using their network. They also charge per-transaction processing fees at each stage of the authorization and settlement cycle.
Neither Visa nor Mastercard collects interchange fees directly. Interchange is the fee the acquiring bank pays to the issuing bank on each transaction. The association sets the schedule of interchange rates but does not receive that money itself. As of 2025, Visa has approximately 3.9 billion branded cards in circulation, issued by nearly 15,000 financial institutions worldwide.
Not all card associations follow the Visa/Mastercard model. American Express and Discover operate as closed networks. They issue their own cards, maintain their own acquiring services, and keep a larger share of the revenue from each transaction because they control all sides of the process.
Other major associations include China UnionPay, which dominates the domestic Chinese market, JCB from Japan, RuPay from India, and Troy in Turkey. Each operates under its own regulatory framework and geographic footprint.
Bank card associations set the rules that every bank and merchant must follow to maintain their license. Those rules cover dispute resolution procedures, security standards such as EMV chip requirements and 3D Secure authentication, data protection protocols, and the format used to communicate between systems (the ISO 8583 protocol is the technical standard for card transaction messages).
When a merchant disputes a chargeback or a cardholder challenges a fraudulent transaction, the outcome follows the association's published arbitration rules. That standardization is what allows a card issued in the United States to work at a merchant terminal in Japan without any special agreement between the two countries' banks.
Sources:
https://en.wikipedia.org/wiki/Card_association
https://kount.com/glossary/card-associations-or-card-networks
https://www.swipesum.com/insights/the-difference-between-visa-and-mastercard
https://www.paymentgenes.com/payments-what-the-faq/the-essential-role-of-visa-and-mastercard-in-card-transactions
https://staxpayments.com/blog/difference-between-mastercard-and-visa/
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