Applies fallbackFields for the given UDM.
For example, for contacts UDM: if we have email in fields, but not primaryEmail, we will populate primaryEmail from the first value of `emails.
contacts
email
primaryEmail
You can see fallback fields in the corresponding UDM definition.
Applies fallbackFields for the given UDM.
For example, for
contactsUDM: if we haveemailin fields, but notprimaryEmail, we will populateprimaryEmailfrom the first value of `emails.You can see fallback fields in the corresponding UDM definition.