'Steam WEB API for codes

I am trying to found how it looks API for requesting Steam product keys, so anybody can give me some documentation or give me some example? When I do inspect element and see how it looks url from Network section, https://partner.steamgames.com/apps/requestkeys/{GameID} it is not so relevant in my use case, because I can't see how request looks like or which authorization is using. Maybe there is no way how to get Steam product keys via API, don't know... I will use Postman for development. For now when I use Postman I am getting 403 status code.



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