Unknown API (finding reference)

Ran into a project:

Found two calls:

With the API prefix, look not like v5 / new API to me; maybe v3?
I hope translate it to use new API.

First step I’d like to find references for those calls.
However, did not manage to do so.
Can anyone give some hints?
API reference / new-equal API
Appreciate any input

Thank you.

They’re not 3rd party APIs and not supported for use by 3rd party applications.

thanks @3ventic.
So the developer did research on official workflow

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