Getting all products from current order in succes page magento 2

I am working on module for some affiliate program.

Everything is fine , until i try to bring the ordered items in the succes page , just for testing my json that i need to sent further to another API via some JS.

The problem: I order 3 or more items , and in the result of the json , it comes just the last item from the order .

here is the code of the method where i bring all data from the order:
(I ordered 1 item from every product)

public function getOrderData()
{
    $order = $this->checkoutSession->getLastRealOrder();
    $orderId = $order->getIncrementId();
    if ($orderId) {
        //get list of categories and brands
        $brands = [];
        $categories = [];
        $categoriesToMerge = [];
        /** @var Item $item */
        foreach ($order->getAllVisibleItems() as $item) {
            $product = $item->getProduct();
            $brandAttribute = $this->getBrandAttribute();
            if ($brandAttribute && $product->getData($brandAttribute)) {
                $brands[] = $product->getCustomAttribute($brandAttribute)->getValue();
            }
            $categoriesToMerge[] = $product->getCategoryIds();
        }
        $categories = array_merge([], ...$categoriesToMerge);
        $brandsArr = [];
        if ($brands) {
            $brands = $this->brandCollectionFactory->create()
                ->addFieldToSelect('entity_id')
                ->addFieldToSelect('name')
                ->addFieldToFilter('entity_id', $brands);
            foreach ($brands as $brand) {
                $brandsArr[$brand->getEntityId()] = $brand->getName();
            }
        }
        $categories = array_unique($categories);
        $catArr = [];
        if ($categories) {
            $categories = $this->categoryCollectionFactory->create()
                ->addFieldToSelect('name')
                ->addFieldToFilter('entity_id', $categories);
            foreach ($categories as $category) {
                $catArr[$category->getId()] = $category->getName();
            }
        }
        $itemsDesc = [];
        $items = [];

        foreach ($order->getAllVisibleItems() as $item) {
            $itemsDesc[] = $item->getName() . 'x' . $item->getQtyOrdered();
            $product = $item->getProduct();
            
            $catIds = $product->getCategoryIds();
            $productCatArr = [];
            foreach ($catIds as $id) {
                $productCatArr[] = $catArr[$id];
            }
            $items['quantity'] = (int)$item->getQtyOrdered();
            $items['product_id'] = $product->getId();
            $items['value'] = $item->getPrice();
            $items['name'] = $product->getName();
            $items['category'] = $productCatArr;
            if ($this->getIsBrandAttributeEnabled()) {
                $items['brand'] = $this->config->getTrackingBrand($product);
            }
        }


        // get order total without shipping and VAT
        $orderTotal = ($order->getGrandTotal() - $order->getShippingAmount())/1.19;
        return [
            'value' => number_format($orderTotal, 2, '.', ''),
            'transaction_id' => $order->getIncrementId(),
            'placed_at' => $order->getCreatedAt(),
            'currency_code' => $order->getBaseCurrencyCode(),
            'description' => urlencode(implode(',', $itemsDesc)),
            'items' => $items
        ];
    } else {
        return null;
    }
}

Where is the problem? I tried everything. Thanks