public class MyEvent : IEvent
{
    public string Message;
    
    public MyEvent(string message)
    {
        Message = message;
    }
}

public class EventTester : MonoBehaviour
{
    private IEventService _eventService;
    
    private void Awake()
    {
        _eventService = new EventService();

        _eventService.Subscribe<MyEvent>(DoSomething);

        _eventService.FireEvent(new MyEvent("Event fired"));
    }

    private void DoSomething(MyEvent eventData)
    {
        Debug.Log(eventData.Message);
    }

    private void OnDisable()
    {
        _eventService.Unsubscribe<MyEvent>(DoSomething);
    }
}