How to make Microtransactions with the Steamworks in my game (C#)?

I didn’t find any video tutorials on the internet on how to do this, I read the Steamworks documentation but so far I haven’t understood how to implement most of the things.

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I really want to know too,
I see a “Little Heroes Idle”
game made of Unity on Steam
also have Steam IAP too,
But I still can’t contact
to ask them how to do it…