diff --git a/credit-tracker-shortcodes.php b/credit-tracker-shortcodes.php
index e09d919..96fb377 100644
--- a/credit-tracker-shortcodes.php
+++ b/credit-tracker-shortcodes.php
@@ -26,6 +26,8 @@ function credit_tracker_table_shortcode($atts)
 
     if (is_numeric($size)) {
         $size = array($size, $size);
+    } else if (stripos($size, 'x') !== false) {
+        $size = explode('x', $size);
     }
 
     $request = array(
diff --git a/credit-tracker.php b/credit-tracker.php
index 162de88..cd4e290 100755
--- a/credit-tracker.php
+++ b/credit-tracker.php
@@ -12,7 +12,7 @@
  * License:     GPL-2.0+
  * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
  * Requires at least: 3.5.1
- * Tested up to: 3.8.1
+ * Tested up to: 3.8.3
  *
  * @package   Credit_Tracker
  * @author    Labs64 <info@labs64.com>
diff --git a/options.php b/options.php
index cf5cdf8..075b8a6 100644
--- a/options.php
+++ b/options.php
@@ -11,7 +11,7 @@
 
 
 define('CT_OPTIONS', 'CT_OPTIONS');
-define('API_KEY', 'bd58df75-36be-44e2-811b-063fd3957182');
+define('API_KEY', '31c7bc4e-90ff-44fb-9f07-b88eb06ed9dc');
 
 
 if (is_admin()) {
@@ -254,8 +254,8 @@ function print_reference_section()
                     default behavior, if no ID is specified, is to display all images containing author info.</p>
 
                 <p>&nbsp;&nbsp;<strong>size</strong> <i>(optional)</i> - specify the image size to use for the thumbnail
-                    display. Valid values include "thumbnail", "medium", "large", "full". The default value is
-                    "thumbnail".</p>
+                    display. Valid values include "thumbnail", "medium", "large", "full" or numeric values (e.g. "50" or "100x50").
+                    The default value is "thumbnail".</p>
 
                 <p>&nbsp;&nbsp;<strong>style</strong> <i>(optional)</i> - specify the table CSS style. Valid values
                     include "default", "mercury", "mars". The default value is "default".</p>
diff --git a/php/netlicensing/netlicensing.php b/php/netlicensing/netlicensing.php
index d78418e..112f2f7 100755
--- a/php/netlicensing/netlicensing.php
+++ b/php/netlicensing/netlicensing.php
@@ -13,18 +13,15 @@ class NetLicensing
 
     private $curl = null;
 
-    public $apiKey;
-
     /**
      * Initializes a NetLicensing object
      **/
     function __construct($apiKey)
     {
-        $this->apiKey = $apiKey;
-
         $user_agent = isset($_SERVER['HTTP_USER_AGENT']) ? $_SERVER['HTTP_USER_AGENT'] : 'NetLicensing/PHP ' . PHP_VERSION . ' (http://netlicensing.labs64.com)';
 
         $this->curl = new Curl();
+        $this->curl->headers['Authorization'] = 'Basic ' . base64_encode("apiKey:" . $apiKey);
         $this->curl->headers['Accept'] = 'application/json';
         $this->curl->user_agent = $user_agent;
     }
@@ -45,9 +42,6 @@ function validate($productNumber, $licenseeNumber, $licenseeName = '')
             $licenseeName = $licenseeNumber;
         }
         $url = self::NLIC_BASE_URL . '/licensee/' . $licenseeNumber . '/validate?productNumber=' . $productNumber . '&name=' . $licenseeName;
-        if (!empty($this->apiKey)) {
-            $url .= '&apiKey=' . $this->apiKey;
-        }
 
         $response = $this->curl->get($url, $vars = array());
 
diff --git a/readme.txt b/readme.txt
index 36e9b89..baa40a5 100644
--- a/readme.txt
+++ b/readme.txt
@@ -2,7 +2,7 @@
 Contributors: labs64
 Tags: credit, attribution, legal, copyright, owner, author, media library, media, image, photo, license, royalty-free, RF, Creative Commons, stock, attachment, fotolia, bildnachweis, impressum, imprint, microdata, NetLicensing
 Requires at least: 3.5.1
-Tested up to: 3.8.1
+Tested up to: 3.8.3
 Stable tag: 0.9.12
 License: GPL-2.0+
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
@@ -131,7 +131,8 @@ Yes you can! Join in on our [GitHub repository](https://github.com/Labs64/credit
 == Changelog ==
 
 = 0.9.12 =
-* ...
+* Add custom sizes at the credit table
+* Adapt NetLicensing authentication using apiKey
 
 = 0.9.11 =
 * German translation by Michail Preissnerov