What is the correct way to get a response from the API?

Question

Yii

Dear specialists, I'm trying to add payment on the site from LiqPay, the payment itself goes through, but in response I can't get the payment status - passed or not... I
use borysenko/yii2-liqpay
Controller code:

public function actionView($id)
    {
        if (!$order = $this->orders->findOwn(\Yii::$app->user->id, $id)) {
            throw new NotFoundHttpException('The requested page does not exist.');
        }

        $liqpay = new LiqPay($this->public_key, $this->private_key);
        $html = $liqpay->cnb_form(array(
            'action'         => 'pay',
            'amount'         => $order->cost,
            'currency'       => 'UAH',
            'sandbox'        => true,
            'description'    => 'Оплата заказа ' . $order->id,
            'order_id'       => $order->id,
            'version'        => '3',
            'server_url'     => Url::home('https') .  'cabinet/order/result',
            'result_url'     => Url::home('https') .  'cabinet/order/result'
        ));

        return $this->render('view', [
            'order' => $order,
            'html' => $html,
        ]);
    }

    public function actionResult()
    {
        $arr = json_decode(base64_decode(Yii::$app->request->post('data')), true, 2,JSON_OBJECT_AS_ARRAY);
var_dump($arr);die();
        $order = Order::findOne(['id' => $arr['order_id']]);

        if ($arr['status'] == 'sandbox') {
            $this->service->pay($arr['order_id']);
            $office = $this->mailer->compose(
                [
                    'html' => 'shop/checkout-html',
                    'text' => 'shop/checkout-text'
                ],
                ['order' => $order]
            )
                ->setTo('[email protected]')
                ->setSubject('Новый заказ ' . \Yii::$app->name)
                ->send();

            if (!$office) {
                throw new \RuntimeException('Ошибка при отправке email.');
            }

            $sent = $this->mailer->compose(
                [
                    'html' => 'shop/checkout-html',
                    'text' => 'shop/checkout-text'
                ],
                ['order' => $order]
                )
                ->setTo('[email protected]')
                ->setSubject('Новый заказ ' . \Yii::$app->name)
                ->send();

            if (!$sent) {
                throw new \RuntimeException('Ошибка при отправке email.');
            }
        }

        return $this->redirect(['view', 'id' => $arr['order_id'],
            'order' => $order,
            'arr' => $arr,
        ]);
    }

    /**
     * @inheritdoc
     */
    public function beforeAction($action)
    {
        if ($action->id == 'result') {
            $this->enableCsrfValidation = false;
        }

        return parent::beforeAction($action);
    }

I suspect that somehow I accept the request in a wrong way (inside yii I pass all sorts of id, slug parameters to the URL ...), but how to do it "so" - niasilil ...
Please explain in more detail