Why you need to use a specific app and not any lightning wallet?
You need to use another LN app for the payment. However Qerko works as a substitution of communication with waiter. You can make an order and do the payment without talking to anyone.
It's great for introverts or even at places where the staff doesn't speak properly english.
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The standard for that is a QR code/NFC with a link to a web app with the menu and checkout.
No need to have any native app really.
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My guess is that businesses don't know they are using LN. They just get the fiat from within that app. Ends up being kinda of a non-event in terms of Bitcoin adoption/awareness.
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