The card you need, not the whole list
Apple Watch and Wear OS can show a card without unlocking the phone and scrolling the wallet. Home screen widgets do the same job on the phone: the barcode you use every week sits on the home screen.
Same wallet
The watch and the widget read cards from your CardWarden wallet. They are not a second copy you have to maintain. With Premium Cloud or Premium Family, a card added on the phone is the card the watch can show after sync.
Checkout is still one barcode
Widgets and the watch are a faster way to open a card. The cashier still scans the same barcode. If the card is already on the device, that works without a store connection.

