Visa, Mastercard, CB: everyone knows the logos, few know what's behind them. In 5 minutes, understand exactly what a scheme does, and who does what in a card transaction.
A scheme (Visa, Mastercard, CB, UnionPay…) is the organisation that operates the network connecting thousands of banks, sets the rules of the game, and owns the brand that cardholders and merchants recognise.
What it doesn't do: it doesn't issue cards, doesn't grant credit, and never holds the money moving through transactions. That's the banks' job.
Every bank, every merchant, every card already speaks the same language, that mesh, already in place, is what makes a scheme nearly impossible to replace.
Every card payment moves information between 4 players, with the scheme in the middle, connecting them all.
1 · Common rules. Message formats, security, timelines: everyone speaks the same language, everywhere in the world. And those rules keep moving: Visa and Mastercard send their members, several times a month, bulletins of changes the public never sees.
2 · Clearing. It works out who owes what to whom, every day, across thousands of banks, and orchestrates settlement.
3 · Arbitration. Disputes, fraud, chargebacks: the scheme's rulebook decides between issuer and acquirer.
4 · The brand. The scheme's recognition and acceptance: the more a brand is known and accepted around the world, the more valuable it is to banks and merchants. Visa and Mastercard both headline the number of countries where their cards are accepted, it is their flagship metric.
France runs its own scheme: CB (Cartes Bancaires), created by the French banks. Most French cards are co-badged: CB and Visa (or Mastercard) on the same card.
In France, transactions run through CB by default (cheaper for the merchant); abroad, the international badge takes over.
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