Problem inserting external web form into wix page with script tags

According to the vendor I’m working with, in order for this external form they’ve prepared for me to function I need to put the following code into my site:

<script type='text/javascript' src='//'></script> 

After fiddling around with inserting it into an $w.onReady function(){, I’ve run out of ideas.

What’s the correct way to proceed to get this to form to show up on a page?

You are trying to attach an external JavaScript file to your WIX Project, and there are only 2 ways of doing this, either with an iFrame (that you attach a hole page inside of your WIX Page) or a Custom Element (that you can insert custom HTML tag and files), and it will depend on your use to know which one to use.