start method
Implementation
Stream<FaceAuthenticatorEvent> start() {
Map<String, dynamic> params = new Map();
params['mobileToken'] = mobileToken;
params['personId'] = personId;
params['stage'] = stage;
params['filter'] = filter;
params['enableScreenshot'] = enableScreenshot;
params['enableLoadingScreen'] = enableLoadingScreen;
params['imageUrlExpirationTime'] = imageUrlExpirationTime;
_LivenessMethodChannel.invokeMethod('start', params);
return _LivenessListenerEventChannel.receiveBroadcastStream()
.map((result) => FaceAuthenticatorEvent.fromMap(result));
}