Firebase Auth & Security Upgrade

My Firebase project has hit a wall with Google’s latest security review. The hold-up is entirely on the authentication side. At the moment the app signs users in exclusively through Google (social login), and the platform is flagging gaps that must be closed before it will allow a new release... (Budget: $10 - $30 USD, Jobs: API Development, App Development, Google Cloud Platform, Mobile App Development, OAuth, Security, Software Development, Web Development)