Two-Factor Login (Mermaid Sequence)

Password plus one-time code sign-in.

MermaidUML & Software Mermaid syntax docs

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sequenceDiagram
  participant U as User
  participant A as App
  participant S as Auth Service
  U->>A: Enter password
  A->>S: Verify password
  S-->>A: ok, send OTP
  S->>U: SMS code
  U->>A: Enter code
  A->>S: Verify code
  S-->>A: token
  A-->>U: Signed in