My wife bought a £10 gift card code from cdkeys.com for my child's account to put on his new mobile phone, I tried to redeem it on the Google Play Store as I administer his email account and Play Store account. Google refused to redeem the card and asked for more information, all of which was sent. Google replied they would not redeem the card and now won't answer any emails. I thought I'd try and add a debit card to his account as Google stated the reason why they would not redeem the gift card was account discrepancies. No surprise Google was happy to add the card and take money from it, so obviously just typical greed as if that was issues with the account why would would a debit card be allowed.