A combination of legend.lnbits.com and qrcode-monkey.com LNbits has a LNURLw extension that let's you create vouchers!

I can't seem to get the legend.lnbits.com lnurlw to work. I generate qr codes and when wallets try to redeem is says server not responding. Any tips?

I've had similar issues. Try a different wallet. For some reason certain wallets can't connect. Maybe there is no lightning path or something.