Understanding OAuth2 Authorization flows

OAuth 2.0 is a widely adopted protocol for granting applications limited access to a user's data on an API service without exposing passwords, with OAuth 2.1 in development to enhance security. Unified supports over 70 variants of OAuth2, focusing on the OAuth2 Code Flow for user consent-based access to third-party services, the OAuth2 OpenID Connect (OIDC) Flow for user authentication, and the OAuth2 Client Credentials Flow for server-to-server authentication. The OAuth2 Code Flow involves redirecting users to a provider's authorization page to approve access, exchanging codes for tokens, and using access tokens to call APIs, while Unified.to simplifies this process with pre-built components and an Authorization API. The OIDC Flow is used for instant identity verification, differing from the Code Flow by not supporting long-term access tokens. The Client Credentials Flow, used for machine-to-machine authentication, requires backend services to exchange client credentials for access tokens. Additionally, Unified.to supports API authentication methods using API keys, tokens, or username and password combinations, providing end-users with the necessary credentials for API access, and currently supports numerous integrations for these authentication methods.