Langflow, a low-code framework, enables developers and non-developers to build AI applications with a visual, drag-and-drop interface, primarily focusing on secure handling of sensitive data such as financial information in AI-driven workflows. The guide outlines a comprehensive method for developing a secure flight booking system using Langflow and the authorization service Permit.io. This involves implementing four critical security perimeters: Prompt Filtering, RAG Protection, Secure External Access, and Response Enforcement. These safeguards ensure that only authorized users can access and modify flight and booking data, enhancing trust and protecting user information. The tutorial demonstrates the creation of three specific workflows—flight search, information queries, and booking operations—by integrating Langflow’s AI capabilities with Permit.io’s fine-grained access control to manage and protect sensitive travel data, while maintaining a seamless user experience. The setup also includes configuring Attribute-Based Access Control (ABAC) policies and utilizing Permit.io to restrict data access according to user attributes like membership tier, region, and verification status, highlighting a structured approach to securing AI applications.