1. Define the `AuthParams` and `AuthData` interfaces.
2. Create an `authHandler` function to validate credentials.
3. Register the `authHandler` with a `Gateway`.
4. Protect API endpoints using the `auth: true` option.
5. Access authentication data in endpoints using `getAuthData()`.
6. Implement service-to-service authentication propagation.
7. Handle different authentication scenarios (JWT, API Key, Cookies).
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