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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def create(self, identity_id, service, token):
 """ Create the token :param identity_id: The ID of the identity to retrieve :param service: The service that the token is linked to :param token: The token provided by the the service :param expires_at: Set an expiry for this token :return: dict of REST API output with headers attached :rtype: :class:`~datasift.request.DictResponse` :raises: :class:`~datasift.exceptions.DataSiftApiException`, :class:`requests.exceptions.HTTPError` """


        params = {'service': service, 'token': token}

        return self.request.post(str(identity_id) + '/token', params)