Adi Novendra Putra, S.Kom.

public function calculateProgressiveTariff(int $usageCubic): float {
    $tier1 = min($usageCubic, 10) * 1500;
    $tier2 = max(0, min($usageCubic - 10, 10)) * 2200;
    $tier3 = max(0, $usageCubic - 20) * 3500;
    return $tier1 + $tier2 + $tier3 + $this->maintenanceFee;
}

@Service
public class OrderEventProducer {
    private final KafkaTemplate<String, OrderEvent> kafkaTemplate;

    public void publishOrderCompleted(OrderEvent event) {
        kafkaTemplate.send("store.order.completed", event.getOrderId(), event)
            .whenComplete((result, ex) -> {
                if (ex == null) log.info("Event published: {}", event.getOrderId());
            });
    }
}

public function handleXenditWebhook(Request $request): JsonResponse {
    $callbackToken = $request->header('x-callback-token');
    if ($callbackToken !== config('services.xendit.webhook_token')) {
        return response()->json(['error' => 'Unauthorized'], 401);
    }
    $this->orderService->markAsPaid($request->input('external_id'));
    return response()->json(['status' => 'success']);
}

// Confidential Client Code - Architecture Logic Sanitized
public function provisionVpsInstance(Subscription $sub): string {
    $vps = $this->vpsManager->allocateDedicatedServer($sub->plan_type);
    $this->eaInstaller->deployTradingBot($vps->ip, $sub->ea_license_key);
    return $vps->id;
}

// Automated monthly cron invoicing routine
public function runMonthlyBillingGeneration(): void {
    $activeSubscribers = $this->subscriberModel->getActiveAccounts();
    foreach ($activeSubscribers as $sub) {
        $this->invoiceModel->createMonthlyBill($sub->id, $sub->package_price);
    }
}

// Multi-dimensional scoring formula for university governance
public function computeMaturityScore(array $scores, array $weights): float {
    return array_sum(array_map(fn($s, $w) => $s * $w, $scores, $weights));
}

export const fetchFromRapidAPI = async (url) => {
    const { data } = await axios.get(`${BASE_URL}/${url}`, {
        headers: { 'X-RapidAPI-Key': import.meta.env.VITE_RAPID_API_KEY }
    });
    return data;
};

<div className="grid grid-cols-1 md:grid-cols-3 gap-6">
  {pricingPlans.map((plan, index) => (
    <PricingCard key={index} plan={plan} />
  ))}
</div>