title: Unity Facebook apprequest works but no notification shown
body: <p>How do I make my mobile game send a request that is shown as notification like in Candy Crush Saga game.</p>
  
  <p>I went through this <a href="https://stackoverflow.com/questions/16792782/app-requests-successful-but-no-notification-shown">App requests successful, but no notification shown</a> but can't find the solution. I don't know what to put in my canvas URL.</p>
  
  <p>GAME is developed in Unity3d.</p>