public function getUberAccessToken() {
        $client_id = $this->config->item('uber_client_id');
        $client_secret = $this->config->item('uber_client_secret');
        
        $url = "https://login.uber.com/oauth/v2/token";
        $post_fields = http_build_query([
            'client_id' => $client_id,
            'client_secret' => $client_secret,
            'grant_type' => 'client_credentials',
            'scope' => 'delivery'
        ]);

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_fields);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        
        $response = curl_exec($ch);
        $result = json_decode($response, true);
        curl_close($ch);
        
        return isset($result['access_token']) ? $result['access_token'] : null;
    }

    public function UberDirectCreateDelivery($order_id, $order, $order_products, $resturant) {
        $token = $this->getUberAccessToken();
        if (!$token) {
            return ['status' => 'failed', 'message' => 'Uber Access Token Failed'];
        }

        $customer_id = $this->config->item('uber_customer_id'); // Business/Customer ID
        $url = "https://api.uber.com/v1/customers/" . $customer_id . "/deliveries";

        // Map items for Uber structure
        $manifest_items = [];
        foreach ($order_products as $op) {
            $manifest_items[] = [
                "name" => $op['item_name'],
                "quantity" => intval($op['item_qty']),
                "price" => floatval($op['item_cost']) * 100 // Prices in cents
            ];
        }

        $request_body = json_encode([
            "external_id" => $order_id,
            "manifest_items" => $manifest_items,
            "pickup_name" => $resturant->branch_name,
            "pickup_address" => $resturant->address,
            "pickup_phone_number" => $resturant->phone,
            "dropoff_name" => $order->customer_name,
            "dropoff_address" => $order->complete_address,
            "dropoff_phone_number" => $order->phone,
            "dropoff_instructions" => $order->delivery_note,
            "tip_by_customer" => intval($order->real_doordash_driver_tip * 100), // reusing tip variable, to be updated later
            "test_mode" => true // SANDBOX MODE
        ]);

        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_POST, 1);
        curl_setopt($ch, CURLOPT_POSTFIELDS, $request_body);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_HTTPHEADER, [
            "Content-Type: application/json",
            "Authorization: Bearer " . $token
        ]);

        $response = curl_exec($ch);
        $status_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
        curl_close($ch);

        return ['response' => $response, 'status_code' => $status_code];
    }