I have integrated a 3rd party web form with the instructions on this page  https://www.zoho.com/crm/help/google-adwords/configure.html

The GCLID is being added correctly to the Lead when I am using insertRecords API call. The form integration sometimes uses updateRecords but this does not update the GCLID field.

Can the GCLID field only be included when creating a new record?

Thanks,

Michael