OAuth 2.0 provides delegated authorization. OpenID Connect (OIDC) adds identity on top. Key flows: Authorization Code + PKCE (SPAs, mobile), Client Credentials (service-to-service), Device Code (CLI/IoT). Understanding scopes, consent, token endpoints, and identity providers (Entra ID, Auth0, Keycloak) is essential.
The 5-Mode Loop
5 of 5 modes available
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Before this, understand: jwt auth