I've just bought this, but before I did, I wasn't getting the option to integrate with Google - in Google integration options, I was getting the option to add my Analytics ID, and to enable the +1 button, but nowhere to add my Google app details. Since I wanted Tumblr and Github logins anyway, I bought this, thinking it might also fix the Google problem. It hasn't.
I realise this isn't a fault with this addon, but does anyone have any idea what i might have done to cause the problem?