The universal payment card required solving a coordination problem that took decades, and understanding how it was solved explains the fee structure that persists.
Store cards first
Individual merchants issued cards to regular customers, allowing purchase on account.
Which was a credit relationship between one merchant and one customer, and it did not require any network.
The limitation was obvious — a card usable in one place.
The charge card
A card usable at multiple merchants, with balances settled in full monthly.
Which required a third party to sign up both merchants and cardholders, and to bear the credit risk between purchase and settlement.
The business model was merchant fees plus annual cardholder fees.
The revolving credit innovation
Allowing balances to be carried with interest charged.
Which transformed the economics, since interest on carried balances became the dominant revenue source.
It also transformed the product from a payment convenience into a credit facility.
The chicken and egg problem
Merchants accept cards if enough customers hold them. Customers hold cards if enough merchants accept them.
Which is the classic two-sided market problem, and it was solved by mass unsolicited card mailings in some markets.
That approach produced substantial losses and regulatory response, and it did establish the base.
The network structure
Bank-issued cards operating on shared networks required interbank cooperation.
Which produced associations of banks agreeing rules for authorisation, clearing and settlement between the cardholder's bank and the merchant's bank.
The interchange fee, paid by the merchant's bank to the cardholder's bank, is the mechanism balancing incentives across the two sides.
Interchange
The most contested element.
Merchants argue it is set collectively and passed to them without negotiation.
Issuers argue it funds the cardholder benefits that create demand.
Competition authorities in several jurisdictions have investigated, and caps have been imposed in some markets.
Rewards
Funded substantially by interchange, which means merchants fund the benefits cardholders receive.
Which is passed into prices, meaning customers paying by other methods contribute to rewards they do not receive.
This distributional effect has been documented and is one argument in the interchange regulation debate.
What came after
Chip authentication reduced counterfeit fraud substantially, shifting fraud toward transactions where the card is not present.
Contactless payment reduced friction for small transactions, with limits set and periodically raised.
Mobile wallets added tokenisation, replacing the card number with a device-specific token, which addresses a specific fraud category.
And account-to-account payment systems now bypass the card networks entirely for some transactions, which is the first structural challenge to the model in decades.
Credit scoring
Statistical assessment replaced individual judgement in lending decisions.
Which allowed decisions at scale and removed some sources of discretion, and it introduced its own issues around what data is used.
Fair lending legislation in several jurisdictions restricts which characteristics may be used, and proxy variables remain a documented concern.
Securitisation
Packaging card receivables into securities sold to investors.
Which freed capital for further lending and distributed the credit risk.
It also weakened the incentive to assess borrowers carefully, since the risk was transferred, and that mechanism featured in the financial crisis in a different asset class.
Regulation
Disclosure requirements, restrictions on interest rate changes, payment allocation rules and limits on fees have been introduced in several jurisdictions.
Which followed evidence of practices that were profitable and difficult to defend, including allocating payments to the lowest-rate balance first.
Statements now generally show how long minimum payments would take to clear a balance, which was introduced because the figures are startling.
Debit and the alternative
Debit cards, drawing directly on an account, grew alongside and now exceed credit in transaction volume in many markets.
Which uses the same network infrastructure with different economics, and interchange on debit is generally regulated more tightly.
Fraud and liability
Liability rules determine who bears the loss when a card is used fraudulently.
Which shifted with authentication technology — when chip authentication was introduced, liability moved toward whichever party had not adopted it.
That shift drove adoption more effectively than any mandate, since the cost of not upgrading became direct.
Buy now pay later
Short-term instalment credit at the point of sale, which grew rapidly outside conventional credit regulation in several markets.
Which raised concerns about affordability assessment and about accumulation of multiple agreements.
Regulation has been extended to it in several jurisdictions, generally bringing it within existing consumer credit frameworks.
Financial inclusion
Access to payment cards requires a bank account, which a proportion of the population in most countries lacks.
Which means cashless transition risks excluding those people from services that stop accepting cash.
Legislation requiring continued cash acceptance has been introduced in several jurisdictions for this reason.
Cash and its decline
Cash use has fallen substantially in many countries, accelerated by recent events.
Which has consequences for those without banking access and for the resilience of payment systems, since electronic systems can fail.
Several countries have legislated to require continued cash acceptance for this reason.