When using the app while visiting a Westfield centre, location information is needed to deliver in-app benefits such as the ability to check your parking time and set a reminder when in centre.
When you drive a shared vehicle to a Westfield centre, if the people you share the vehicle with are also at the centre, they will be able to see that the vehicle is parked at the centre in their Westfield app. They will not be able to see the exact location of the car in the car park. If they are not at the centre, they will not be able to see this information.
Your exact location information is not shared with the people you share a vehicle with at any time.