The HTTP 403 error indicates that the engineer does not have the appropriate permissions to access the endpoint. To correct this, the engineer should obtain a security token and leverage OAuth for authentication. OAuth is a widely used authorization framework for securing API endpoints, and obtaining a security token is a key step in authenticating API requests. These two steps will ensure the correct authentication process is followed, allowing access to the required API resources. CASP+ emphasizes the importance of using secure authentication mechanisms like OAuth for modern web applications and APIs. References: * CASP+ CAS-004 Exam Objectives: Domain 3.0 - Enterprise Security Architecture (API Security, OAuth) * CompTIA CASP+ Study Guide: API Security and OAuth for Authentication