services.billing.entities.v1alpha2.Invoice(Invoice)

{
    "billing_cycle": "string",
    "create_time": "1s",
    "items": [
        {
            "client_id": "string",
            "product": "PRODUCT_UNSPECIFIED",
            "description": "string",
            "date": "1s",
            "price": 0,
            "columns": [
                {
                    "name": "string",
                    "value": "string"
                }
            ],
            "rated_amount": {
                "value": "string"
            },
            "product_id": "string"
        }
    ],
    "download_url": "string"
}