GetShipmentItemsResponse

{
    "payload": {
        "ItemData": [
            {
                "ShipmentId": "FBA3MXN6HN",
                "SellerSKU": "SKU12345",
                "FulfillmentNetworkSKU": "X00012345",
                "QuantityShipped": 10,
                "QuantityReceived": 8,
                "QuantityInCase": 2,
                "ReleaseDate": "2025-05-26",
                "PrepDetailsList": [
                    {
                        "PrepInstruction": "Polybagging",
                        "PrepOwner": "AMAZON"
                    }
                ]
            }
        ],
        "NextToken": "string"
    }
}