It's nostr:nprofile1qqsyymc3xj8lpcld5t2mjpheed7ewsc8t2u9aweuzh2hlwqtfcj7c0spr9mhxue69uhhyetvv9ujuumwdae8gtnnda3kjctv9uqsuamnwvaz7tmwdaejumr0dshsd20fp2 's creation but it's very custom. Basically just need to listen to payments somewhere, save and display the info.

https://github.com/ericpp/scoreboard