Интеграция PayPal с Laravel не работает

Question

Я использую библиотеку ' "anouar / paypalpayment": "> = 3.0" ' для интеграции PayPal с приложением laravel 5.5, но когда я пересекаю любой маршрут платежа, он показывает ошибку

"Метод [showLoginForm] не существует в [App \ Http \ Controllers \ Auth \ LoginController]."

Ниже приведен код функции контроллера, который вызывает эту ошибку

    $shippingAddress= Paypalpayment::shippingAddress();
    $shippingAddress->setLine1("3909 Witmer Road")
        ->setLine2("Niagara Falls")
        ->setCity("Niagara Falls")
        ->setState("NY")
        ->setPostalCode("14305")
        ->setCountryCode("US")



    $payer = Paypalpayment::payer();
    $payer->setPaymentMethod("paypal");

    $item1 = Paypalpayment::item();
    $item1->setName('Ground Coffee 40 oz')
            ->setDescription('Ground Coffee 40 oz')
            ->setCurrency('USD')
            ->setQuantity(1)
            ->setTax(0.3)
            ->setPrice(7.50);




    $itemList = Paypalpayment::itemList();
    $itemList->setItems([$item1])
        ->setShippingAddress($shippingAddress);


    $details = Paypalpayment::details();
    $details->setShipping("1.2")
            ->setTax("1.3")
            //total of items prices
            ->setSubtotal("17.5");


    $amount = Paypalpayment::amount();
    $amount->setCurrency("USD")

            ->setTotal("20")
            ->setDetails($details);



    $transaction = Paypalpayment::transaction();
    $transaction->setAmount($amount)
        ->setItemList($itemList)
        ->setDescription("Payment description")
        ->setInvoiceNumber(uniqid());



    $redirectUrls = Paypalpayment::redirectUrls();
    $redirectUrls->setReturnUrl(url("/payments/success"))
        ->setCancelUrl(url("/payments/fails"));

    $payment = Paypalpayment::payment();

    $payment->setIntent("sale")
        ->setPayer($payer)
        ->setRedirectUrls($redirectUrls)
        ->setTransactions([$transaction]);


    return response()->json([$payment->toArray(), 'approval_url' => $payment->getApprovalLink()], 200);