title: Facebook Page Access Token with read_page_mailboxes permission
body: <p>I need to send private replies to page comments from my website. I am admin of the page and app.</p>
  
  <p>Facebook's graph's api doc states following: "A Page access token with the read_page_mailboxes permission is required to create a message" but does not say, how to get the token with such permission.</p>
  
  <p>I have tried tokens from "<strong>me/accounts</strong>", "<strong>/{page_id}?fields=access_token</strong>" and even generated 60 day access token from graph api explorer, but I get "OAuthException" with message "Requires read_page_mailboxes permission to manage the object". Any ideas?</p>