Facebook PHP SDK v4 manage_pages permission for non developer account - php

Question

We are trying to create an app to pull in facebook reviews which requires the manage_page permission. This is not an app which we would like to submit for review as we are only using this for our clients.
We are currently able to get the access token for all pages when logging in as the administration developers.facebook.com account using the following code below which gives us the data array with all access_tokens as expected.
However the problem we have is when we try to login with the clients facebook account the array is empty.
So we tried to add them as an admin for the app which is not ideal as they are not developers so would not be happy with this approach.
I believe this is not working due to manage_page permission.
Does anyone know a way around this without having to submit the app for review?
$app_id = '1234567890';
$app_secret = 'ABCDEFGHIJKM';
$facebook = FacebookSession::setDefaultApplication($app_id, $app_secret);
$session = FacebookSession::newAppSession();
$callback_url = 'http://'. $_SERVER['SERVER_NAME'].$_SERVER['REQUEST_URI'];
$helper = new FacebookRedirectLoginHelper($callback_url, $app_id, $app_secret);
try {
$session = $helper->getSessionFromRedirect();
} catch(FacebookSDKException $e) {
echo 'FacebookSDKException Error: ' . $e->getMessage();
$session = null;
} catch(\Exception $ex) {
echo 'Exception Error: ' . $e->getMessage();
}
print "<pre>"; print_r($session); print "</pre>";
if ($session) {
// User logged in, get the AccessToken entity.
$accessToken = $session->getAccessToken();
// Exchange the short-lived token for a long-lived token.
$longLivedAccessToken = $accessToken->extend();
// Make calls to Graph with the long-lived token.
} else {
echo 'Login with Facebook';
}
FacebookSession::enableAppSecretProof(false);
try {
$request = new FacebookRequest($session, 'GET', '/me/accounts?fields=name,access_token,perms');
$pageList = $request->execute()
->getGraphObject()
->asArray();
} catch(FacebookRequestException $e) {
echo 'FacebookRequestException Error: ' . $e->getMessage();
} catch(\Exception $ex) {
echo 'Exception Error: ' . $e->getMessage();
}
print "<pre>"; print_r($pageList); print "</pre>";