Centralized Authentication: Use a central authentication service (e.g., Auth0,?

Short answer: Keycloak) to handle user login and issue access tokens (JWT). The authentication service verifies credentials (e.g., username/password) and provides tokens for users to access microservices.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.