JSFiddle - React, Tailwind, and code Playground

HTML

<html>
<form action="" method="post">
<input type="radio" name="paid" value="0" checked="checked"/>No<br>
<input type="radio" name="paid" value="1"/>Yes
</form>

<?php 
$paid = $_POST['paid'];
echo $paid;
?>
</html>

JavaScript

$('input[name=paid]').change(function(){
     $('form').submit();
});