Using protected keyword instead of private

Billogram/Api.php

@@ -61,19 +61,19 @@ class Api
     const API_URL_BASE = "https://billogram.com/api/v2";
     const USER_AGENT = "Billogram API PHP Library/1.11";
 
-    private $authUser;
-    private $authKey;
-    private $apiBase;
-    private $userAgent;
-    private $extraHeaders;
-
-    private $itemsConnector;
-    private $customersConnector;
-    private $billogramConnector;
-    private $settingsConnector;
-    private $logotypeConnector;
-    private $reportsConnector;
-    private $creditorsConnector;
+    protected $authUser;
+    protected $authKey;
+    protected $apiBase;
+    protected $userAgent;
+    protected $extraHeaders;
+
+    protected $itemsConnector;
+    protected $customersConnector;
+    protected $billogramConnector;
+    protected $settingsConnector;
+    protected $logotypeConnector;
+    protected $reportsConnector;
+    protected $creditorsConnector;
 
     /**
      * Create a Billogram API connection object
@@ -107,7 +107,7 @@ public function __construct(
      * de-encoded data.
      *
      */
-    private function checkApiResponse($response, $expectContentType = null)
+    protected function checkApiResponse($response, $expectContentType = null)
     {
         if (!$response->ok || $expectContentType == null)
             $expectContentType = 'application/json';
@@ -206,7 +206,7 @@ private function checkApiResponse($response, $expectContentType = null)
      * object with statusCode, status, content and the received headers.
      *
      */
-    private function httpRequest(
+    protected function httpRequest(
         $url,
         $request,
         $data = array(),
@@ -280,7 +280,7 @@ private function httpRequest(
      * Returns an Authorization header to be used for the httpRequest method.
      *
      */
-    private function authHeader()
+    protected function authHeader()
     {
         $auth = base64_encode($this->authUser . ":" . $this->authKey);
 

Billogram/Api/Query.php

@@ -44,12 +44,12 @@
  */
 class Query
 {
-    private $typeClass;
-    private $filter = array();
-    private $countCached = null;
-    private $pageSize = 100;
-    private $order = array();
-    private $api;
+    protected $typeClass;
+    protected $filter = array();
+    protected $countCached = null;
+    protected $pageSize = 100;
+    protected $order = array();
+    protected $api;
 
     /**
      * Initiated with the Billogram API object and the parent model as
@@ -71,7 +71,7 @@ public function __construct($api, $typeClass)
      * @param int $pageNumber
      * @return mixed
      */
-    private function makeQuery($pageNumber = 1)
+    protected function makeQuery($pageNumber = 1)
     {
         $params = array(
             'page_size' => $this->pageSize,