The External Surveys ( a.k.a Mystery Shopper) tool allows Administrators to create limited access accounts for external users that lets them log in and complete surveys and questionnaires.
These can be used to allow Mystery Shoppers to log on and complete predefined surveys on stores, or for External Suppliers to provide feedback.
The account credentials provided will only allow the users to access the surveys that have been associated with those accounts, and they won't gain access to any other part of your platform.
Check out the video below for more information.