<?php
$challenge = $_REQUEST['hub_challenge'];
$verify_token = $_REQUEST['hub_verify_token'];

if ($verify_token === 'EAAKFkRWe0jMBAFov80btQ1yerfx4bNWLZCSZAtsa0Bvg1B8lhZAJHEnWiC9jEENnNtKQvyNrpOTxf6XGcM4ElE2mnoDMIdOZBTJfGfOqV4Y2qQWSEFrfNzDrway4szZC37ZAInmkup0NUfrpREZBwsauXXikuy59x4FXZBKVqFh60V7tHj7sJZANgOlxapW4r2MiamFUYvxqJqA1snMYmLFK8jlKyFpZBtzt25gsbVZBqhVZAAZDZD') {
  echo $challenge;
}
en_USEN