Google (GOOG) on Monday announced that it will discontinue its prepaid card option on its Google Wallet platform in October. The Internet giant revealed that because users can now add any credit or debit card to the service, its prepaid cards are no longer necessary. Users will be unable to activate or add funds to an existing card starting on September 17th and all cards will be discontinued a month later on October 17th. The Mountain View-based company will allow users to request a refund if there are remaining funds on the card after it is discontinued.