https://github.com/0xchat-app/0xchat-core/blob/main/doc/nofitications.md
Push notifications spec used by 0xchat
When you do re-write it, consider:
https://github.com/nostr-protocol/nips/pull/1796
https://github.com/coracle-social/anchor
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will do :)
I'm not sure it actually makes sense for the push stuff to be interoperable since you need server keys anyway, but maybe the code will be useful