function __construct($key, $secret, $extensionSettingPath = null, $extensionTemplatePath = null)
 {
     $this->api = new NimbusecAPI($key, $secret);
     if (!empty($extensionSettingPath)) {
         self::$extensionSettingPath = $extensionSettingPath;
     }
     if (!empty($extensionTemplatePath)) {
         self::$extensionTemplatePath = $extensionTemplatePath;
     }
 }