My PHP Code

<?php
require '../src/facebook.php';
$facebook = new Facebook(array(
  'appId'  => '339554932739xxx',
  'secret' => 'acb1234def85858',
));

$pages = $facebook->api('/me/accounts');

foreach ($pages['data'] as $page) {
    $page_access_token = $page['access_token'];
    $page_conversations = $facebook->api('/234234234234/conversations', 'GET', array('access_token' => $page_access_token));
    echo "<pre>";
    var_dump($page_conversations);
    echo "</pre>";
}