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AuthRequest -> CachedToken
Initiate an OAuth2/SSO device authorization flow, printing a verification URI and user code to the terminal, and polling the token endpoint.
Problem it solves
Terminal-based applications cannot easily render interactive web-login screens directly to acquire secure access tokens.
Consumes
Emits
Establishes
The real projects this mechanism was found in. Attribution is the point — this is how the best teams actually do it.