public function listAvailableProductTypes() { $result = null; $response = $this->getClient()->call('listAvailableProductTypes', array()); if ($response->hasError() === false) { $resultObject = $response->getResult(); if (!empty($resultObject) && property_exists($resultObject, 'count') && $resultObject->count > 0) { $result = $this->_loadProductTypesList($resultObject->producttypes); } } return $result; }