public function postAddressBookContacts($addressBookId, $apiContact)
    {
        $url = $this->getApiEndpoint() . self::REST_ADDRESS_BOOKS . $addressBookId
            . '/contacts';
        $this->setUrl($url)
            ->setVerb('POST')
            ->buildPostBody($apiContact);

        $response = $this->execute();

        if (isset($response->message)) {
            $message = 'POST ADDRESS BOOK CONTACTS ' . $url . ', '
                . $response->message;
            $this->helper->debug('postAddressBookContacts', [$message]);
        }

        return $response;
    }