$ch2 = curl_init();
    curl_setopt($ch2, CURLOPT_URL, "https://api.paypal.com/v1/checkout/orders/order_id_here");


    curl_setopt($ch2, CURLOPT_POSTFIELDS, $data);
    curl_setopt($ch2, CURLOPT_HTTPHEADER, array(
      "Content-Type: application/json",
      "Authorization: Bearer ".$json->access_token,
      "Content-length: ".strlen($data))
    );

    $result = curl_exec($ch2);