Visa and Mastercard mostly do not issue cards or lend money. They run the messaging and settlement rails that connect a shopper’s bank to a merchant’s bank, and set the rules and fees that govern each transaction.
Key takeaways
- Visa and Mastercard operate payment networks that route authorisation messages and settle funds between banks, rather than lending money to cardholders directly.
- The card sitting in a wallet is issued by a bank or another licensed institution, which carries the credit risk and handles the customer relationship.
- Interchange fees flow from the merchant’s side of the transaction to the card issuer, and network rules determine how those fees are structured.
- Merchants, consumer groups, regulators and fintech firms disagree sharply over whether card network pricing reflects genuine competition.
- Alternative rails, including bank-to-bank instant payment systems, are being built in several countries, but adoption varies widely and outcomes remain uncertain.
What actually happens when a card is tapped
A card payment looks instantaneous, but it involves several distinct organisations exchanging messages in sequence. When a card is tapped or entered online, the merchant’s payment terminal or gateway passes the transaction details to an acquirer — the bank or processor that holds the merchant’s account. The acquirer forwards an authorisation request into a card network. The network routes that request to the issuer, the institution that gave the cardholder the card. The issuer checks whether the account exists, whether funds or credit are available, and whether the transaction looks fraudulent, then returns an approval or decline back along the same path.
That round trip is what the network primarily provides: a standardised, always-on switch that lets any participating acquirer reach any participating issuer without needing a bilateral relationship with each one. The second function is clearing and settlement. Authorisation only reserves funds; later, the network aggregates transactions, calculates what each member institution owes or is owed, and coordinates the movement of money between them.
The third function is rulemaking. Networks publish extensive operating regulations covering how disputes are handled, what security standards participants must meet, when a chargeback is permitted, and how fees are calculated. Enforcement of those rules — through fines, monitoring programmes or removal of network access — is a significant part of what a network does.
Why this is being discussed now
Explanations of card network mechanics circulate periodically among technically minded audiences, often when someone publishes a clear write-up of infrastructure that most people use daily without examining. The specific reasons a given explainer attracts attention at a given moment are not something that can be established from a headline alone.
Broadly, several long-running currents keep the topic active. Regulators in multiple jurisdictions have examined card fees and network rules over a period of years. Instant bank-transfer systems have been launched or expanded in a number of countries. Fintech firms and large merchants have built or proposed routes around traditional card processing. Litigation between merchants and card networks over fee structures has a long history in some markets. Any of these can renew interest in the underlying question of what the networks actually do.
The background a newcomer needs
The card industry is usually described as a four-party model. The four parties are the cardholder, the issuer, the merchant and the acquirer, with the network sitting in the middle as the switch that connects issuer and acquirer. Visa and Mastercard are the best-known examples of this structure. Some other card brands historically operated a three-party model, acting as both network and issuer, though several have moved towards issuing through partner banks.
Both major networks began as bank-owned associations — cooperative structures created so that member banks could accept each other’s cards. Both later converted to publicly traded companies. That history matters because it explains a persistent source of confusion: the networks’ original members were the banks, not the cardholders or the merchants, and much of the rulebook was designed to coordinate behaviour among those member institutions.
Interchange is the concept that causes the most misunderstanding. When a transaction settles, a portion of the amount is retained by the issuer rather than passed to the merchant. That portion is interchange. The network sets default interchange rates but does not, as a rule, keep that money itself. The network’s own revenue comes from separate assessment and service fees charged to issuers and acquirers, plus fees for value-added services such as fraud scoring, tokenisation, data products and processing. This distinction — interchange to issuers, network fees to networks — is central to any argument about who benefits from card pricing.
Who is affected and how
Merchants bear the merchant discount rate, the total cost of accepting a card, of which interchange is typically the largest component. Small merchants often pay bundled rates through a payment service provider and have limited visibility into the underlying components. Large merchants may negotiate directly and may be able to influence how transactions are routed.
Issuers receive interchange, which funds rewards programmes, fraud losses, customer service and the cost of extending credit. This creates a widely noted dynamic: cards with richer rewards generally carry higher interchange, so the rewards a cardholder enjoys are funded, at least in part, through costs borne on the merchant side.
Cardholders benefit from broad acceptance, dispute rights and chargeback protection, which are network-rule products rather than statutory rights in every jurisdiction. Consumers who do not use cards, or who use lower-tier cards, may still face prices that reflect merchants’ average acceptance costs, depending on whether surcharging is permitted locally.
Acquirers and payment processors sit between merchants and the networks, adding their own margins and services. Fintech companies build on top of these rails, and many nominally novel payment products still ultimately route over card networks.
Where informed people disagree
The central disagreement concerns whether card network pricing reflects a competitive market. One view holds that the networks compete vigorously with each other and with alternative payment methods, that interchange is a legitimate mechanism for balancing a two-sided market, and that the fees fund fraud prevention, credit availability and near-universal acceptance. On this account, price caps risk reducing card benefits or shifting costs to cardholders through higher annual fees.
