Explains OAuth 2.0 (delegated authorization) and OpenID Connect (authentication/identity) as standards for secure third-party access in SPAs and microservices; details flows and tokens (access/refresh vs ID), contrasts purposes, shares best practices (choose flow, validate and securely store tokens, handle revocation), illustrates with a FitBuddy–Spotify integration, and advises combining both for a robust, seamless user experience.
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