If you are aged 18 or over you can apply for and use your $25 Dine & Discover vouchers anytime.
You don't need the Service NSW app to apply for them - you can do that online at service.nsw.gov.au - but you will need the four separate QR codes (which are easiest to read on the app, using a smartphone) to actually spend them.
To receive the four $25 vouchers you will need to apply online or at a Service NSW office and have your ID verified
Step 1: Register
It's much easier with an online MyServicesNSW account, otherwise you'll need to call 13 77 88 and/or go into a Services NSW office to verify your ID first.
To create an online MyServicesNSW account you need an email address and Australian mobile number to use for verification. This takes 5 minutes.
You need to log in to this account to begin.
On the Services NSW app, select vouchers, or if you are on the Services NSW homepage you'll need to scroll to find 'highlights', then come down to select 'apply'.
You need to verify two forms of ID online - you'll be prompted to allow your camera to scan your driver's licence and Medicare card, but if you don't have one of these, there are other options including passport and birth certificate.
Once these are scanned successfully, you will need to provide personal details such as address, phone number and email address.
Once submitted, the automated system should send you a note to say your vouchers are being processed and will arrive within one hour.