The opposing view holds that merchants cannot practically refuse the major networks, that this weak bargaining position allows fees to remain above competitive levels, and that network rules have historically restricted merchants’ ability to steer customers towards cheaper methods. Advocates of this position point to jurisdictions that have capped interchange as evidence that lower fees are workable.
A third strand of disagreement concerns remedies. Some favour regulatory caps, some favour mandatory routing choice, and some argue that new bank-transfer rails will erode card dominance without intervention. Evidence on outcomes from interchange caps is contested, particularly on whether merchant savings reach consumers as lower prices. Reasonable analysts read the available studies differently, and results appear to vary by market.
The practical implications
For anyone building or operating a business that takes payments, the structure explains several otherwise puzzling features. Pricing is layered, so an advertised processing rate rarely reflects the full cost; interchange-plus pricing separates the components, while blended pricing hides them. Chargeback rules are set by the networks, which is why dispute timelines and evidence requirements look similar across providers. Compliance obligations around card data handling flow from network-backed standards rather than from a single legislature.
For consumers, the practical implication is that a card transaction involves at least four organisations with different incentives, and that protections such as chargebacks depend on which institution issued the card and which network processed the payment. Debit and credit transactions can be routed differently and can carry different protections even on the same physical card.
What to watch next
Several developments are worth following, without assuming any particular outcome. The first is the growth of account-to-account instant payment systems and whether they gain traction at the point of sale, where card habits are entrenched. The second is regulatory activity on interchange, routing choice and network rules in major markets, where proceedings tend to move slowly and outcomes are hard to predict.
The third is the networks’ own expansion beyond switching into fraud analytics, identity, tokenisation and business-to-business payments — a shift that would change what the term “card network” means. The fourth is the treatment of stablecoins and other alternative settlement mechanisms, where claims frequently outpace deployed volume. In each case, specific figures, timelines and pending decisions should be checked against primary sources rather than assumed.
Frequently asked questions
Do Visa and Mastercard issue credit cards?
Generally no. Visa and Mastercard operate the networks and set the rules, while banks and other licensed institutions issue the cards, decide credit limits, approve applications and bear the credit risk. The name printed on a card usually indicates which network processes the payment, not who lent the money. Some card brands operate differently by combining network and issuing functions, but the two largest networks primarily follow the four-party model.
What is interchange and who receives it?
Interchange is the portion of a card transaction retained by the issuing bank rather than passed on to the merchant. The card network typically sets default interchange rates but does not keep the money itself. Issuers use interchange to fund rewards, fraud losses, servicing and credit costs. Merchants pay it indirectly through the total cost of card acceptance, which also includes acquirer margins and separate network fees.
How do the card networks make money?
Networks charge assessment fees on transaction volume and service fees for processing and switching, paid by issuers and acquirers. They also sell additional services such as fraud scoring, tokenisation, data analytics and consulting. These revenues are distinct from interchange, which goes to issuers. Exact rates and revenue splits vary by market, product and contract, and are not uniformly published, so specific figures should be taken from company disclosures.
Why do merchants complain about card fees?
Merchants argue that the major networks are effectively unavoidable, since refusing them would mean losing a large share of customers, and that this weakens their ability to negotiate. They also point to network rules that have limited steering customers towards cheaper payment methods. Networks and issuers respond that fees fund fraud prevention, guaranteed payment and universal acceptance. The dispute has produced litigation and regulatory review in several jurisdictions.
What is a chargeback and who decides it?
A chargeback is a reversal of a card payment, usually initiated by the cardholder through their issuer for reasons such as fraud, goods not received or goods not as described. The network’s operating rules define the permitted reasons, deadlines and evidence requirements, and provide an escalation process when merchant and issuer disagree. Chargeback rights derive largely from these private rules, though some jurisdictions add statutory consumer protections.
Could bank transfers replace card networks?
Instant account-to-account payment systems exist in a number of countries and handle substantial volumes in some of them. Whether they displace cards at the point of sale depends on consumer habits, dispute protections, rewards, credit access and merchant incentives. Cards offer deferred payment and established chargeback rights that transfer systems do not always match. Outcomes differ markedly by country, and no general prediction can be made confidently.
Sources and further reading
- Public filings and investor materials from listed payment network companies, which describe revenue categories and business segments in their own terms.
- Central bank and payments regulator publications in several jurisdictions, which analyse interchange, routing and retail payment system structure.
- Competition authority and court records concerning merchant litigation and regulatory proceedings over card fees, which set out both sides’ arguments.
- Industry technical documentation on card authorisation messaging, tokenisation and data security standards, useful for understanding transaction mechanics.
Surfaced from the hackernews signal “explainer on payment infrastructure”. AI-assisted draft, editorially reviewed.
