Deletes an extended field.
The deleteExtendedField() function returns a Promise that resolves
when the specified extended field is deleted.
When an extended field is deleted, any contact data stored in the field is permanently deleted as well.
Note:
Only visitors with
Manage Contacts permissions
can delete extended fields.
You can override the permissions by setting the suppressAuth option to true.
Extended field ID.
Authorization options.
This method doesn’t return any custom errors, but may return standard errors. Learn more about standard Wix errors.