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I checked the FB help page on how to use the "Retargeting Pixel" https://www.facebook.com/business/a/online-sales/custom-audiences-website.
As per there requirement the code should be pasted with in the <head> ... </head>" tags. This is what their guide says:
Place the pixel code provided by Facebook across your web pages. To do this, copy 100% of the pixel code from the Create Web Remarketing Pixel box, and paste it between the <head> and </head> tags on all pages of your website. Or, send the pixel code to your website developer.
I believe you can achieve your requirement by creating your own custom page and add the "Retargeting Pixel" code within the <head> tag of your page. You can then use this page in our custom thank you URL. The following guide should help you:
Hope this helps. Let us know if you need further assistance.
Thank you for your prompt response. How do I add the Pixel Code on the original JotForm Form in the Header Tab?
Unfortunately, this cannot be done within our system since it doesn't allow the use of custom scripts. You would need to add the script to your website to make it work. As mentioned by my colleague, you could use the custom thank you page redirection in your form to redirect your users to a page that includes the pixel script.
If you've further questions, please let us know and we'll be happy to help.