Plus you can make nostr events to represent anything. For example, every song on nostr:npub1yfg0d955c2jrj2080ew7pa4xrtj7x7s7umt28wh0zurwmxgpyj9shwv6vg has a kind 1 nostr event. So my tool allows you to create static QR codes that can be used anywhere including live streams and people can scan and pay them easily with any lightning wallet.