bip21 covers both bitcoin and lightning in 1 QR code but not all wallets support it yet. your best bet is have a lightning address + lnurl printed for LN. Use something simple like satspay plugin on lnbits or worst case a static bitcoin address.
I have been looking at BIP21 & am kinda wondering why this isn't supported across all wallets? It would really make bitcoin a lot more user friendly
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