The paper briefly explains the concept of electronic business. The paper describes the characteristics and trends of online commerce. After that, the advantages and disadvantages of online shopping are described. The following section describes online payment forms. Payments range from card to cash on delivery, check and digital gift cards. Furthermore, we are introduced to Payment Gateway for online commerce, which can be identified with the POS system in physical commerce. The following are described as parts of the online card payment system: the online card payment process, types of card charging, and steps and ways of integrating online card payment. It is then described how to achieve security when paying online. The following section describes the technologies used to create the application subsystem. The technologies used are: HTML, CSS, PHP, JavaScript and SQL. Requirements are used for design and engineering, which are divided into: functional, non-functional and interface requirements. The data design is further presented using: class diagrams, business functions, and component-requirement models. Data are represented using a data model and an object model. The data model is represented by a logical and physical model and an entity-event matrix. The object model is presented in the form of an activity diagram and use cases for the diagram are described. The following section describes the use of the application subsystem. The implementation of the subsystem is presented using layout diagrams. The application subsystem is presented using images and descriptions of functionality, and it is compared with existing solutions. At the very end, a conclusion on the work is made.