title: error OAuthException "message": "mailbox requires the read_mailbox extended permission."
body: <p>I am getting this error while trying to access Facebook Graph api mailbox </p>
  
  <pre><code>https://graph.facebook.com/me/inbox?access_token=&lt;access_token&gt; 
  
  
  "error": {
        "type": "OAuthException",
        "message": "mailbox requires the read_mailbox extended permission."
  </code></pre>
  
  <p>The access token is valid.. But any hints on the permissions and where I am going wrong..
  First, on logging in to Fb, it gives me a code and then access_token</p>
  
  <p>Thanks for your help.</p>