Liveness Detection — Selfie

Post a selfie and get back a liveness verdict with the individual signals behind it — whether a person was found, whether more than one was, and whether the image looks like a screen, a printed photo or a document held up to the camera.

• Every field on liveness_analysis is optional. The upstream shape isn't a published contract, so a key that stops arriving degrades the report rather than failing the call — read defensively and treat a missing signal as unknown, not as passed.