Okay, This is only for PAID APPS and not for getting balance in your account so don't ever think of that but it's still useful for you trust me brother.
You can get redeem codes for specific paid apps/songs/books on the play store and you can find new codes every day so you better be updated to catch them first!
Link to the website:- https://www.play-code.xyz
Once you enter that website, Go to "Recent Promotions"
Down below you will find a lot of apps and the ones with red "Claimed" on them are not available and the ones with "view codes" are available for you! Make sure you open the "Visit" in a new tab and then go back to the main page and hit "View codes" then down below you will see a lot of codes. Choose one and enjoy.
To use your gift card, gift code, or promo code
- Open the Google Play Store app
2.Tap Menu = Redeem
3.Enter your code
4.Tap Redeem.
Enjoy!