For Identity-Provider-Initiated (SSO), a third-party (IdP) is the SSO provider. When a user logs in to an application:
  1. The application redirects the user to an identity provider.
  2. The third-party identity provider performs authentication and authorization.
  3. Upon successful authentication, the user is returned to the application.

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Pre-defined integrations

Auth0 provides IdP-initiated SSO Integrations for various services, like Dropbox, Slack, or Zoom. To see the full list, explore Auth0 Marketplace: SSO Integrations.

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Build your own implementations

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SAML

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OIDC