def METHOD_NAME(self):
    """Get the JWT configuration for OpenIDImplicitGrant. The JWT
    configuration will be used to generate ``id_token``. Developers
    MUST implement this method in subclass, e.g.::
        def get_jwt_config(self):
            return {
                'key': read_private_key_file(key_path),
                'alg': 'RS256',
                'iss': 'issuer-identity',
                'exp': 3600
            }
    :return: dict
    """
    raise NotImplementedError()