How should security teams govern wallet-based strong customer authentication?

What security teams are actually governing

Wallet-based strong customer authentication is not just a sign-in method. It is a three-party control surface spanning the bank, the wallet issuer, and the customer journey, so governance has to define who authenticates whom, which signals each party can trust, and where the final accountability sits when a wallet is used for payment initiation or step-up authentication.

The practical question is whether the wallet path meets the bank’s required assurance level, not whether the wallet is popular or convenient. That means teams need a clear policy for enrollment, device binding, recovery, transaction approval, and exception handling, plus evidence that the path performs consistently across real customer scenarios.

This is where the control boundary matters. A bank can rely on a wallet only if it can show that the wallet issuer’s authentication, tokenisation, and recovery controls are compatible with the bank’s own risk model, fraud controls, and regulatory obligations. The bank still owns the decision to accept the wallet as an authenticated factor in its own channel.

Where trust breaks in the wallet path

Wallet-based authentication fails when organisations treat it as a black box. If the wallet issuer, device platform, and bank each assume another party is covering recovery, step-up rules, or fraud monitoring, gaps appear in assurance and auditability. That is why a governed trust relationship needs explicit control ownership, not just a technical integration.

For financial services teams, wallet authentication sits inside broader identity and payments governance. NIST’s digital identity guidance on authenticator assurance and phishing-resistant authentication is useful here because it anchors the question of whether the wallet path truly meets the required assurance rather than merely adding another login route, and the bank still needs to prove that alignment in its own control set through Financial Services Identity Security Guide and NIST SP 800-63 Digital Identity Guidelines.

Wallets also change the attack surface. A compromised device, weak recovery flow, or over-permissive trust in wallet assertions can turn a strong factor into a fragile one. That is why security teams should evaluate wallet-based SCA with the same scrutiny they apply to account recovery, delegated access, and session assurance, not as a consumer-facing convenience feature.

How to govern it without slowing adoption

Effective governance starts with a written trust model. Define which controls are owned by the bank, which are owned by the wallet issuer or platform provider, and which are shared. The bank should require evidence for device binding, cryptographic protection of the wallet credential, recovery friction, and fraud telemetry before approving the wallet path for production use.

Security teams should also make the approval decision specific to the use case. A wallet that is acceptable for low-risk step-up may not be acceptable for high-value payment initiation or account changes. If the wallet is used as part of authentication, the bank should document the assurance target and the failure conditions that force fallback to another method.

For implementation and control design, use a customer identity lens as well as a payments lens. The most useful internal navigation is to align this governance work with customer authentication, recovery abuse, and strong step-up policy, which is why the Customer IAM (CIAM) Guide is a natural companion for the customer journey side of the control, while the MFA Guide helps teams compare the assurance properties of wallet-based authentication with other factors and recovery methods.

Risk and Threat Considerations

Wallet-based SCA raises exposure when trust is granted faster than it is verified. The main risks are failed recovery governance, weak assurance in the wallet issuer path, device compromise, and inconsistent fallback handling, all of which can let an apparently strong authentication method become a weak access path.

Failure mechanism: A bank accepts wallet assertions without proving who owns recovery, how device binding is maintained, or when the wallet should be step-up challenged, so attackers target the weakest handoff rather than the wallet itself.

Impact: Fraud teams may see authenticated transactions that are hard to dispute, auditors may find unclear control ownership, and regulators may view the bank as having outsourced assurance without retaining adequate oversight.

Practitioner Guidance

What to verify: Before go-live, verify the wallet path against the exact actions it is allowed to authorize, not just against sign-in. The bank should be able to show assurance evidence for enrollment, recovery, transaction approval, logging, and fallback, plus a clear boundary for when the wallet issuer’s controls stop and the bank’s controls begin.

Decision rule: If the wallet can authorize a materially risky action, require explicit assurance proof and a documented exception path before accepting it as a strong factor. If that proof cannot be retained for audit or regulator review, treat the wallet as a lower-confidence channel until the control set is tightened.

Practitioner takeaway: The right governance model is not “Can we use the wallet?”, it is “Can we prove the wallet path gives us the assurance, ownership, and audit evidence required for the specific customer action?”

Related resources from NHI Mgmt Group

• How should security teams govern certificate-based authentication for machines and devices?
• How should security teams govern token-based authentication in cloud environments?
• How do teams evaluate whether wallet-based authentication is actually improving security?
• What should security teams do first when customer account APIs lack strong authentication controls?