SePay Gateway is a WordPress plugin designed to streamline the payment process for online shopping. This free plugin connects with over 15 major banks, allowing users to set up automatic payment confirmations when customers transfer funds. Key features include customizable VietQR templates for easy QR code generation and the ability to display payment information clearly for customers. Users must register an account on SePay and link their bank before utilizing the plugin.

Once a payment is made, the system provides instant feedback, notifying customers of successful transactions within 5 to 10 seconds. The admin interface also updates automatically, changing the order status from 'On-Hold' to 'Processing' and adding transaction notes that include payment amount and time. This functionality ensures a smooth user experience for both customers and merchants.