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I need to check, using APPLE ID/GOOGLE Android ID, if the user really has paid to buy my app.
I have to avoid an user use a cracked app (jailbreak)
Is there a “public key” unique for each app? I can use that (if exist) to check the unifier of my app
In short: No. You do not have access to this information via the API, but as others have said, you can roll your own solution via in-app purchases and your own server. If your concern is that unlicensed users will consume server bandwidth or other expensive resources, I’d suggest doing this.
If your end goal is just to prevent piracy, though, I’d suggest googling some of the off-the-shelf anti-piracy solutions available today. Even then, however, I would not expect miracles. I have implemented as many anti-piracy techniques as I can develop within a few of my own clients’ apps, but to date, none of them remain “uncracked.”