Google Authenticator App

Afternoon All, 

Apologies if this is the wrong place to post, or if this is a bit of a noob questions, but I'm struggling to find any information really.

Im trying to figure out if i can use the Google Authenticator App for my Authentication Server, im trying to use a mobile phone code rather then a hardware token.

Am i looking at this wrong, is this even possible?

Im assuming i need to add something into the server as i would with the hardware token, but not sure how i do that

Any advice or if anybody could point me in the right direction i would really appreciate it.

Thanks