How to call index.php?option=com_payplans&view in PHP(or Java)?

How do I call plans in PHP (or Java)?

Yeah I know, users can create their own div wrapper around playplans (https://stackideas.com/docs/payplans/administrators/customizations/pricingpage).

But I'm looking for a way to call already generated Payplans.
You have them in Menu by link :

index.php?option=com_payplans&view=plan&task=subscribe&plan_id=0&group_id=0

So I tried

<?php

$FileContents = file_get_contents("*your domain*/index.php?option=com_payplans&view=plan&task=subscribe&plan_id=0&group_id=0");

echo $FileContents();

?>

It does work but also gives me footer and menu, because I call for a whole page. =)
There should be an easier way to call them same way menu does...?