If you downloaded 'Gran Saga Idle: KNIGHTS X KNIGHTS' through the Google Play Store,
You can set a payment password to prevent unintentional purchases.
How to set a Google Play Store payment password
- 1. Launch the Google Play Store and tap your profile picture on the right side of the search bar.
- 2. Select Settings > User controls > Require authentication for purchases
- 3. Select "Authenticate every time you make a purchase through Google Play on this device
- 4. Select "Set a payment password for your Google account