No, the app developer just needs to make the app ask to open a Bitcoin wallet when you tap the lnurl, which nostros already does, and I thought all apps did when you hit the zap button.
I am not exactly sure what you mean the no for.
What I know is, of course Nostr apps support lightning. This is by design.
The idea for this project was to make other websites, and social media apps support lightning without really touching their code. This way we could start to show people the power of lightning in the app they use, and then, we can show, that in Nostr it is even cooler with zaps.
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