private function getMail(array $entry)
    {
        if (empty($entry['billingAddressData']['options'])) {
            return null;
        }

        $options = array_filter($entry['billingAddressData']['options'], function (array $option) {
            return $option['typeId'] === 5;
        });

        if (empty($options)) {
            return null;
        }

        $option = array_shift($options);

        return $option['value'];
    }
private function getMail(array $entry)
    {
        if (empty($entry['billingAddressData']['options'])) {
            return null;
        }

        $options = array_filter($entry['billingAddressData']['options'], function (array $option) {
            return $option['typeId'] === 5;
        });

        if (empty($options)) {
            return null;
        }

        $option = array_shift($options);

        return $option['value'];
    }
@param array $entry

@return null|string