Every swipe is a loan

When a card is approved at checkout, no money moves. Authorization is a promise — the issuer says “I will probably honor this” and places a hold. Clearing is an invoice — the actual claim arrives later in a batch file. Settlement is the money — funds move between banks days after the customer left the store. And for months afterward, the whole thing can be unwound by a dispute.

Which means every card transaction is a short-term loan wearing a checkout costume. The merchant ships goods against a promise. The issuer fronts trust against a cardholder’s word. The system works not because the loan is riskless but because an elaborate apparatus — interchange, chargebacks, network rules, fraud scoring — prices and polices that risk continuously.

People who design new rails “without all the card complexity” are usually deleting the loan’s collateral, not the loan. The credit exposure remains; only the machinery for governing it is gone.

An agent buying things is an agent originating micro-loans in your name. Design accordingly.