docs: def delete_subscription(self, subscription_id):
          """
          Deleting an existing subscription
          :param subscription_id: is the subscription the client wants to delete
          """
          self._validate_uuid(subscription_id)
  
          url = "/notification/v1/subscription/{}".format(subscription_id)
          response = NWS_DAO().deleteURL(url, self._write_headers())
  
          if response.status != 204:
              raise DataFailureException(url, response.status, response.data)
  
          return response.status