Add Google Play Game Services Leader Board to a Cocoas 2DX Game

Hello there, We've developed a game using Cocoas 2DX 2.2.2 called Modi Mania ([login to view URL]) We're facing an issue to integrate the Google Play Game Services Leaderboard into the game via Cocoas 2DX. I need urgent help to get this done. All one has to do is call the function of the Google Play Game Services Keyboard and pass the high-score data. We have the source code of the game and we've already created the Google Play Game Services Leaderboard. I would appreciate if an experienced Freelancer with past experience of how-to-get-this-done can immediately finish this for us.