Google External Authentication allows user accounts to login to your website using Google to securely authenticate their account. This means that if they are already logged into Gmail for example, they can simply click their way through the GrandNode login screen – no username or password is explicitly required! It's one of the easiest way to login in different stores.
It's perfect way to improve your users experience on mobile. No more long passwords or logins, just click "Login with Google" and purchase.
Plugin is available for FREE.