How to Publish on Facebook Page automatic from php server scripts? - php

Question

My client has a e-commerce website where they sell their products and they also have facebook page for that website. I want to to publish wall post on that page when ever the product price is reduced or new product is lunched. But i want to make this automatic, so i want to authorize facebook automatic, means that i don't want any login dialog box. the script should authorize itself. now the code i am using is as below but it ask me for log in. and also tell me which method is good(easy) to publish page wall post?
require 'API_Library/Facebook/src/facebook.php';
$page_id = '111111111111111';
$appId = '111111111111111';
$appSecret = 'aaaaaaaaaaaaaaaaaaaaa22222222222';
$facebook = new Facebook(array(
'appId' => $appId,
'secret' => $appSecret,
'cookie' => true
));
$session = $facebook->getAccessToken();
$me = NULL;
if($session)
{
try
{
$me = $facebook->api('/me');
$facebook->api('me/feed', 'post', array(
'message' => 'Hello World!'
));
}
catch(FacebookApiException $e)
{
echo $e->getMessage();
}
}
OUTPUT:
(#200) The user hasn't authorized the application to perform this action

Answer 1

In order to post something to a page, you will need the administrator of the page to be authenticated with the application. You cannot post to a page without being authenticated. So there will be some user interaction required before you can set this up automatically.
The process would be as follows:
Setup a Facebook App to get a App ID and app secret - you'll need this to query the API and post updates to the page
As the page administrator, login to your app with the manage_pages permission.
After logging in, an API call to /me/accounts will give you an access_token to access the page and publish updates
Using the page's accesss_token, you can then POST updates using /{page_id}/feed
Hope this helps.