Mobile app redemption:
Open the Google Play app
At the top right, tap the Profile icon
Click on Payments & Subscriptions, then Redeem code.
Enter the code and you’re all set!
Web browser redemption:
Go to http://play.google.com
In the top right, click on your profile icon
Click on Payments & Subscriptions
Under Payment methods, click on Add a payment method
Chose Redeem code and enter the code and pin
When funds have been added to your Google Account Balance this can then be used to pay for all the different services by choosing it as a payment option.
Redeeming the gift card during Check-out is also possible both in the Google Play app and in the browser
When redeeming a gift card for the first time on your account, Google might ask for information about the gift card and its origins. It should be sufficient to send them a screenshot of the confirmation email you get from us after the purchase and a screenshot of the gift card code and pin you find when unsealing the card.