[feature request] As a customer I want to pay by showing a QR code

[CabtonWithaK]

Context:
having a customer scan a lightning invoice with their camera is cumbersome.
It is easier for a customer to just present a QR code. This is also how Alipay/Venmo works and it is a very convenient way to pay.

Paying with a boltcard is basically letting a TPOS withdraw from a wallet.
Boltcards are expensive hardware.
It would be cheaper to let the customer present a QR code (lnurlw) to the TPOS. This way, no hardware is needed!

feature:
As a user I can pay by just showing a QR code (e.g. a LUD17 QR code from the withdraw links extension).
As a merchant I can choose 'scan' button on checkout, to charge the amount.

Additionally:
A separate LNBits core feature request could describe how, similar to LUD17 withdraw QR code, a user can set withdrawal limits and have easy access to this QR code via their wallet

[talvasconcelos]

Honestly I'm not a fan of this! I think it creates some friction for the merchant.

I'd like to assess if there's actual demand for this from the users before implementing something like that.