diff --git a/app/Tygh/Pdf.php b/app/Tygh/Pdf.php
index 7bd9c9b..271fea6 100644
--- a/app/Tygh/Pdf.php
+++ b/app/Tygh/Pdf.php
@@ -18,8 +18,8 @@ use Tygh\Http;
 
 class Pdf
 {
-    protected static $transaction_id;
-    protected static $url = 'http://converter.cart-services.com';
+    private static $_transaction_id;
+    private static $_url = 'http://converter.cart-services.com';
 
     /**
      * Pushes HTML code to batch to render PDF later
@@ -28,10 +28,10 @@ class Pdf
      */
     public static function batchAdd($html)
     {
-        $transaction_id = Http::post(self::action('/pdf/batch/add'),
+        $transaction_id = Http::post(self::_action('/pdf/batch/add'),
             json_encode(array(
-                'transaction_id' => !empty(self::$transaction_id) ? self::$transaction_id : '',
-                'content' => self::convertImages($html)
+                'transaction_id' => !empty(self::$_transaction_id) ? self::$_transaction_id : '',
+                'content' => self::_convertImages($html)
             )), array(
                 'headers' => array(
                     'Content-type: application/json',
@@ -40,8 +40,8 @@ class Pdf
                 'binary_transfer' => true
             ));
 
-        if (!empty($transaction_id) && empty(self::$transaction_id)) {
-            self::$transaction_id = json_decode($transaction_id);
+        if (!empty($transaction_id) && empty(self::$_transaction_id)) {
+            self::$_transaction_id = json_decode($transaction_id);
         }
 
         return !empty($transaction_id);
@@ -58,27 +58,24 @@ class Pdf
     public static function batchRender($filename = '', $save = false, $params = array())
     {
         $default_params = array(
-            'transaction_id' => self::$transaction_id,
+            'transaction_id' => self::$_transaction_id,
             'page_size' => 'A4'
         );
 
         $params = array_merge($default_params, $params);
 
-        $file = fn_create_temp_file();
-
-        $response = Http::post(self::action('/pdf/batch/render'), json_encode($params), array(
+        $content = Http::post(self::_action('/pdf/batch/render'), json_encode($params), array(
             'headers' => array(
                 'Content-type: application/json',
                 'Accept: application/pdf'
             ),
-            'binary_transfer' => true,
-            'write_to_file' => $file
+            'binary_transfer' => true
         ));
 
-        self::$transaction_id = null;
+        self::$_transaction_id = null;
 
-        if (!empty($response)) {
-            return self::output($file, $filename, $save);
+        if (!empty($content)) {
+            return self::_output($content, $filename, $save);
         }
 
         return false;
@@ -98,8 +95,8 @@ class Pdf
             $html = implode("<div style='page-break-before: always;'>&nbsp;</div>", $html);
         }
 
-        if (self::isLocalIP(gethostbyname($_SERVER['HTTP_HOST']))) {
-            $html = self::convertImages($html);
+        if (self::_isLocalIP(gethostbyname($_SERVER['HTTP_HOST']))) {
+            $html = self::_convertImages($html);
         }
 
         $default_params = array(
@@ -107,21 +104,18 @@ class Pdf
             'page_size' => 'A4'
         );
 
-        $params = array_merge($default_params, $params);
-
-        $file = fn_create_temp_file();
+        $params = array_merge($default_params, $params);        
 
-        $response = Http::post(self::action('/pdf/render'), json_encode($params), array(
+        $content = Http::post(self::_action('/pdf/render'), json_encode($params), array(
             'headers' => array(
                 'Content-type: application/json',
                 'Accept: application/pdf'
             ),
-            'binary_transfer' => true,
-            'write_to_file' => $file
+            'binary_transfer' => true
         ));
 
-        if (!empty($response)) {
-            return self::output($file, $filename, $save);
+        if (!empty($content)) {
+            return self::_output($content, $filename, $save);
         }
 
         return false;
@@ -132,26 +126,26 @@ class Pdf
      * @param  string $action action
      * @return string formed URL
      */
-    protected static function action($action)
+    private static function _action($action)
     {
-        return self::$url . $action;
+        return self::$_url . $action;
     }
 
     /**
      * Saves PDF document or outputs it
-     * @param  string  $file  file with PDF document
+     * @param  string  $content  PDF document
      * @param  string  $filename filename to save PDF or name of attachment to download
      * @param  boolean $save     saves to file if true, outputs if not
      * @return mixed   true if document saved, false on failure or outputs document
      */
-    protected static function output($file, $filename = '', $save = false)
+    private static function _output($content, $filename = '', $save = false)
     {
         if (!empty($filename) && strpos($filename, '.pdf') === false) {
             $filename .= '.pdf';
         }
 
         if (!empty($filename) && $save == true) {
-            return fn_rename($file, $filename);
+            return fn_put_contents($filename, $content);
 
         } else {
             if (!empty($filename)) {
@@ -160,8 +154,7 @@ class Pdf
             }
 
             header('Content-type: application/pdf');
-            readfile($file);
-            fn_rm($file);
+            fn_echo($content);
             exit;
         }
 
@@ -173,7 +166,7 @@ class Pdf
      * @param  string $html html code
      * @return string html code with converted links
      */
-    protected static function convertImages($html)
+    private static function _convertImages($html)
     {
         $http_location = Registry::get('config.http_location');
         $https_location = Registry::get('config.https_location');
@@ -232,7 +225,7 @@ class Pdf
      * @param  string  $ip IP address
      * @return boolean true if IP is local, false - if public
      */
-    protected static function isLocalIP($ip)
+    private static function _isLocalIP($ip)
     {
         $ranges = array(
             '10' => array(