We'll create fresh WordPress site with Google Plus Page shortcode installed. You have 20 minutes to test the plugin after that site we'll be deleted.
Add a Google+ Page button easily with this plugin. The shortcode is [googlepage]
Usage:
* Smallest icon: [googlepage page=YOUR_PAGE_ID]
* Medium icon: [googlepage size=32 page=YOUR_PAGE_ID]
* Biggest icon: [googlepage size=64 page=YOUR_PAGE_ID]
In page=x where x is your Google+ Page number.