Yes. You never need to share your primary Gmail or Facebook password. Create a separate Google or Facebook account, link it to your game, and use that account for Packsify orders. We only ever access the account that is linked to the game.
How to start
Create a new Google or Facebook account.
Open Settings in your game, tap Account, then Link Account.
Link the new account to your game.
Add that account in the Packsify app under Game Accounts.
Your game progress stays exactly as it is.