Which action in Flow Designer allows integration with external systems?

The action that allows integration with external systems in Flow Designer is the HTTP Request action. This action is specifically designed to facilitate communication between ServiceNow and external APIs or services over the web. By using HTTP requests, users can send or receive data to and from these external systems, enabling a wide range of integrations, such as retrieving or pushing information to third-party applications.

HTTP Request supports various HTTP methods like GET, POST, PUT, and DELETE, which correspond to the common operations performed in web development and API interactions. This flexibility makes it an essential tool for developers and administrators who need to connect ServiceNow with different platforms, applications, or services seamlessly.

The other actions, while useful in their own contexts, do not provide direct mechanisms for external system integration. Creating a record, sending a notification, or updating a record are confined to operations within the ServiceNow environment itself and do not facilitate the exchange of data with external systems.