I had an idea to create a tip jar using nostr native tools, but I think it might be too advanced for new coiners.

https://habla.news/u/bloggingbitcoin@iris.to/the-nostr-tip-jar

I suggest onboarding each bartender onto minibits.cash wallet.

Each 12 word wallet is also a nostr key so you can pay them like venmo right away. It is cuatodial like WOS, but uses cashu + lightning.