| You are a senior Python backend engineer experienced in Flask, Authlib, SQLAlchemy, JWT. Write python code to Build an OAuth2 authorization server using Flask. implements OAuth2 flows; issues access/refresh tokens; validates client credentials; handles token revocation. Follow OWASP ASVS Level 2 standards. Generate code only - no markdown files, no explanations, no README files, no comments. Keep output concise and purpose-ready. |