Facebook API Real Time updates for Page/Feed no response - php

Question

I have a problem with Facebook Real-time subscription from my facebook page.
When I POST a subscription, i get the message from facebook about it to my call back url.
Code:
$session = new FacebookSession('<APP ACCESS TOKEN>');
$request = new FacebookRequest(
$session,
'POST',
'/<APP ID>/subscriptions',
array(
'object' => 'page',
'callback_url' => 'http://*************/facebook/callback.php',
'fields' => 'conversation', // a try 'feed' to
'verify_token' => '<VERIFY TOKEN>',
)
);
$response = $request->execute();
BUT when someone add a post/conversation to my fb page, facebook don't send me any data.
callback.php code:
<?php
// Insert the path where you unpacked log4php
include('log4php/Logger.php');
// Tell log4php to use our configuration file.
Logger::configure('config.xml');
// Fetch a logger, it will inherit settings from the root logger
$log = Logger::getLogger('myLogger');
// Start logging
$log->warn($_REQUEST); // Logged because WARN >= WARN
require_once __DIR__ . '/facebook-php-sdk-v4-5.0-dev/src/Facebook/autoload.php';
use Facebook\FacebookSession;
use Facebook\FacebookRequest;
use Facebook\Authentication\AccessToken;
use Facebook\GraphUser;
use Facebook\FacebookRequestException;
//define('VERIFY_TOKEN', '*******');
$method = $_SERVER['REQUEST_METHOD'];
if ($method == 'GET' && $_GET['hub_mode'] == 'subscribe' && $_GET['hub_verify_token'] == '<VERIFY TOKEN>') {
echo $_GET['hub_challenge'];
$log->warn($_GET);
$log->warn($_POST);
} else if ($method == 'POST') {
$updates = json_decode(file_get_contents("php://input"), true);
// Here you can do whatever you want with the JSON object that you receive from FaceBook.
// Before you decide what to do with the notification object you might aswell just check if
// you are actually getting one. You can do this by choosing to output the object to a textfile.
// It can be done by simply adding the following line:
// file_put_contents('/filepath/updates.txt',$updates, FILE_APPEND);
$log->warn($updates);
$log->warn($_GET);
$log->warn($_POST);
error_log('updates = ' . print_r($obj, true));
}
Thank you for your help !

Answer 1

There is currently an open bug with Facebook support:
https://developers.facebook.com/bugs/709097499224897/
So it's possible that this is a temporary issue...

Answer 2

What's the output of /{your-app-id}/subscriptions?
According to your code you subscribed to /conversations which requires read_page_mailboxes permissions. You probably want to try a simple page feed subscription first to see if this works.
RTU updates seem to be back to normal since yesterday, but deleting your subscriptions and re-subscribing might be worth a try, too, since you probably subscribed to a black hole when RTU had issues yesterday.

Answer 3

I find answer with a big help from facebook developers forum friends :)
My code to make subscription and callback code is good. But to get conversations or feed it is not enough. I have to add my app to my page as a subscribed_app using request in graph api:
POST
{page-id}/subscribed_apps
the docs for this operation is on:
https://developers.facebook.com/docs/graph-api/reference/page/subscribed_apps/