CSVUploadResponse

{
    "data": {
        "upload_id": "upload_xyz789",
        "rows_count": 45,
        "total_amount": "22500.00",
        "validation_errors": [
            {
                "row": 5,
                "field": "amount",
                "error": "Invalid amount format"
            }
        ],
        "expires_at": "2019-08-24T14:15:22.123Z"
    }
}