You can redeem a Google Play Gift Card on your Android device, Google Play website, or Play Store app.

Method 1: Redeem via Google Play Store (Android)

1. Open the Google Play Store app on your device.
2. Tap your profile icon (top-right corner).
3. Select "Payments & Subscriptions" → "Redeem Code".
4. Enter your gift card code and tap "Redeem".
5. The balance will be added to your Google Play account.

Method 2: Redeem via Google Play Website

1. Go to Google Play Redeem Page. 
2. Log in to your Google account.
3. Enter your gift card code and click "Redeem".
4. The balance will be added to your account for purchases.

Method 3: Redeem During Checkout (For In-App Purchases)

1. When making a purchase on Google Play, select "Google Play Balance" as the payment method.
2. If prompted, enter your gift card code.
3. Confirm, and your gift card balance will be used.

Important Notes:

• Google Play Gift Cards are region-locked, so ensure they match your account's country.
• You can use the balance for apps, games, movies, books, and subscriptions.
• Check your balance anytime in Google Play Store → Payments & Subscriptions → Payment Methods.