<?php
$client = new Client();
$headers = [
  'Authorization' => 'Bearer <YOUR API KEY>',
  'Content-Type' => 'application/json'
];
$body = '{
"page": {
  "pdf": {
    "printBackground": true
  },
  "goto": {
    "url": "https://www.spacejam.com/1996"
  }
}
}';
$request = new Request('POST', 'https://api.doppio.sh/v1/render/pdf/sync', $headers, $body);
$res = $client->sendAsync($request)->wait();
echo $res->getBody();