This would be great, even in a basic form (eg we would be happy to use curl for transport).
We actually do have one, but we can only provide it to developers approved by Nintendo. I'd recommend creating a support ticket to get access.
Thanks Andy, we are indeed approved, so I'll get a ticket raised!
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Unity PlayFab SDK and Game SDK install fix
PlayFab Party SDK for macOS & Linux & cross-platform
PlayFab Party native C# SDK (not Unity)
Secure socket to custom game servers
PlayFab Party for Linux (specifically Custom Game Servers)
Add defines to the asmdef for Unity SDK