An application engineer is using the Swagger framework to leverage REST APIs to authenticate endpoints.

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.