Taking theme backup

This step is optional but highly recommended. Duplicate the theme on which you want to setup the CSP app and keep it as a backup because in case some issue happens, you can go back and publish the theme backup quickly.

CSP App Setup for Product Page

Go to Themes from dashboard >> Actions >> Edit Code

In templates scroll down and open “product.liquid”, put this code to the bottom of your product.liquid template:

<div id= "hiddenProductId" style="display:none;" data-product-id="{{product.id}}"></div>

In case you have multiple product page templates in your store, you can put the code in all the templates for which you want to enable the product page swatches.

CSP App Setup for Collection Page

Open snippet “product-grid-item” and add this attribute to the div in first line as shown in the screenshot.
product-selector="{{ product.id }}">

Done!