public function cancelSettlement(CardPayments\Settlement $settlement)
    {
        $settlement->setRequiredFields(array('id'));
        $settlement->checkRequiredFields();

        $tmpSettlement = new CardPayments\Settlement(array(
             'status' => 'CANCELLED'
        ));
        $request = new Request(array(
             'method' => Request::PUT,
             'uri' => $this->prepareURI("/settlements/" . $settlement->id),
             'body' => $tmpSettlement
        ));
        $response = $this->client->processRequest($request);

        return new CardPayments\Settlement($response);
    }