public function mergeContactIntoAddressData(array &$addressData, ContactInterface $contact)
    {
        $addressData['firstName'] = $contact->getFirstName();
        $addressData['lastName'] = $contact->getLastName();
        $addressData['fullName'] = $contact->getFullName();
        $addressData['salutation'] = $contact->getSalutation();
        $addressData['formOfAddress'] = $contact->getFormOfAddress();
        if ($contact->getTitle() !== null) {
            $addressData['title'] = $contact->getTitle()->getTitle();
        }
    }