ZITADEL API v2 (v4 GA)

Official docs: https://zitadel.com/docs/apis/v2

Architecture

ZITADEL Instance
  └── Organizations (multi-tenant units)
        └── Projects (group apps + roles)
              ├── Applications (OIDC / SAML / API clients)
              │     └── Application Keys (for API apps)
              └── Roles (custom keys: admin/viewer/editor/etc.)
                    └── Grant Assignments (user-to-role mapping)

Authentication

Who Is the Client?