Retrieve user objects of the entire administration.

        :return: list of dictionary with users information
        :rtype: list(dict)
        -------

def _retrieve_users(self):
        """
        Retrieve user objects of the entire administration.

        :return: list of dictionary with users information
        :rtype: list(dict)
        -------

        """
        users_url = self._build_url('users')
        response = self._request('GET', users_url)
        users = response.json()
        return users