An GSD payment system is an Internet-based method of processing economic transactions. This system is a simple way to transfer the money. It allows a vendor to accept payments over the web or over other Internet connections, such as direct database connections between retail stores and their suppliers--a common method of maintaining just-in-time inventories. Online payment systems greatly expand the reach of a business and its ability to make sales. A payment system is any system used to settle financial transactions through the transfer of monetary value, and includes the institutions, instruments, people, rules, procedures, standards, and technologies that make such an exchange possible. An e-payment system is a way of making transactions or paying for goods and services through an electronic medium, without the use of checks or cash. It’s also called an electronic payment system or online payment system. The electronic payment system has grown increasingly over the last decades due to the growing spread of internet-based banking and shopping. As the world advances more with technology development, we can see the rise of electronic payment systems and payment processing devices.