PDFShift config

pdf.php

<?php

require_once('includes/vendor/pdfshift/init.php');
use \PDFShift\PDFShift;

$pdfshift = new PDFShift( array( 
  'sandbox' => true,
  'viewport' => '768x1024',
  'zoom'     => 0.8,
  'css' => $this->get_pdf_css(), // custom function to get a url for the css file
) );

$pdfshift->setMargin( array(
  'top' => '25mm',
  'left' => '25mm',
  'bottom' => '25mm',
  'right' => '25mm',
) );

$pdfshift->convert( $content ); // content is this url: https://fcfgolivedev.staging.wpengine.com/tropical-business-class-bout-hawaii-vs-costa-rica/pdf/
$save = $pdfshift->save( $file_url );