Google Wallet is an ambitious mobile payment plan designed to let your Android smartphone be your wallet. Google understands the inherent security risks of storing credit card information. But, at the end of the security chain is an “authorized” Android app, and that is the Achilles heel of Google Wallet security. Even with a strong PIN in place, if there is one Android app that can access the encrypted credit card data and process payments, then it is possible for malicious developers to create other apps to access that sensitive data.”]
Source: https://www.csoonline.com/article/2128614/google-wallet-security-has-a-weakness.html