允许Facebook Canvas应用进行发布测试

我已经创建了一个简单的画布应用程序。我已经在facebook中设置了我的访问令牌，但这个访问令牌设置了范围public_profile, basic_info, user_friends

我还想添加public_action，以便我也可以测试张贴。

我使用php FacebookSdk 4.0与以下代码

// init app with app id (APPID) and secret (SECRET)
FacebookSession::setDefaultApplication('{app_id}','{app_secret}');
$helper = new FacebookCanvasLoginHelper();
try {
          $session = $helper->getSession();
} catch ('Exception $ex) {
  echo $ex->getMessage();
}
if($session) 
{
    $request = new FacebookRequest( $session, 'GET', '/me' );
    try{
         $response = $request->execute();
         $graphObject = $response->getGraphObject();
         //echo  print_r( $graphObject, 1 );
    } catch(FacebookRequestException $ex) {
         echo $ex->getMessage();
    } catch ('Exception $ex) {
        echo $ex->getMessage();
    }
    try{
     $response = (new FacebookRequest(
      $session, 'POST', '/me/feed', array(
        'link' => 'www.example.com',
        'message' => 'User provided message'
      )
    ))->execute()->getGraphObject();
    } catch(FacebookPermissionException $ex) {
         echo $ex->getMessage();
    } catch ('Exception $ex) {
        echo $ex->getMessage();
    }
}
else 
{
 // show login url  
}

(#200) The user hasn't authorized the application to perform this action

如何给自己发布权限?

我已经设法使用以下代码获得发布权限

          $url = 'https://www.facebook.com/dialog/oauth?client_id=xxx
&redirect_uri=https://xxxx/v1/&scope=publish_actions';

以下是我的代码从Fb开发人员文档

  try {
    $response = (new FacebookRequest(
      $session, 'POST', '/me/feed', array(
        'link' => 'www.example.com',
        'message' => 'User provided message'
      )
    ))->execute()->getGraphObject();
    echo "Posted with id: " . $response->getProperty('id');
  } catch(FacebookRequestException $e) {
    echo "Exception occured, code: " . $e->getCode();
    echo " with message: " . $e->getMessage();
  }  

我得到错误

Exception occured, code: 100 with message: Invalid parameter