I developed the following test app to understand and share how to implement Google Play Games Services for Android.
GPSGTester code on github – This test app project implements all the features of the Corona SDK Google Play Game Services (Legacy) Plugin.
Now that Google Play Game Services is required by Google to qualify your game for the Google Play Store Indie Conner it’s more important than ever to integrate GPGS into your Corona SDK games.
Screen shot of GPGSTester main menu: