Online payment system and method

The invention discloses an online payment system and method. The online payment system comprises a server unit, an account maintenance unit, a CA accreditation and data encryption unit, an order generating and inquiring unit, an order sending gateway unit and an order state alternation informing unit. Networks, computers, communication, data encryption and other technologies are fully integrated in the method, data are integrated into a complete order through a service system, protocol payment is assigned, after a digital certificate is completed through a CA, the order is encrypted through a DES algorithm, and the order is sent to a bank gateway. Thus, safe, complete and reliable bank order data transmission is achieved, a new mode of payment in the Internet environment is achieved through the method, and the mode is safe, reliable, low in cost and needless of offline operation and is an emerging service operation mode of enterprises. The method is suitable for the bank protocol payment transactions of the enterprises and has the advantages of being fast and direct, and the data safety in the whole process is ensured through the CA certificate.