应用发布通知给用户。 如何获得应用程序的访问令牌？

Question

I am using the new version 2, sdk 4.0 php. I am trying to send a notification to a user with my app. I just realised the access token that I get via login (user access token) is different to the access token for my app. I have searched online before posting it on here, but most is for the old sdk and cannot get the right syntax to work with mine.

My code:

$notification = (new FacebookRequest(
$session,
'POST',
'/'.$id[0].'/notifications',
array (
    'href' => "http://localhost/app/index.php",
    'template' => 'You have been tagged, please set privacy preference',
 )

))->execute()->getGraphObject()->asArray();

And my error:

Fatal error: Uncaught exception 'Facebook\\FacebookAuthorizationException' with message '(#15) This method must be called with an app access_token.' in C:\\xampp\\htdocs\\app\\Facebook\\FacebookRequestException.php:134 Stack trace: #0 C:\\xampp\\htdocs\\app\\Facebook\\FacebookRequest.php(268): Facebook\\FacebookRequestException::create('{"error":{"mess...', Object(stdClass), 400) #1 C:\\xampp\\htdocs\\app\\privacy.php(121): Facebook\\FacebookRequest->execute() #2 {main} thrown in C:\\xampp\\htdocs\\app\\Facebook\\FacebookRequestException.php on line 134

Can someone help me with getting the app access token?

Answer 1

You can get the app access_token as follows:

$appSession = FacebookSession::newAppSession();

Then you can do:

$notification = (new FacebookRequest(
$appSession,
'POST',
'/'.$id[0].'/notifications',
array (
    'href' => "http://localhost/app/index.php",
    'template' => 'You have been tagged, please set privacy preference',
 )

))->execute()->getGraphObject()->asArray();