To redeem a Google Play code on your PC, navigate to play.google.com/redeem on your web browser, log in to your Google account, enter the code, and click “Redeem”. Review the account details and confirm the redemption.
To redeem a Google Play Store code on your Android phone, open the Google Play app, tap your profile picture, then go to Payments & subscriptions > Redeem gift code. Enter the code and tap Redeem, then confirm.