ShippingLabelConverter.php

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<?php
declare(strict_types=1);

namespace Magento\Sales\Plugin;

class ShippingLabelConverter
{
    public function afterGetList(
        \Magento\Sales\Api\ShipmentRepositoryInterface $shipmentRepository,
        \Magento\Sales\Api\Data\ShipmentSearchResultInterface $searchResult
    ) {
        foreach ($searchResult->getItems() as $item) {
            if ($item->getShippingLabel() !== null) {
                $item->setShippingLabel(base64_encode($item->getShippingLabel()));
            }
        }
        return $searchResult;
    }

    public function afterGet(
        \Magento\Sales\Api\ShipmentRepositoryInterface $shipmentRepository,
        \Magento\Sales\Api\Data\ShipmentInterface $shipment
    ) {
        if ($shipment->getShippingLabel() !== null) {
            $shipment->setShippingLabel(base64_encode($shipment->getShippingLabel()));
        }
        return $shipment;
    }
}