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## 3.2 Resource Server

The handler on Resource Server is responsible for implementing methods/validations of OpenBanking.

- If no configuration is provided, DefaultMessageSignatureHandler is used by default. It contains the methods to validate jwt token headers, fetch public key and private key, etc.

Note:

Any new Handler to be written for UK OpenBanking should extend DefaultMessageSignatureHandler and override the required methods. Also the fully qualified name of the Handler should be given against `MESSAGE_SIGNATURE_HANDLER` property Id and commited in database.

Parent topic: HANDLERS