private void Start()
{
GooglePlaySignIn.onClick.AddListener(gpm.TestAuthLogin);
GooglePlayLeaderboard.onClick.AddListener(gpm.TestShowLeaderboard);
GooglePlayAchievement.onClick.AddListener(gpm.TestShowAchievement);
AddLevelPoints.onClick.AddListener(() => gpm.OnUpdateClearedLevel(0));
UpgradeAvatar.onClick.AddListener(() => { gpm.UnlockAchievement(1, 0, true); });
}
