public function formatContactDetails(ClientContactDetailsInterface $details, $lineSeparator = self::LINES_SEPARATOR)
    {
        $lines   = [];
        $lines[] = sprintf('%s %s', $details->getFirstName(), $details->getLastName());
        $lines[] = sprintf('%s %s', $details->getPhone(), $details->getSecondaryPhone());
        $lines[] = $details->getEmail();
        
        return implode($lineSeparator, $lines);
    }