Liveness
How much the holder has to do in front of the camera before the face match runs.
NONE: no liveness; the first good frame is matched (about 1 s; a printed photo would pass).
QUICK: look at the camera, then one random challenge (blink or smile). About 3-5 s. Default.
STRICT: both challenges, in random order.
FULL: the complete selfie ritual (centre, head turns, gaze, close eyes, smile, look straight, consent tick). 20-40 s; the steps are fixed.