newsupernova/vendor/temando/module-shipping-m2/etc/webapi_rest/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Temando\Shipping\Rest\Authentication">
        <arguments>
            <argument name="session" xsi:type="object">Temando\Shipping\Model\Session\NullSession</argument>
        </arguments>
    </type>
</config>