It depends on how your tool can take it in and communicate it. Usually the easiest way is to add a _fbc value to a hidden form field - so this data goes into CRM and is then available in the webhook. But it totally depends on your tool that you use for forms.
Also, note that you will need to pass the _fbc value from the parent window to the iframe for this to work correctly.
Iframes are always complicated 
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