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I would just assume that the vendor's payment app would just play a chime and maybe a readout of the amount received. Every payment app I've used has a notifica

I would just assume that the vendor's payment app would just play a chime and maybe a readout of the amount received. Every payment app I've used has a notification with name and total when I get money. I'm pretty sure Android can already handle this anyway. Connect the phone to a speaker if you need it louder. Seems like a much cheaper solution than buying a speaker with a built-in modem that you have to pay a monthly fee for unless you just don't own a smartphone.

macintux 4y ago
Not being a street vendor, I’d guess that you: A) definitely don’t want to leave a smartphone someplace easy to check B) don’t want to take the time to unlock your smartphone to see the notification C) do want something that can notify you without taking your attention away from three other customers