Resolved How to implement in-game review popup?

Hi, I'm trying to implement in-game review pop up without leaving the game. using google play services.

I installed:
-> com.google.play.core-1.8.1.unitypackage
-> com.google.play.review-1.8.1.unitypackage

But whenI'm creating the reviewManger

Code (CSharp):

1. using System.Collections;
2. using UnityEngine;
3. using Google.Play.Review;
4.  
5. public class ReviewManager : MonoBehaviour
6. {
7.     private ReviewManager _reviewManager;
8.     private PlayReviewInfo _playReviewInfo;
9.  
10.     public void RequestReviewFlow()
11.     {
12.         _reviewManager = new ReviewManager();
13.         var requestFlowOperation = _reviewManager.RequestReviewFlow();
14.         requestFlowOperation.Completed += OnRequestFlowComplete;
15.     }
16.  
17.     private void OnRequestFlowComplete(OperationResult<ReviewInfo> result)
18.     {
19.         if (result.Error != ReviewErrorCode.NoError)
20.         {
21.             // Error handling
22.             return;
23.         }
24.         _playReviewInfo = result.GetResult().PlayReviewInfo;
25.         LaunchReviewFlow();
26.     }
27.  
28.     public void LaunchReviewFlow()
29.     {
30.         if (_playReviewInfo == null)
31.         {
32.             // Error handling
33.             return;
34.         }
35.         var launchFlowOperation = _reviewManager.LaunchReviewFlow(_playReviewInfo);
36.         launchFlowOperation.Completed += OnLaunchFlowComplete;
37.     }
38.  
39.     private void OnLaunchFlowComplete(OperationResult result)
40.     {
41.         // Review flow finished, no indication of whether the user reviewed or not.
42.     }
43. }

I got only red lines for missing references...

It will be nice to see a tutorial to show how to implement it, an example of it.
There is no examples

 

I already fixed , and I want to post it for those who maybe have struggles like me

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using System.Collections;
4. using Google.Play.Review;
5.  
6. public class ReviewController : MonoBehaviour
7. {
8.     private ReviewManager _reviewManager;
9.     private PlayReviewInfo _playReviewInfo;
10.  
11.     void Start()
12.     {
13.         _reviewManager = new ReviewManager();
14.     }
15.  
16.     public void RequestReview()
17.     {
18.         StartCoroutine(RequestReviewCoroutine());
19.     }
20.  
21.     IEnumerator RequestReviewCoroutine()
22.     {
23.         var requestFlowOperation = _reviewManager.RequestReviewFlow();
24.         yield return requestFlowOperation;
25.  
26.         if (requestFlowOperation.Error != ReviewErrorCode.NoError)
27.         {
28.             Debug.Log($"Error requesting review: {requestFlowOperation.Error}");
29.             yield break;
30.         }
31.  
32.         _playReviewInfo = requestFlowOperation.GetResult();
33.         StartCoroutine(LaunchReviewCoroutine());
34.     }
35.  
36.     IEnumerator LaunchReviewCoroutine()
37.     {
38.         var launchFlowOperation = _reviewManager.LaunchReviewFlow(_playReviewInfo);
39.         yield return launchFlowOperation;
40.  
41.         _playReviewInfo = null;
42.  
43.         if (launchFlowOperation.Error != ReviewErrorCode.NoError)
44.         {
45.             Debug.Log($"Error launching review: {launchFlowOperation.Error}");
46.             yield break;
47.         }
48.  
49.         Debug.Log("Review launched successfully");
50.     }
51. }
52.  

I hope this will help other people!