laravel 5 paypal 500错误

Question

我正在开发一个使用paypal rest api进行支付的laravel 5中的网站。但每当我尝试重定向到paypal页面进行付款我收到500错误。 在作曲家我使用“paypal / rest-api-sdk-php”：“*”

我按照本教程尝试适应laravel 5 here

Route::post('payment', array('as' => 'payment','uses' => 'PaypalController@postPayment',));

// this is after make the payment, PayPal redirect back to your site
Route::get('payment/status', array('as' => 'payment.status','uses' => 'PaypalController@getPaymentStatus',));

和控制器

use PayPal\Rest\ApiContext;
use PayPal\Auth\OAuthTokenCredential;
use PayPal\Api\Amount;
use PayPal\Api\Details;
use PayPal\Api\Item;
use PayPal\Api\ItemList;
use PayPal\Api\Payer;
use PayPal\Api\Payment;
use PayPal\Api\RedirectUrls;
use PayPal\Api\ExecutePayment;
use PayPal\Api\PaymentExecution;
use PayPal\Api\Transaction;

class PaypalController extends Controller
{

    private $_api_context;

    public function __construct()
    {

        // setup PayPal api context
        $paypal_conf = Config::get('paypal');
        $this->_api_context = new ApiContext(new OAuthTokenCredential($paypal_conf['client_id'], $paypal_conf['secret']));
        $this->_api_context->setConfig($paypal_conf['settings']);
    }


public function postPayment()
{


    $payer = new Payer();
    $payer->setPaymentMethod('paypal');

    $item_1 = new Item();
    $item_1->setName('Item 1') // item name
        ->setCurrency('USD')
        ->setQuantity(2)
        ->setPrice('15'); // unit price

    $item_2 = new Item();
    $item_2->setName('Item 2')
        ->setCurrency('USD')
        ->setQuantity(4)
        ->setPrice('7');

    $item_3 = new Item();
    $item_3->setName('Item 3')
        ->setCurrency('USD')
        ->setQuantity(1)
        ->setPrice('20');

    // add item to list
    $item_list = new ItemList();
    $item_list->setItems(array($item_1, $item_2, $item_3));

    $amount = new Amount();
    $amount->setCurrency('USD')
        ->setTotal(78);

    $transaction = new Transaction();
    $transaction->setAmount($amount)
        ->setItemList($item_list)
        ->setDescription('Your transaction description');

    $redirect_urls = new RedirectUrls();
    $redirect_urls->setReturnUrl(URL::route('payment.status'))
        ->setCancelUrl(URL::route('payment.status'));

    $payment = new Payment();
    $payment->setIntent('Sale')
        ->setPayer($payer)
        ->setRedirectUrls($redirect_urls)
        ->setTransactions(array($transaction));

    try {
        $payment->create($this->_api_context);
    } catch (\PayPal\Exception\PPConnectionException $ex) {
        if (\Config::get('app.debug')) {
            echo "Exception: " . $ex->getMessage() . PHP_EOL;
            $err_data = json_decode($ex->getData(), true);
            exit;
        } else {
            die('Some error occur, sorry for inconvenient');
        }
    }

    foreach($payment->getLinks() as $link) {
        if($link->getRel() == 'approval_url') {
            $redirect_url = $link->getHref();
            break;
        }
    }

    // add payment ID to session
    Session::put('paypal_payment_id', $payment->getId());

    if(isset($redirect_url)) {
        // redirect to paypal
        return Redirect::away($redirect_url);
    }

    return Redirect::route('original.route')
        ->with('error', 'Unknown error occurred');
}

public function getPaymentStatus()
{
    // Get the payment ID before session clear
    $payment_id = Session::get('paypal_payment_id');

    // clear the session payment ID
    Session::forget('paypal_payment_id');

    if (empty(Input::get('PayerID')) || empty(Input::get('token'))) {
        return Redirect::route('original.route')
            ->with('error', 'Payment failed');
    }

    $payment = Payment::get($payment_id, $this->_api_context);

    // PaymentExecution object includes information necessary 
    // to execute a PayPal account payment. 
    // The payer_id is added to the request query parameters
    // when the user is redirected from paypal back to your site
    $execution = new PaymentExecution();
    $execution->setPayerId(Input::get('PayerID'));

    //Execute the payment
    $result = $payment->execute($execution, $this->_api_context);

    echo '<pre>';print_r($result);echo '</pre>';exit; // DEBUG RESULT, remove it later

    if ($result->getState() == 'approved') { // payment made
        return Redirect::route('original.route')
            ->with('success', 'Payment success');
    }
    return Redirect::route('original.route')
        ->with('error', 'Payment failed');
}


}

这就是调用路线的地方

{!! Form::open(['route' => 'payment', 
                    'class' => 'form-horizontal', 
                    'role' => 'form', 
                    'onsubmit' => 'return confirm("by clicking \'OK\' you accept the Terms and Conditions");']) !!}