Looks like their API documentation finally got updated. Steps and Calories now should be in the daily data. It’s not clear what the HRV data is though.
You can access the 2.0.3 doc from this page:
There’s ‘HRV List’ which contains a HRV and HR value, so I assume that would be the snapshot???
And there’s HRV on it’s own, which might be the overnight HRV???