The aim of this bachelor thesis is to develop a bank web application capable of processing both MT103 and pacs.008 payment types. The system will evaluate whether it is necessary to convert payments to facilitate transactions between different account types. This work includes a comprehensive review of payment types, along with the challenges and limitations associated with SWIFT and ISO standards. Essential functionalities for such systems are identified, and an overview of similar products, their adoption of ISO standards, costs, and available services are provided. The comparison of web development frameworks affirmed ASP.NET Core as the optimal choice for this project. An internal questionnaire identified critical features and prioritised payment types for the application. Based on these insights, detailed requirements and specifications were developed, leading to the creation of the application using the ASP.NET Core Blazor framework. Upon completion, the application underwent manual and unit testing to evaluate its performance and ensure it meets the outlined requirements. This thesis documents the entire development process, from theoretical research to practical implementation and testing.