/**
* Public function that creates a single instance
*/
public static function getInstance($parent)
{
if (!isset(self::$_instance)) {
self::$_instance = new self($parent);
}
return self::$_instance;
}
/**
* Constructor
*/
protected function __construct()
{
global $section;
parent::__construct(__FILE__);
// register backend
if (class_exists('backend') && class_exists('shop')) {
$backend = backend::getInstance();
$method_menu = $backend->getMenu('shop_payment_methods');
if (!is_null($method_menu)) {
$method_menu->addChild('', new backend_MenuItem($this->getLanguageConstant('menu_google_checkout'), url_GetFromFilePath($this->path . 'images/icon.png'), window_Open('paypal', 650, $this->getLanguageConstant('title_settings'), true, true, backend_UrlMake($this->name, 'settings')), $level = 5));
}
}
// register payment method
if (class_exists('shop')) {
require_once "units/google_checkout_payment_method.php";
GoogleCheckout_PaymentMethod::getInstance($this);
}
}
