/refund full request payload

{
    "documentExtID": "REFUND-1001",
    "docTime": "2026-06-10 15:00:00",
    "docNumber": "POS-001-R1001",
    "employeeName": "John Doe",
    "employeeFirstName": "John",
    "employeeLastName": "Doe",
    "items": [
        {
            "itemId": "SKU-001",
            "itemName": "Coffee",
            "itemUnit": "pcs",
            "itemQty": 1000,
            "itemAmount": 12500,
            "itemTaxes": [
                {
                    "taxCode": "A",
                    "taxPrc": 1200
                }
            ]
        }
    ],
    "payments": {
        "cashAmount": 0,
        "cashlessAmount": 12000,
        "creditAmount": 0,
        "bonusesAmount": 0,
        "prepaymentAmount": 0
    },
    "extraPayments": [
        {
            "code": "M",
            "amount": 500,
            "trxParams": {
                "rrn": "123456789012",
                "cardNumber": "8600********1234",
                "bankName": "DemoBank"
            }
        }
    ],
    "parentDocID": "FISCAL-000001",
    "parentDocNum": "000001"
}