Deleting an existing endpoint
        :param endpoint_id: is the endpoint that the client wants to delete

def delete_endpoint(self, endpoint_id):
        """
        Deleting an existing endpoint
        :param endpoint_id: is the endpoint that the client wants to delete
        """
        self._validate_uuid(endpoint_id)

        url = "/notification/v1/endpoint/{}".format(endpoint_id)
        response = NWS_DAO().deleteURL(url, self._write_headers())

        if response.status != 204:
            raise DataFailureException(url, response.status, response.data)
        return response.status