A new update for the Google Wallet app brings in support for security-related features such as Google Account PIN and fingerprint authentication.In addition to letting you add your fingerprint for authentication purpose, the Google Wallet app also lets you use the universal PIN system to stay secured. This is known as Google Account PIN and it works across all the Google applications. This way, you need not remember a separate PIN to access your Google Wallet.Unfortunately, previously the Google Wallet app – that demands to be highly secure – has been missing out on the fingerprint authentication feature.