In this paper, the design and implementation of a secure payment system based on QR codes will be covered. In recent years, QR codes have been widely used due to their capacity to speed up payments and provide customers with the highest comfort. Yet, as convenient as QR-based online payment systems may seem, they are vulnerable to a variety of attacks. Transaction processing needs to be adequately secure in order to protect the privacy and accuracy of each payment operation. The online payment system must also guarantee the legitimacy of each transaction for both the sender and the recipient. This article offers security for the proposed QR-based system using visual cryptography. The recommended solution consists of a mobile application and a payment gateway server that employs visual cryptography. Customers who use the application may conduct financial transactions in a secure environment thanks to its clear and user-friendly layout.