WitShop/app/Http/Controllers/Shop/PayPalController.php

<?php

namespace App\Http\Controllers\Shop;

use App\Http\Controllers\Controller;
use App\Services\CartService;
use App\Services\OrderService;
use App\Models\Coupon;
use App\Models\Order;
use App\Models\ShippingRate;
use Illuminate\Http\Request;
use Srmklive\PayPal\Services\PayPal as PayPalClient;

class PayPalController extends Controller
{
    public function __construct(private CartService $cart, private OrderService $orderService) {}

    public function redirect(Request $request)
    {
        $checkoutData = session('checkout_data');
        if (!$checkoutData || $this->cart->count() === 0) {
            return redirect()->route('checkout.index');
        }

        $subtotal     = $this->cart->subtotal();
        $country      = $checkoutData['shipping']['country'] ?? $checkoutData['billing']['country'] ?? 'DE';
        $shippingRate = ShippingRate::forCart($subtotal, $country);
        $shippingCost = $shippingRate ? $shippingRate->getCostForTotal($subtotal) : 0;
        $discount     = 0;
        if ($code = session('coupon_code')) {
            $coupon = Coupon::findValid($code);
            if ($coupon) $discount = $coupon->calcDiscount($subtotal);
        }
        $total = max(0, $subtotal - $discount) + $shippingCost;

        $provider = new PayPalClient;
        $provider->setApiCredentials(config('paypal'));
        $provider->getAccessToken();

        $order = $provider->createOrder([
            'intent' => 'CAPTURE',
            'purchase_units' => [[
                'amount' => [
                    'currency_code' => 'EUR',
                    'value'         => number_format($total, 2, '.', ''),
                ],
                'description' => config('app.name') . ' Bestellung',
            ]],
            'application_context' => [
                'return_url' => route('paypal.success'),
                'cancel_url' => route('checkout.confirm'),
            ],
        ]);

        if (isset($order['id'])) {
            session(['paypal_order_id' => $order['id']]);
            foreach ($order['links'] as $link) {
                if ($link['rel'] === 'approve') {
                    return redirect($link['href']);
                }
            }
        }

        return redirect()->route('checkout.confirm')->with('error', 'PayPal-Verbindung fehlgeschlagen. Bitte versuchen Sie es erneut.');
    }

    public function success(Request $request)
    {
        $checkoutData = session('checkout_data');
        $paypalOrderId = session('paypal_order_id');

        if (!$checkoutData || !$paypalOrderId) {
            return redirect()->route('checkout.index');
        }

        $provider = new PayPalClient;
        $provider->setApiCredentials(config('paypal'));
        $provider->getAccessToken();

        $result = $provider->capturePaymentOrder($paypalOrderId);

        if (($result['status'] ?? '') !== 'COMPLETED') {
            return redirect()->route('checkout.confirm')->with('error', 'PayPal-Zahlung nicht abgeschlossen.');
        }

        $checkoutData['payment_method'] = 'paypal';
        $order = $this->orderService->createFromSession($checkoutData, 'paypal');
        $order->update([
            'payment_id' => $paypalOrderId,
            'status'     => 'payment_received',
            'paid_at'    => now(),
        ]);

        session()->forget(['checkout_data', 'checkout_country', 'paypal_order_id']);

        return redirect()->route('checkout.thankyou', $order->order_number);
    }

    public function cancel()
    {
        session()->forget('paypal_order_id');
        return redirect()->route('checkout.confirm')->with('error', 'PayPal-Zahlung abgebrochen.');
    }
}