| TExternalLogin​Endpoint |
Entry point of the user-initiated identity-broker flow (the "Login with..." buttons on the Sphinx login page). Given the login transaction the login app is already running and the provider the user picked, it starts the authorization-code challenge against that upstream provider and redirects the browser to it. The upstream result is then handled by the shared external callback endpoint, which maps the identity to a local user and resumes the original downstream request.
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