Unable to access returned object values due to protected container [container:protected]

[AnonAnon42]

I am trying to access orders and use getOrders() to receive a list of all orders.
When I execute getOrders() I receive a return like this:

AmazonPHP\SellingPartner\Model\Orders\GetOrdersResponse Object
(
    **[container:protected]** => Array
        (
            [payload] => AmazonPHP\SellingPartner\Model\Orders\OrdersList Object
                (
                    **[container:protected]** => Array
                        (
                            [orders] => Array
                                (
                                    [0] => AmazonPHP\SellingPartner\Model\Orders\Order Object
                                        (
                                            **[container:protected]** => Array
                                                (
                                                    [amazon_order_id] => 123-1234567-1234567
                                                    [seller_order_id] => 
                                                    [purchase_date] => 2022-11-24T12:45:56Z
                                                    [last_update_date] => 2022-11-24T12:34:56Z
                                                    [order_status] => Unshipped
                                                    [fulfillment_channel] => MFN
                                                    [sales_channel] => Amazon.de
                                                    [order_channel] => 
                                                    [ship_service_level] => Std DE Dom_6
                                                    [order_total] => AmazonPHP\SellingPartner\Model\Orders\Money Object
                                                        (
                                                            **[container:protected]** => Array
                                                                (
                                                                    [currency_code] => EUR
                                                                    [amount] => 12.34
                                                                )
                                                        )
(...)
                            [next_token] => 
                            [last_updated_before] => 
                            [created_before] => 2022-11-24T12:34:56Z
                        )
                )
            [errors] => 
        )
)

In the response you can see [container:protected].
I cannot access anything inside these preotect containers which makes the reponse pretty useless to me.

I don't know why these containers are protected or if I've done anything wrong in the request, but the way it is right now I can't proceed reading order details.

Can someone explain to me why these containers are protected and how I can access the information inside?
Is there a get-Function to retrieve these values?

[jasonhebert]

There is a public method to get the OrdersList payload:
public function getPayload() : ?OrdersList