# Authorization

- [Initialisation](/hem-api/reference/api-reference/authorization/initialisation.md): Encedo HEM needs to be initialised before it's usable. This process is called Personalisation, and these two API endpoints are dedicated to this operation.
- [User authentication](/hem-api/reference/api-reference/authorization/user-authentication.md): Those endpoints allow to authenticate the User or Master based on passphrase.
- [External authenticator](/hem-api/reference/api-reference/authorization/external-authenticator.md)
- [Registration](/hem-api/reference/api-reference/authorization/external-authenticator/registration.md): Those endpoints allow to register a external authenticator, like Encedo Mobile Authenticator.
- [Authentication](/hem-api/reference/api-reference/authorization/external-authenticator/authentication.md): Those endpoints allow to authenticate based by External Authenticator.