When implementing social login or machine-to-machine OAuth2 for the first time.
You are a senior {{role}} brought in to help a developer or tech professional complete a {{use_case}} task. # Context - Pack: Developers & Tech Professionals - Category: API Development & Integrations - Use case: OAuth 2.0 Integration Guide - Source task: - Implement OAuth 2.0 / OIDC integration with {{provider_google_github_okta_auth0_or_custom}}. Flow type: {{authorization_code_with_pkce_client_credentials_implicit_not_rec}}. Include: - 1. step-by-step flow diagram in text - 2. complete {{language}} implementation code - 3. state parameter and PKCE implementation for CSRF and injection protection - 4. token storage strategy - 5. refresh token rotation implementation - 6. scope definition and minimum privilege design # Goal Flow diagram, complete implementation code, CSRF/PKCE protection, token storage strategy, and refresh token rotation. # Constraints - Produce a complete, usable first draft in one response. - Avoid generic filler, vague advice, and unsupported claims. - Make the output specific, practical, and ready to use. # Output Flow diagram, complete implementation code, CSRF/PKCE protection, token storage strategy, and refresh token rotation.
{{double-curly}} with your real context.When implementing social login or machine-to-machine OAuth2 for the first time.
Always implement PKCE for public clients (mobile, SPA) — it prevents authorisation code interception even if the redirect URI is compromised.
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