code: def _verify_nonce(self, nonce, context):
          
          backend_state = context.state[self.name]
          if nonce != backend_state[NONCE_KEY]:
              satosa_logging(logger, logging.DEBUG,
                             "Missing or invalid nonce in authn response for state: %s" %
                             backend_state,
                             context.state)
              raise SATOSAAuthenticationError(context.state, "Missing or invalid nonce in authn response")
docs: Verify the received OIDC 'nonce' from the ID Token.
          :param nonce: OIDC nonce
          :type nonce: str
          :param context: current request context
          :type context: satosa.context.Context
          :raise SATOSAAuthenticationError: if the nonce is incorrect