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class OrderService
{
    public function __construct(
        private readonly PaymentGateway $payment,
        private readonly InventoryService $inventory,
        private readonly NotificationService $notifications,
    ) {}

    public function process(Order $order): OrderResult
    {
        return DB::transaction(function () use ($order) {
            // Validate inventory availability
            $this->inventory->reserve($order->items);

            // Process payment through gateway
            $charge = $this->payment->charge(
                amount: $order->total,
                method: $order->paymentMethod,
            );

            // Update order status and notify customer
            $order->markAsPaid($charge->id);
            $this->notifications->sendConfirmation($order);

            return new OrderResult(success: true, order: $order);
        });
    }
}