# 3-D Secure

https://www.uniwebpay.com/glossary/three-d-secure/

*Last updated: 2026-08-03*

The card scheme mechanism for authenticating a cardholder during an online payment, moving the authentication step to the issuer. Whether and how it is applied to a given checkout is a matter for whoever operates that checkout, and it interacts with both fraud exposure and how many customers complete the payment.

## Why it matters to a merchant

The trade-off is the whole story: more checks mean fewer fraudulent transactions and also fewer completed ones, because some genuine customers abandon at the challenge. There is no setting that is right for every merchant — the right one depends on basket size, product type and how much fraud the business is actually seeing. It is a decision to revisit with data, not to set once.

## Related terms

*How a payment moves*

- [Authorisation](https://www.uniwebpay.com/glossary/authorisation/)
- [Capture](https://www.uniwebpay.com/glossary/capture/)
- [Settlement](https://www.uniwebpay.com/glossary/settlement/)
- [T+1 settlement](https://www.uniwebpay.com/glossary/t-plus-1/)
- [Batch](https://www.uniwebpay.com/glossary/batch/)
- [Reconciliation](https://www.uniwebpay.com/glossary/reconciliation/)
- [Chargeback](https://www.uniwebpay.com/glossary/chargeback/)
- [Refund vs void](https://www.uniwebpay.com/glossary/refund-void/)
- [Pre-authorisation (hold)](https://www.uniwebpay.com/glossary/pre-authorisation/)
- [Issuer decline](https://www.uniwebpay.com/glossary/issuer-decline/)
- [Merchant descriptor](https://www.uniwebpay.com/glossary/merchant-descriptor/)
- [Tokenisation](https://www.uniwebpay.com/glossary/tokenisation/)
- [Card on file](https://www.uniwebpay.com/glossary/card-on-file/)
- [Payment link](https://www.uniwebpay.com/glossary/payment-link/)
- [ARN (acquirer reference number)](https://www.uniwebpay.com/glossary/arn/)
- [Representment](https://www.uniwebpay.com/glossary/representment/)
- [Chargeback ratio](https://www.uniwebpay.com/glossary/chargeback-ratio/)

- [All 74 terms](https://www.uniwebpay.com/glossary/)

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