Batch having Dispatcher and random key-value pair

curl --location 'https://api.fourkites.com/load/update/dispatcher-api/async' \
--header 'Content-Type: application/json' \
--header 'apikey: testkey' \
--data '{
    "updates": [
        {
            "timeZone": "UTC",
            "randomText1": "randomText1value",
            "identifierKeys": [
                {
                    "identifier": "Load reference #1",
                    "randomText2": "randomText2value",
                    "randomText3": "randomText3value"
                }
            ],
            "assignmentUpdate": {
                "operatingCarrierScac": "Operating Carrier SCAC ID",
                "truckNumber": "Truck Number as in the GPS/ELD portal",
                "randomText4": "randomText4value",
                "randomText5": "randomText5value"
            }
        }
    ]
}'