Fetching Contact IDs from CRM to Creator

I want to create and make updates to Contacts in Zoho CRM through Creator forms. So that if the form is filled out and submitted they are added to our Contacts in Zoho CRM or updates a Contact already present.

For updates, I need the Contact ID from CRM. How can I fetch the Contact ID from Zoho CRM to Creator and provide it in the update Deluge?

Or can another identifier be used to verify if it is a new contact, i.e. email address?

The fetch record instructions seem to only give me help with fetching all the Contact List info.