Code of Federal Regulations Title 41. Public Contracts and Property Management § 41.102–38.290 What types of payment may we accept?

(a) U.S. currency or any form of credit instrument made payable on demand in U.S. currency, e.g., cashier's check, money order. Promissory notes and postdated credit instruments are not acceptable.

(b) Irrevocable commercial letters of credit issued by a United States bank payable to the Treasurer of the United States or to the Government agency conducting the sale.

(c) Credit or debit cards.