Sourcefire accepts credit cards (Visa, MasterCard, and American Express) and company purchase orders that are accompanied by a signed Sourcefire sales order document. If you use a credit card, we will charge your card in U.S. currency when the order is received. Training credits and/or registrations must be used within six months from the date of acquisition or will result in forfeiture of class credits; tuition is nonrefundable. Pricing, registration terms, and conditions are subject to change without notice.