VKYC liveness checkDescription: checks that the selfie is a real face, not a blank frame.Usage: VKYC screen, after the customer has an open application. Call this before face-match. It does not move the journey step.Details: body { image } — JPEG or PNG as base64. A data:image/...;base64, prefix is fine. { live: true } means a face was found. { live: false } means retake the selfie (face not in the frame). Empty or non-image text is 422.Next:POST /application/vkyc/face-match with the same selfie plus the ID portrait.Auth:Authorization: Bearer {{accessToken}}Errors:401 unauthorized | session_expired · 404 not_found · 422 validation_failed | provider_failed