<?php
  $url = $_POST['pdf_url'];
  require 'autoload.php';
  use \Convertio\Convertio;

  $API = new Convertio("399a321fa788878e8852ad07e7710f01");           // You can obtain API Key here: https://convertio.co/api/

  $API->startFromURL($url , 'pdf')   // Convert (Render) HTML Page to PNG
  ->wait()                                          // Wait for conversion finish
  ->download('./investmnet-calc.pdf')                        // Download Result To Local File
  ->delete();
  ?>