Mark, we're making progress, and thank you for your help thus far!
I'm going to make the custom fields in SFDC and hopefully they automatically become available via Marketo form editor.
I understand your idea of passing URL params to the landing pages where, in theory, the custom fields will be populated with the URL params.. but I have a couple thoughts:
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How do you populate custom Marketo form fields with URL params?
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Most important: What if a visitor hits a form without query params (for whatever reason)? -- Wouldn't cookies be a better way of tracking this?
Example:
If cookies are NOT set.. set them via current query params.
On all subsequent visits... If utm_source is set, update the set of conversion cookies.
Then we can use the cookies values to populate the hidden fields.. is that possible?
The only issue then becomes the number of cookies we're setting & its effect on page load speed. Would be nice to set 1 cookie with all this information, then parse the cookie into the fields. That requires custom javascript which again I'm not sure if it's possible on Marketo landing pages?
This is fun
🙂 -- THANKS Mark & anyone else who wants to figure this out with me
🙂