Invoice Object
(
    [status:protected] => InvoiceStatus Enum
        (
            [name] => created
        )

    [number:protected] => 1
    [Lines:protected] => Invoicelines Object
        (
            [lines:protected] => Array
                (
                    [0] => Array
                        (
                            [amount] => 2
                            [name] => 1 TB SSD
                            [pieceprice] => 42.5
                        )

                )

        )

)