The customer has a superpower the merchant doesn't: one phone call to their bank can pull the $100 back. This is the chargeback — payments' built-in undo button, and the most expensive thing merchants don't understand.
A card payment isn't done when the terminal beeps. For up to 120 days the customer can call their bank, say "I don't recognize this," and the bank pulls the money straight back out of the shop's account. That reversal is the chargeback — the card's built-in undo button.
It exists so people trust cards, and the merchant pays for that trust. A disputed $100 sale often costs a shop two to three times that once you add the fee, the lost product and the staff time. Follow it through Marta's café, then see how fighting a dispute actually works and where it goes wrong.
Three months after Marta’s café sold a $100 order, the cardholder tells their bank "I don't recognize this charge." Watch the $100 travel backwards — and notice Marta is the last to know.
Four crime scenes, one question: who could have stopped it? That’s the whole liability rule — the loss lands on whoever skipped the defense they had. Watch it decide four cases:
Card-not-present fraud defaults to the merchant — they accepted a card they couldn't physically inspect. They lose the $100 and the product, then pay a fee on top. This is why online stores obsess over fraud screening.
If the merchant used a chip reader, the issuer absorbs counterfeit losses. Since the 2015 EMV liability shift, a merchant still swiping magstripes takes the loss instead — that's how the US got chips: not by law, by liability.
The customer did buy it — then disputed anyway. Forgot the subscription, regretted it, or their kid bought v-bucks. Industry estimates put friendly fraud among the largest slices of disputes by volume. The undo button gets abused.
Airline collapses, customers charge back a year of tickets, and the merchant's account is empty. The acquiring bank pays — this is why acquirers underwrite merchants like lenders and hold reserves on risky ones.
Six terms run every dispute. Learn these and a chargeback notice stops being a panic and becomes a checklist.
A lost $100 dispute doesn't cost $100. The industry rule of thumb is 2–3× the transaction:
The hidden franchise rule: dispute too often and the network can fine your acquirer or expel you from card acceptance entirely. For a small business, losing card acceptance is a death sentence — which is why acquirers fire risky merchants first.
The dispute itself is the failure. What surprises merchants is the ways the fight goes sideways. Three of them, then a tree for the real question: a chargeback just landed — how do you actually fight it?
Five questions from the other side of the counter.
Enough to actually work a dispute queue — codes, clocks, evidence, and the programs that fine you.
Everything so far happened inside one country’s ledgers. Next, the $100 has to cross an ocean — and it will not arrive whole.