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

            return $this->execute();
        }
    }