AuthN vs AuthZ - OAuth - JWT - ACLs: Complete API Security🚀😊👍
Description
Secure APIs properly - Authentication ≠ Authorization:
✅ AuthN: Email → JWT token
✅ AuthZ: Token → Permissions (RBAC + ACLs)
✅ OAuth 2.1: Complete authorization flow
✅ Spring Security: @PreAuthorize + JWT decoder
✅ OPA: External policy engine
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