The plan will be technology-agnostic, meaning that the government is not setting out in detail how each app must work. It argues that under the voluntary digital ID scheme, drinkers would share fewer personal details with a venue or shop - such as tapping their phone on a reader or displaying a scannable QR code rather than handing over an official document. The apps will also need to guard against customers borrowing devices from older friends and relatives, and ensure the ID app belongs to the person using it.