Open banking is transforming the financial services industry by enabling seamless integrations between applications using publicly available APIs. To realize its full potential, developers must prioritize API testing and security to ensure reliable and secure integrations. The European Union's PSD2 directive and the UK's Open Banking initiative require financial institutions to provide open APIs for third-party developers, making compliance a legal requirement. As a result, API testing will become increasingly complex due to continuous evolution of open banking apps, requiring developers to perform continuous tests and leverage cloud-based API testing for scalability and security.