Operational debt demand notice requires repayment or dispute within ten days before initiating corporate insolvency proceedings. Form 3 prescribes the demand notice content and supporting particulars an operational creditor must send before filing under section 9: total debt and transaction details, amount in default with computations, security or retention of title particulars, record of default with any information utility, governing law or contract, and attached proof documents. The notice requires the corporate debtor to either notify pre-existing litigation or arbitration or prove repayment by attested transaction records within ten days. The creditor may attach an information utility certificate of no dispute and must demand unconditional repayment within ten days, warning of initiation of corporate insolvency resolution if unpaid; a served copy must be appended to the section 9 application.