The payment for goods or services through internet are popular nowaday, but the major of transactions for high value that appear in other researchs are not safe enough. So, in this article, the researcher has proposed a payment system through an agent (Agent-Based Server) for high-value transactions will be an intermediary in the transaction between the customer and the merchant and financial institution of customers and merchants. We proposed protocol that is used in high-value payments by use Symmetric Encryption application in order to maintain confidentiality and the Hash Functions can detect any changes during the transmission of data across the network and increase security in the transaction even more