The Vonage Video API has introduced Secure Callbacks, a feature that provides an additional layer of security for webhook callback requests, protecting against unauthorized callbacks and ensuring compliance with specific industry requirements. To enable this feature, developers can toggle the Secured Callback slider button to "on" in the Project Settings section of their video project, and configure their callback URL and signature secret. Secure Callbacks verifies the authenticity of request headers and payloads, including a JWT that includes a signature secret corresponding to the `api_key` included in the JWT claims. This ensures that requests originate from Vonage and have not been tampered with during transit, defending against intercept and replay attacks.