[Other]: Do we have API doc for this service?

[davidtao212]

What would you like to share?

Where can I find the API-doc for this service so I could get a full picture of how to use it? I didn't find the doc either in this repo or on the official documentation site.
Thank you.

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[xhc-code]

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[k88936]

I found a clue in the offical doc git history: issue of add chat doc but somehow they are removed later