What Is One-time Password? Definition, Payment Flow, and Examples
One-time Password (OTP) is a code valid for one action or a short period and can be an authentication factor without automatically constituting complete SCA. This guide focuses on OTP's real role, boundaries, and common points of confusion.
Key points
- Definition: One-time Password (OTP) is a code valid for one action or a short period and can be an authentication factor without automatically constituting complete SCA.
- Flow position: Where applicable, SCA requires multiple elements from independent categories and can require dynamic linking to the amount and payee.
- Do not confuse: OTP / Strong Customer Authentication
How it fits into the payment flow
For OTP, the relevant process is as follows: Where applicable, SCA requires multiple elements from independent categories and can require dynamic linking to the amount and payee. An OTP is one possible authentication tool, while AVS compares address information; neither automatically equals complete SCA.
A practical review of OTP should account for this: whether SCA is required, whether an exemption applies, and which provider owns the obligation depend on jurisdiction, transaction initiation, and provider roles. Users should authenticate only in a trusted issuer interface.
Practical example
A bank sends a one-time password for the current action, and the customer enters it only in the official interface. Support should never ask for the code through chat.
How it differs from related terms
| Term | Definition |
|---|---|
| One-time Password | is a code valid for one action or a short period and can be an authentication factor without automatically constituting complete SCA |
| Strong Customer Authentication | is a regulatory requirement in some regions to verify a payer with independent factor categories, with scope and exemptions varying by jurisdiction |
| CVV/CVC | is a short card security value commonly checked in card-not-present payments and is not the cardholder's PIN |
OTP focuses on the fact that it is a code valid for one action or a short period and can be an authentication factor without automatically constituting complete SCA. Strong Customer Authentication, by contrast, is a regulatory requirement in some regions to verify a payer with independent factor categories, with scope and exemptions varying by jurisdiction. They can appear in one transaction while answering different questions.
Use cases and limits
A key limit of OTP is the following: SMS codes can be phished, redirected, or obtained through social engineering, and an address match is only one signal. No single result is absolute proof against fraud.
Frequently asked questions
These answers address two common search questions about OTP.
Is it the same as Strong Customer Authentication?
No. One-time Password (OTP) is a code valid for one action or a short period and can be an authentication factor without automatically constituting complete SCA. Strong Customer Authentication (SCA) is a regulatory requirement in some regions to verify a payer with independent factor categories, with scope and exemptions varying by jurisdiction. Compare the object, processing stage, and responsible party.
Does a one-time password by itself always satisfy strong customer authentication?
For OTP, no. SCA generally involves multiple independent element categories and applicable dynamic-linking rules. One OTP does not automatically prove compliance of the full flow.
These primary sources support the definition and process for OTP. Current product, network, and local rules still control a real transaction.