handle_dynamic_link.dart

void initState() {
  super.initState();
  _retrieveDynamicLink();
}

Future<void> _retrieveDynamicLink() async {
  final PendingDynamicLinkData data = await FirebaseDynamicLinks.instance.retrieveDynamicLink();
  final Uri deepLink = data?.link;

  if (deepLink != null) {
    // to get the parameters we sent
    // to get what link it is use deepLink.path
    print(deepLink.path);
    String code = deepLink.queryParameters['code'];
    // perform your navigation operations here
  }
}