"I don’t see my HubSpot property in the dropdown."
For a HubSpot property to appear in Referral Factory’s field mapping dropdown, it must be set to Show in Forms in HubSpot. Properties that are hidden or internal-only will not appear. See: FAQ: Why aren’t my HubSpot properties populating in the integration mapping?
"I added a fixed value but the CRM field isn’t updating."
Check that the field type is compatible. For example, if the HubSpot property is a dropdown (enumeration), your fixed value must exactly match one of the defined options — including capitalisation.
"Do I need to map every field?"
No, but Email and First Name are typically required for the integration to send data. Additional field mapping is optional but recommended for richer data.