Yes, you can remove your card or used vouchers from your wallet at any time. You can re-add at any time.
Apple: Open the app, tap the specific loyalty card, tap the “More” button (3 dots), select “Pass Details” and choose “Remove Pass”.
Google: Open the app, swipe to find and tap the specific loyalty card, tap the three-dot "More" menu in the top right, and select "Remove".
The Digital Wallet is currently only available in South Australia.