FancyMancy said:

People are getting more and more lazy. Will they want to be too lazy to get their phone out, so that they can wave their hand-full-of-microchip to pay for things in the shops instead?

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https://www.aboutamazon.com/news/retail/amazon-fresh-grocery-store-meet-just-walk-out-shopping said:

They can scan the QR code in their Amazon app, use Amazon One to scan their palm

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https://one.amazon.com/ said:

One way to unlock the world, powered by your palm.

Meet Amazon One, the fast, convenient, contactless identity service that uses your palm – just hover to enter, identify, and pay.

Simply by being you.

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Convenience, powered by you.
We created Amazon One to put the power in your hands and help you move seamlessly through your day.

An easier way to pay.
Pay for your favorite things in seconds using your palm and simplify your shopping experience.

Breeze through your day.
The arrival of Amazon One in stores and other venues means you'll move through checkouts and entry gates faster than ever.

Anytime. Anywhere.
Our goal is to unlock your world by giving you the freedom to pay, enter, and identify with nothing but your palm.

It's easy as 3, 2, One...
All you need to do is hover your palm.

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