Design secure API authentication and authorization using OAuth 2.1, PKCE, scopes, and token best practices.
## CONTEXT I need to design authentication and authorization for an API in 2026, and I want to get it right rather than reinventing insecure patterns. The landscape has consolidated around OAuth 2.1 (PKCE mandatory, implicit flow removed), OpenID Connect for identity, and short-lived tokens with refresh rotation. The…
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