@override
  Widget build(BuildContext context) => Scaffold(
    appBar: ...,
    body: Column(children: [
      ...
      R89Banner(
          configurationId: ConfigBuilder.bannerTestR89ConfigId),
      ...
    ],),
  );

Your configurationId will be provided to you during onboarding process by email, you can also retrieve them from the web interface after login.

They can be many or none depending on your requests, if you need one or more please request them to your account manager or technical account manager.

@override
  Widget build(BuildContext context) => Scaffold(
    appBar: ...,
    body: Column(children: [
      ...
      R89Banner(
              configurationId: ConfigBuilder.bannerTestR89ConfigId,
              lifecycleCallbacks: BannerEventListener.callbacks(
                  onLoadedCallback: () {},
                  onImpressionCallback: () {},
                  onLayoutChangeCallback: (width, height) {},
                  onClickCallback: () {},
                  onOpenCallback: () {},
                  onCloseCallback: () {},
                  onFailedToLoadCallback: (error) {},)
            ),
      ...
    ],),
  );