If you no longer wish to use a particular payment method on your gaming device, follow the steps below based on your operating system.
iOS (Apple Devices)
To remove your payment method (especially if you're using iOS 10.2 or earlier):
Open Settings and go to iTunes & App Store
Tap your Apple ID, then tap View Apple ID (sign in if prompted)
Tap Payment Information
Select None to remove your payment method
If you don't see the "None" option or can't select it, refer to Apple Support
Tap Done to save your changes
Android (Google Play)
To remove a payment method linked to your Google account:
Open the Google Play Store app
Tap the Menu (≡) icon and go to Account
Under Payment methods, tap More payment settings
Sign in to payments.google.com if prompted
Tap the payment method you want to remove
Tap Remove > Yes, remove it
The payment method will be removed from your Google account
These changes will apply across all services linked to your Apple or Google account, including in-game purchases.