I've found that HubSpot forms are capable of capturing things like UTM parameters and GCLID via hidden fields; with all the changes with Apple iOS and how it's effecting Facebook and Google ads, has anyone been able to capture other needed fields (such as IP address, useragent, FBCLID, FBPLID, etc.) in order to successfully set-up both Facebook's Conversion API and Google Measurements?
There are 12 default properties provided by HubSpot to identify the source of contact deeply. In this link, you find the explanation for all the default properties by HubSpot:
And these 12 properties are automatically captured by HubSpot and your UTM's are captured in "Original source drill-down 1" & "Original source drill-down 2" properties.
Now coming to your query you asked for a hidden field, yes there is a feature in HubSpot but the fields you asked for are automatically filled by HubSpot, so your question looks a little contradictory to me. 🤔
It's still, however, hasn't answered all of my questions - I see specifically that HubSpot now doesn't capture IP address; and I still need to capture the other parameters not mentioned in the article (useragent, fbp) too.
Really, the long game is that with the changes with iOS, I'm looking for a CRM that can capture what's needed to sucessfully set up Facebook Conversion API and Google Measurement Protocol. I'd love to hear from anyone who has been able to do it with Hubspot!