This guide provides detailed instructions for configuring external users to access the Firewall Threat Defense REST API using RADIUS authentication. It outlines the version requirements, specifically that Firewall Threat Defense version 6.3(0) or higher is necessary. The document explains the process of setting up RADIUS accounts, defining authorization levels, and configuring the device for external AAA. It includes a step-by-step procedure for defining authorization rights, creating RADIUS server objects, and establishing a AAA server group. The guide also addresses operational considerations, such as high availability configurations and user object creation. Additionally, it details the attributes needed for RADIUS server configuration and the expected responses from the system during the setup process. This comprehensive approach ensures that users can be authenticated and authorized effectively while maintaining secure access to the API.