Templates / sequenceDiagram

Two-factor authentication

A TOTP-based second factor challenge after a successful password check.

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sequenceDiagram

sequenceDiagram
    actor User
    participant App
    participant API as Auth API
    participant Authenticator as Authenticator app

    User->>App: Enter username and password
    App->>API: Verify credentials
    API-->>App: Credentials valid, MFA required
    App-->>User: Prompt for 6-digit code
    User->>Authenticator: Read current code
    User->>App: Submit code
    App->>API: Verify TOTP code
    API-->>App: Code valid
    App-->>User: Grant session

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