1. Enter debug mode

For testing manual implementation add this before initialization

R89SDK.setDebug();

We also recommend adding

R89SDK.setLogLevel(LogLevel.debug);

Full Example

R89SDK.setDebug();
R89SDK.setLogLevel(LogLevel.debug);

R89SDK.initialize(
      publisherId: "TestRefinery89ID",
      appId: "TestDemoApp",
      singleTag: false);

2. Use debug config Ids

Implement the ad formats following their guide and using debug config ids available in Flutter - Ad Formats

Example:

Widget build(BuildContext context) {
    ...
     R89Banner(configurationId: ConfigBuilder.bannerTestR89ConfigId,)
    ...
}

SDK Public Documentation

Flutter How To Test Manual Implementation

1. Enter debug mode

2. Use debug config Ids