also called 3DS · Verified by Visa · Mastercard SecureCode
An extra online card authentication step many foreign merchants require before accepting payment.
The extra verification step many online card payments trigger, where you confirm the purchase through a code or your banking app before it goes through. Foreign booking sites lean on it heavily. If your card or bank handles it badly, the payment can fail at the worst moment. It is not a chargeback, which disputes a charge after the fact; this is the check that happens before the payment even completes.
Someone tries to grab a last-minute flight on a foreign airline's site, and the payment needs a confirmation code sent by their bank. Their bank routes it to an old phone number they no longer use abroad, the code never arrives, and the fare sells out while they are locked out of their own payment.
Cards or banks that mishandle 3DS can fail at foreign booking sites when you need a flight immediately.
The difference is the whole point, so here is each one in a line.
These are the ways a card proves it is you and undoes a bad charge.
Chip-and-PIN authenticates in person with a chip and number, contactless pays by tapping within a limit, and 3-D Secure is the extra online step many foreign sites demand before accepting a card.
A chargeback is asking your issuer to reverse a transaction after fraud, non-delivery or a billing problem.
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