On the Shift4Shop dashboard, go to Settings > Design > 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 and click Save.
Send submit a ticket to Shift4Shop 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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