Custom scopes with Facebook Login WordPress plugin https://timersys.com/plugins/facebook-login-pro/

functions.php

<?php
/**
* Collect custom scopes with Facebook Login WordPress plugin
* https://timersys.com/plugins/facebook-login-pro/
**/

// Change default scopes
add_filter('fbl/app_scopes', function( $scopes ) {
  return 'email,public_profile,user_posts'; // pass custom scopes
});

// change fields to retrieve
add_filter( 'fbl/js_auth_data', function( $vars ) {
  $vars['fields'] =  'id,first_name,last_name,email,link'; // pass fields needed
  return $vars;
});

// do something with data
add_action( 'fbl/after_login', function( $user, $user_id, $facebook_data ) {
  var_dump($facebook_data); // check returned data and do something with it
  ...
},10,3);