Operational debt demand notice governs how a corporate debtor must respond to default under insolvency law. An operational creditor, on occurrence of default, may serve a demand notice or copy of the unpaid invoice on the corporate debtor in the prescribed form and manner, requiring payment of the operational debt. Within ten days of receipt, the corporate debtor must notify the operational creditor of either the existence of a dispute and any pending suit or arbitration filed before receipt of the notice or invoice in relation to that dispute, or proof that the unpaid debt has been paid by electronic transfer or by encashment of a cheque issued by the corporate debtor.