Return Clef user info after exchanging logout token.

def get_logout_information(self, logout_token):
        """Return Clef user info after exchanging logout token."""
        data = dict(logout_token=logout_token, app_id=self.app_id, app_secret=self.app_secret)
        logout_response = self._call('POST', self.logout_url, params=data)
        clef_user_id = logout_response.get('clef_id')
        return clef_user_id