{ "step_up_token": "string", "expires_at": "2026-04-20T12:00:00.000Z" }
2 properties 2 required
step_up_token
Opaque sealed token (AES-256-GCM, base64url). Pass back on the next mutation via the `X-Mfa-Step-Up-Token` header. Valid for 5 minutes.
expires_at
After this timestamp the token is rejected and the caller must POST /mfa/step-up again.
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