On the 3dCart dashboard, go to Content -> Header and Footer
Paste the code snippet from the Code page of your CartStack account in the Global Header field with the WYSIWYG mode turned off.
Send submit a ticket to 3dCart and ask them to add *.cartstack.com to the Content Security Policy for your cart abandonment software.
Once *.cartstack.com has been added to the CSP, on the Code page of your CartStack account, paste the URL for the thank you page which loads after a purchase is completed and click "Review My Integration."
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