Working example... yes...
... that I can allow you to access... no.. sorry.
I have a solution (.fp7) which uses a url with the variable address data which accesses PHP pages on my server which mmarks an origin and a destination on a google map then calculates distance by road and time estimates.
I have a problem with Windows with a google 'over query limit' error that loops and locks out the FM user... so I open a browser window.
On the Mac the result is shown in a web viewer and the time and distance values are added to the record. Windows users have to transfer the values manually until I can shed the google error.
google references for the API are a bit overwhelming. The forum is helpful to some extent but there is a (techno) language barrier.... you have to know the jargon and finding responses from FM people is rare.
I got that part (directions) to work properly on my credentials, but the issue is for users to make this work on their own google account. If I use a single account for all my clients it will max out with 2500 queries / day. And you are right, the google refs are overwhelming.