Apple’s ‘CarKey’ lets users send digital keys via Messages

Apple is working on a new “CarKey” feature that will allow an iPhone or an Apple Watch to unlock, lock, and start NFC-compatible vehicles, as first discovered in iOS 13.4 beta 1. Digital CarKey “keys” are stored in Apple’s Wallet app.
Juli Clover and Steve Moser for MacRumors:Apple CarPlayCarKey keys will be able to be shared with people in individual conversations but not in group conversations.
From iOS 13.4 beta 2: CarKey is not available in group conversations.