In reply to Mike.

Interesting …

“Pay for purchases by pressing the button on the LoopPay device, or open the LoopPay app and select the card of your choice and Tap to Pay.”

But, “Tell the merchant which card you will pay with” … Sounds like the phone is not necessary, and LoopPay is also some sort of “dongle” device.

And, “LoopPay’s sleek new CardCase attaches to your smartphone with a convenient storage compartment for an ID and backup card. The handy LoopPay Card can be removed from the case to hand to a waiter or clerk so you can hold onto your smartphone.”

The reviews at view at …
https://play.google.com/store/apps/details?id=com.looppay.wallet
are not so encouraging; sounds a bit clunky—best not leave your wallet and cards at home, just in case; and, I suspect the police officer may want to see the original drivers’ licence …