The information will be stored securely for NSW Health officials to access quickly if contact tracing is required.
Businesses are encouraged to use the app. The service is free and will help businesses comply with public health orders.
Around 400 businesses initially trialled the QR code check-in process, with the app passing an independent privacy review.
Close to 2.2 million customers have the Service NSW app on their mobile phones.
Minister for Customer Service Victor Dominello said customers should download the latest version of the app.
“Customers can already use their Service NSW app to complete a number of transactions, so it makes sense for them to be able to use it to check-in to venues as well,” Mr Dominello said.
Learn more about the COVID Safe check-in tool.