Hi Greetings,
Hope you're doing great as per your requirement and the description say I'm not able to clearly understand your object. As for if you need a hand in Unity for integrating google play service I'm the right one here as I've 3 year of experience in Unity3d and has worked on all kind of plugin and service.
So Do let me know if you want help.
thanks.
Best Regards
Rinku Saru