Manychat Checkbox GT Script – Clickfunnels
<script>
$(document).ready(function(){
$('form').submit(function(){
MC.getWidget(YOURNUMBERHERE).submit();
});
});
</script>

Manychat Checkbox GT Script – WP and other sites
The code must be specifically put inside the <form></form> tags. The site needs to be using jQuery, which WordPress and most sites already do.

<!-- START Bot Academy Script: Form specific -->
<span class="bot-academy-attach-to-this-form" style="display:none;"></span>
<script>
(function($){
$(document).ready(function(){
$('.bot-academy-attach-to-this-form').closest('form').submit(function(){
MC.getWidget(REPLACE-WITH-WIDGET-ID).submit();
});
});
})(jQuery);
</script>
<!-- END Bot Academy Script: Form specific -->

Manychat script – non jQuery
If the code doesn’t work it’s likely because they don’t have jQuery added to the site.
Try to add this line of code above the <–ManyChat –> script that goes on all pages of your website

<script
src="https://code.jquery.com/jquery-3.3.1.slim.min.js"
integrity="sha256-3edrmyuQ0w65f8gfBsqowzjJe2iM6n0nKciPUp8y+7E="
crossorigin="anonymous">
</script>