Get Unpaid Invoices Summary

{
    "success": true,
    "message": "Unpaid invoices summary fetched successfully!",
    "data": {
        "dueIn7Days": {
            "totalUnformattedAmount": 0,
            "totalAmount": "£ 0.00"
        },
        "dueIn8To14Days": {
            "totalUnformattedAmount": 0,
            "totalAmount": "£ 0.00"
        },
        "dueIn14PlusDays": {
            "totalUnformattedAmount": 0,
            "totalAmount": "£ 0.00"
        }
    }
}