public function __construct($id, $parent = null, $config = array())
{
parent::__construct($id, $parent, $config);
$this->ipnUrl = Yii::$app->urlManager->createAbsoluteUrl($this->ipnUrl);
$this->expressSuccessUrl = Yii::$app->urlManager->createAbsoluteUrl($this->expressSuccessUrl);
$this->subscriptionExpressSuccessUrl = Yii::$app->urlManager->createAbsoluteUrl($this->subscriptionExpressSuccessUrl);
$this->cancelUrl = Yii::$app->urlManager->createAbsoluteUrl($this->cancelUrl);
}