I have a list of regions that are attached to specific postal codes that need to be attached to each survey response. Since Supplemental data is still in process of being launched, I am using the authenticator to achieve this. An issue using the authenticator is that the contact record will be updated with the ED fields captured from the survey response. 

Is there a way to use the authenticator without updating the contact record? In this case, each postal code contact record is a place holder for anyone who takes the survey as this is an anonymous survey. The postal code contact records can not be updated as it will interfere with the response in general.