QR can work if we had better scanning hardware. China is doing it with Alipay/Wechat for years but often with dedicated scanners where customer show their QR codes to pay. Using LNURL-withdraw this could be done with lightning as well.
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What's their effect? Do they scan more reliably and faster or is there some other benefit?
Phoenix Wallet for example had a 50% fail rate when we used it to pay at our local Meetup for no apparent reason. Maybe it was the weird light in that bar or some reflections by the bartender's smartphone display... 🤷♂️
We couldn't figure it out