<?php

namespace PhpOffice\PhpSpreadsheet\Writer\Pdf;

use PhpOffice\PhpSpreadsheet\Worksheet\PageSetup;
use PhpOffice\PhpSpreadsheet\Writer\Html;
use PhpOffice\PhpSpreadsheet\Writer\Pdf;

class Mpdf extends Pdf
{
    /** @var bool */
    protected $isMPdf = true;

    /**
     * Gets the implementation of external PDF library that should be used.
     *
     * @param array $config Configuration array
     *
     * @return \Mpdf\Mpdf implementation
     */
    protected function createExternalWriterInstance($config)
    {
        return new \Mpdf\Mpdf($config);
    }

    /**
     * Save Spreadsheet to file.
     *
     * @param string $filename Name of the file to save as
     */
    public function save($filename, int $flags = 0): void
    {
        $fileHandle = parent::prepareForSave($filename);

        //  Check for paper size and page orientation
        $setup = $this->spreadsheet->getSheet($this->getSheetIndex() ?? 0)->getPageSetup();
        $orientation = $this->getOrientation() ?? $setup->getOrientation();
        $orientation = ($orientation === PageSetup::ORIENTATION_LANDSCAPE) ? 'L' : 'P';
        $printPaperSize = $this->getPaperSize() ?? $setup->getPaperSize();
        $paperSize = self::$paperSizes[$printPaperSize] ?? PageSetup::getPaperSizeDefault();

        //  Create PDF
        $config = ['tempDir' => $this->tempDir . '/mpdf'];
        $pdf = $this->createExternalWriterInstance($config);
        $ortmp = $orientation;
        $pdf->_setPageSize($paperSize, $ortmp);
        $pdf->DefOrientation = $orientation;
        $pdf->AddPageByArray([
            'orientation' => $orientation,
            'margin-left' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getLeft()),
            'margin-right' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getRight()),
            'margin-top' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getTop()),
            'margin-bottom' => $this->inchesToMm($this->spreadsheet->getActiveSheet()->getPageMargins()->getBottom()),
        ]);

        //  Document info
        $pdf->SetTitle($this->spreadsheet->getProperties()->getTitle());
        $pdf->SetAuthor($this->spreadsheet->getProperties()->getCreator());
        $pdf->SetSubject($this->spreadsheet->getProperties()->getSubject());
        $pdf->SetKeywords($this->spreadsheet->getProperties()->getKeywords());
        $pdf->SetCreator($this->spreadsheet->getProperties()->getCreator());

        $html = $this->generateHTMLAll();
        $bodyLocation = strpos($html, Html::BODY_LINE);
        // Make sure first data presented to Mpdf includes body tag
        //   so that Mpdf doesn't parse it as content. Issue 2432.
        if ($bodyLocation !== false) {
            $bodyLocation += strlen(Html::BODY_LINE);
            $pdf->WriteHTML(substr($html, 0, $bodyLocation));
            $html = substr($html, $bodyLocation);
        }
        foreach (\array_chunk(\explode(PHP_EOL, $html), 1000) as $lines) {
            $pdf->WriteHTML(\implode(PHP_EOL, $lines));
        }

        //  Write to file
        fwrite($fileHandle, $pdf->Output('', 'S'));

        parent::restoreStateAfterSave();
    }

    /**
     * Convert inches to mm.
     *
     * @param float $inches
     *
     * @return float
     */
    private function inchesToMm($inches)
    {
        return $inches * 25.4;
    }
}

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                        Request Example (guzzle)
                        

                        
                            
<?php
                            
 require_once('vendor/autoload.php');
                            
 $client = new \GuzzleHttp\Client();
                            
 $response = $client->request('POST', $base_url. 'v1/generate-token', [
                            
'headers' => [
                            
  'accept' => 'application/json',
                            
  'content-type' => 'application/json',
                            
 ],
                            
'form_params' => [
                            
  'client_id'     => '$client_id',
                            
  'secret_id'     => 'secret_id',
                            
  'env'           => 'env',
                            
  'merchant_id'   => 'merchant_id',
                            
 ],
                            
                            
]);
                            
echo $response->getBody();
                        
                    
                

                    
                        
**Response: SUCCESS (200 OK)**
                        
{
                        
 "message": {
                        
 "success": [
                        
  "Successfully token is generated"
                        
 ]
                        
},
                        
"data": {
                        
 "token":"eyJpdiI6InpkczhjTjhQdVhUL2lKQ0pSUUx6aUE9P
SIsInZhbHVlIjoiVGVBTVBDTXltbjNZcEIvdEJveGpTSno3TU5NRUtn
VkhCZ1pHTFNCUnZGQ2UxMnYxN202cEE1YVRDTEFsc0ZERExoTjdtL0dTL2x
oU3QzeUJJOExiMUx5T0w1L0llUXhTUkU1cWVLWEdEbEplb0dKNXcwbTNRM0
VxdkUwYzZuNFdtNkhMQ0pRZysyNWkvdzBxSlBoSVBSOGFTekNnR2RXNHVtc
G9lMGZOTmNCcm1hR3c5Sk9KTnB4Y3ltZDl6cm90MThrR21Ca3B1azc3bXRi
Q0J6SW96UVo1elNkU1ZqeE05bTcwWGp1MEUxWlJFdnNWTmpSbnVpeW92b2U
4dXZkUGgyb1VmK0luaGdyaFlsVTZlcVpVRnZlTG1DeFF6Ykk2T2h6Z3Jzbn
IyNHpNdHowSE5JdDR0Y0pZT20zUm1XYW8iLCJtYWMiOiJlY2M4NGE1OGUzYz
kzYzk0YzljNmVmNjE0YWI0ZDIwOGI3NDQ2YWEyY2ZhNzc0NzE4ZmY1ZmYyMz

                        IyZmQzNDY1IiwidGFnIjoiIn0=",
                        
},
                        
"type": "success"
                        
}
                    
                

                    
                        
**Response: ERROR (400 FAILED)**
                        
{
                        
 "message": {
                        
 "error": [
                        
  "Invalid credentials."
                        
 ]
                        
},
                        
"data": null,
                        
"type": "error"
                        
}