The Csigafarm business, specializing in the trade of snails, fish food, and accessories, approached us with the task of updating their online store, originally built on OpenCart 2.0.1.1 a few years ago, to the latest version of OpenCart. Additionally, they requested a modernization of both the design and functionality, ensuring that all existing products and data were preserved. As part of the project, we first upgraded the OpenCart system to the latest 3.x version. Then, to modernize the appearance, we replaced the theme with a contemporary, user-friendly template that features, among other things, a "one-page checkout" system. Finally, we completed the project by optimizing the web store's functionality, delivering a modernized and efficient online store.