OAuth2 Authentication A comprehensive skill for implementing secure authentication and authorization using OAuth2 and OpenID Connect. This skill covers all major authorization flows, token management strategies, security best practices, and real-world implementation patterns for web, mobile, and API applications. When to Use This Skill Use this skill when: - Implementing user authentication in web applications, SPAs, or mobile apps - Building API authorization with access tokens and refresh tokens - Integrating social login (Google, GitHub, Facebook, Twitter, etc.) - Creating secure machine-t…