Tealium
If you are using Tealium as your website tag manager you will want to follow the below instructions to add the CartStack tracking snippet to your account.
1. Log into your CartStack account and navigate to the code/setup page. On this page, select your website platform in the dropdown list. Then copy your unique Tracking Code snippet from #1 under the installation instructions.
2. Now log into your Tealium tag management portal and follow the "Custom JavaScript Code Extension" instructions found here - https://community.tealiumiq.com/t5/iQ-Tag-Management/JavaScript-Code-Extension/ta-p/11925.
You will want to make sure the CartStack tracking code loads in the head area of your website on ALL pages.