Yes. Packsify buys official Apple and Google gift cards, and that credit is used to buy packs directly in your account through the standard official store process. There are no hacks, no third party tools, and no exploits. We follow strict encrypted handling security rules.
We use the login you added in the app to sign in to the game, buy the packs you ordered, then sign out and remove the account from the device. We access nothing else.
Please check the full list in What Packsify never does inside your account.