code: protected function convertTicketType($optionsTicketType)
      {
          $converted = null;
  
          $map = [
              FarePricePnrWithBookingClassOptions::TICKET_TYPE_ELECTRONIC => AttributeDetails::OVERRIDE_ELECTRONIC_TICKET,
              FarePricePnrWithBookingClassOptions::TICKET_TYPE_PAPER => AttributeDetails::OVERRIDE_PAPER_TICKET,
              FarePricePnrWithBookingClassOptions::TICKET_TYPE_BOTH => AttributeDetails::OVERRIDE_BOTH_TICKET,
          ];
  
          if (array_key_exists($optionsTicketType, $map)) {
              $converted = $map[$optionsTicketType];
          }
  
          return $converted;
      }
docs: Convert new codes (Price PNR version 13+) to old format
  
  @param string $optionsTicketType
  @return string|null