A system and method enables sellers to define a secret shared with an on-line payment provider when listing an item or service for purchase. Consumers deposit funds into an on-line escrow or holding account before committing to a financial on-line transaction or purchase. Once an item is located, the consumer may contact the seller for additional information. By placing funds in escrow, the seller may be more willing to spend the time and effort to deal with the consumer. The consumer, in turn, receives more information to make a purchasing decision. If the transaction is to he completed, the consumer instructs the payment provider maintaining the escrow account to release the funds to the seller's account. The seller is notified by the payment provider, where the notification includes the secret. This enables the seller to authenticate the confirmation message.