Pay with a Like without Shortcode

I'm trying to use Pay with a Like to unlock access to a 3rd-party classified ad submission page.

the way that plugin works there isn't one specific page where I can insert shortcodes, it generates pages dynamically

website.com/submit-listing/?level=3

is there a way to Pay-with-a-Like a page like that maybe inserting code into functions.php ?

if I knew what to use for Pay-with-a-Like code I can probably find where to maybe put it into classifieds plugin functions / template