Empty fields

Leave out any optional field you don’t use. If your tool sends it anyway, as null or "", Salesteam reads it as not set. That’s what Make does with a field left empty. List fields such as campaignIds also accept [] in the same way, or a comma-separated string. In customFields, an empty value leaves the field as it is, and null clears it. To empty a lead’s field with PATCH, list it in clear.