 
                [✅ Spigot | ✅ Paper] Awesome world generation, fully customizable worlds and more
@Override
    public void onEnable() {
        StratosAPI.getInstance().registerExtension(new YourExtensionClass());
    }public class YourExtensionClass extends StratosExtension {
public YourExtensionClass() {
        super("YourExtension");
    }
@Override
    public void activate(int x, int z, ChunkGenerator.ChunkData chunkData, int seed, World world) {
// modify the chunk data here
    }
}