using Tobii.EyeTracking;
using System.Collections.Generic;
...

public class ExampleClass : MonoBehaviour
{
    private IDataProvider<GazePoint> _gazePointProvider;
    private ITimestamped _lastHandledPoint;

    OnStart()
    {
        _gazePointProvider = EyeTrackingHost.GetInstance().GetGazePointDataProvider();
    }

    OnEnable()
    {
        // Start the provider with the game object's instance ID as a unique token
        _gazePointProvider.Start(gameObject.GetInstanceID());
    }

    OnDisable()
    {
        // Request to stop the provider for this unique token
        _gazePointProvider.Stop(gameObject.GetInstanceID());
    }

    Update()
    {
        // Handle single gaze point:
        GazePoint last = _gazePointProvider.Last; // the last data point received from the eye tracker
        GazePoint frameConsistent = _gazePointProvider.GetFrameConsistentDataPoint() // same as EyeTracking.GetGazePoint()
        // ...
        
        // Or handle all gaze points from the eye tracker:
        IEnumerable<GazePoint> pointsSinceLastHandled = _gazePointProvider.GetDataPointsSince(_lastHandledPoint);
        foreach (point in pointsSinceLastHandled)
        {
            // handle each point that has arrived since previous Update()
            // ...
        }
        _lastHandledPoint = pointsSinceLastHandled.Last();
    }
}