How to design a checkout experience

Just do whatever Shopify does.
I'm astonished by the swiftness of their checkout experience.
It's so effortless that makes me worry about something went wrong.
One click, a fingerprint scan, done. Didn't need to type anything. Everything with one hand.
It's as good as the I don't need to take my wallet off solution for coffee shops mentioned in The Best Interface Is No Interface.

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