Google Play cards can be redeemed via the Google Play Store on either a mobile device or on a computer. The cards can be added to an account balance by selecting the Redeem option in the Google Play Store or while making a purchase by selection Redeem at the checkout.
To redeem a Google Play card and add it to an account balance on a mobile device, open the Google Play app and log in if necessary. Tap on the menu icon to open the menu and tap on the Redeem option. Enter the code displayed on the Google Play cars, and tap enter. The amount of credit on the Google Play card will then be transferred to the Google Play account's balance. To do the same on a computer, navigate to the Google Play Store using a web browser, click menu, select Redeem and enter the code on the Google Play card.
Some Google Play cards can only be redeemed against certain apps or digital content. If this is the case, find the app in the Google Play Store and proceed to the checkout section as normal. In the checkout, select Redeem from the drop down payment options. Enter the Google Play card number and follow the on screen instructions to complete the purchase.