public function deleteContact($contactId)
    {
        if ($contactId) {
            $url = $this->getApiEndpoint() . self::REST_CONTACTS . $contactId;
            $this->setUrl($url)
                ->setVerb('DELETE');

            $response = $this->execute();

            if (isset($response->message)) {
                $message = ' url : ' . $url . ', ' . $response->message;
                $this->helper->debug('deleteContact', [$message]);
            }

            return $response;
        }
    }