Open the Google Play Store app
Tap your profile icon
Tap Payments and subscriptions
Tap Payment methods
Check whether Google Play balance is available in your country and account
Add a supported payment method if needed
Redeem a Google Play gift card or promo code
Tap Redeem code in the Play Store
Enter the code and confirm
Use the balance for eligible purchases in Google Play
Check your balance in Payments and subscriptions or at payments.google.com