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## 3.1 Authorization Server

The handler on Authorization Server is responsible for implementing methods/validations that are over and above OpenID methods/validations.

- If no configuration is provided, DefaultOauthHandler is used by default. It contains the methods to validate request Object Claims, fetch public key and private key, etc.
- UKOAuthHandler extends DefaultOauthHandler and overrides the methods to implement the UK OpenBanking specific validations.

Note:

Any new Handler to be written for UK OpenBanking should extend UKOAuthHandler and override the required methods. Also the fully qualified name of the Handler should be given against this oauthHandlerConfig parameter.

Parent topic: HANDLERS