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
mobile phone cameras often don't have enough resolution for the amount of data in a lightning invoice. if the QR is only an LNURL like LUD16 you get less problems.
Switching to a different app on the same phone often worked though. So we swapped to ZEUS or WoS after Phoenix failed and those apps could often fetch the invoice 🤷♂️
Maybe Phoenix was just bad 😆
probably depends on the QR code library in use then also
oh yeah, most phones have a good scanner in the phone now. you can scan with the camera, copy, and paste into the lightning wallet and pay that way for this case. but try other LN wallets too, and if you love the one you have, bitch at the devs about the QR reader library.
I have never had issues with phoenix (on iOS) but it could be a camera issue. The scanner devices usually have a cone shape to reduce light falling in. When you turn the phone upside down to show your QR it reduces reflections.
