Is there a way to make hubspot - API always add an id that i gave during authentication to it's usual response? - basically, a functionally very similar to apex classes in salesforce
That's not currently possible with the HubSpot API; I can totally see the use case for that, though; If you have the inclination, I would encourage you to check out the Ideas Forum on the HubSpot Community. There, you can create a post including your use case that product and other customers can see. This is where HubSpot is aggregating all product feedback, so it's the best place to get your suggestions seen.