Reusable payment codes, specifically BIP 47/PayNyms: https://foundationdevices.com/2023/02/making-sense-of-stealth-addresses/
jb55 Is there a known issue with sending a zap privately? When I tried to zap Seth here I received an “error fetching Lightning invoice”
May just have been momentary, try again? Mine is a self-hosted BTCPay + CLN setup, should receive tips/Zaps just fine but won't show on Nostr due to a lack of NIP-57 support.