Download this Unity package and see demo for usage

• Step 1: Download & install Facebook plugin for login
  Download
  
  
• Step 2: Download & install the leaderboard package below
  Download
  
  
• Step 3: Open leaderboard setting
  
  
  
• Step 4: At first setting your game id and leaderboard id than click create leaderboard.
  
  
  
• Step 5: Leaderboard will appear in the scene.
  
  
  
• Step 6: Finally use this function to submit score. Highest value will be stored.
  
  
  GameTaiko.Leaderboard.SendScore(this, [leaderboardId], [score]);
• Step 7: For Apple Store & Play Store Submission, please include privacy policy for approval
  Sample of Privacy Policy