If you're using Shogun (https://apps.shopify.com/shogun ) built templates for your product or cart templates, please be aware that you will only be able to add our code snippet to those templates if you have the PAID version of Shogun.
To add our code to your product template, create a custom liquid element with these instructions: https://getshogun.com/help/en/articles/1391680-creating-custom-elements-with-liquid-css-and-js and then embed our snippet to the end of your product template (or wherever you need it)
If you run into issues. Get in touch!