public function deleteContactsTransactionalData(
        $key,
        $collectionName = 'Orders'
    ) {
        if ($key && $collectionName) {
            $url = $this->getApiEndpoint() . '/v2/contacts/transactional-data/'
                . $collectionName . '/' . $key;
            $this->setUrl($url)
                ->setVerb('DELETE');

            $response = $this->execute();

            if (isset($response->message)) {
                $this->helper->debug(
                    'deleteContactsTransactionalData',
                    ['DELETE CONTACTS TRANSACTIONAL DATA : ' . $url
                        . ' ' . $response->message]
                );
            }

            return $response;
        }
    }