How do I make an http API request with the sample jsons shown in `$ keybase chat api help` ?

I read the API/1.0 docs, learned the login/lookup process but couldn't figure out how to use `keybase chat api help` or `keybase team api help` JSON data.

I tried making POST request to `https://api-0.core.keybaseapi.com/` with those sample jsons but that didn't work.

Start with the API/1.0 documentation and the examples from `keybase chat api help` and `keybase team api help`. Verify how those JSON examples are intended to be sent, including the correct request endpoint, then document a working HTTP example and confirm it addresses the reported POST failure.

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