ExpenseResponse

{
    "expense_id": "string",
    "block": {
        "block_id": "string",
        "name": "string",
        "category": {
            "level1": {
                "category_id": "string",
                "name": "string"
            },
            "level2": {
                "category_id": "string",
                "name": "string"
            },
            "level3": {
                "category_id": "string",
                "name": "string"
            }
        }
    },
    "items": [
        {
            "expense_item_id": "string",
            "name": "string",
            "cost": 0
        }
    ]
}