/**
  * Get Quotation pdf by Quotation number
  *
  * @param integer $no
  * @param bool|false $download
  * @return bool
  */
 public function pdf($no, $download = false)
 {
     $handle = $this->getHandle($no);
     $pdf = $this->client->Quotation_GetPdf(['quotationHandle' => $handle])->Quotation_GetPdfResult;
     if (!$download) {
         return $pdf;
     }
     header('Content-type: application/pdf');
     header('Content-Disposition: attachment; filename="' . $no . '.pdf"');
     echo $pdf;
     return true;
 }