Legal tender: payment options for National Savings Certificates include cash, cheque, bank withdrawal and electronic modes. Rule 7 designates the acceptable modes of payment for purchasing National Savings Certificates: cash; locally executed cheque, pay order or demand draft drawn in favour of the postmaster; withdrawal from a post office savings bank account by presenting a signed withdrawal form with the pass book; surrender of a matured certificate discharged as received through issue of a fresh certificate; and, where applicable, payment by electronic mode at post offices operating on a Core Banking Solution platform.