{"status":"Fictional arithmetic example; not VaniAgent billing terms or an actual invoice","currency":"INR","ratePerMinute":4.5,"perCallIncrementSeconds":60,"calls":[{"id":"demo-billing-001","connectedSeconds":61,"billedMinutes":2,"beforeTax":9},{"id":"demo-billing-002","connectedSeconds":59,"billedMinutes":1,"beforeTax":4.5}],"usageBeforeTax":13.5,"realContractRequired":["rounding scope","failed-attempt charges","transfer legs","credits","tax","adjustments"]}