Yes, you need to be a Westfield member to access Westfield Reserved Tickets via the Westfield app.
Becoming a Westfield member is free and simple.
Download the free Westfield AU/NZ app and create an account.
1. Go to the App Store for Apple (iOS) / Google Play for Android
2. Search for "Westfield AU/NZ" and download the app
3. Open the Westfield AU/NZ app and follow the prompts to create your account.