Unity reward add multiplying reward

I implemented the Unity reward ad. I have a button at the start of each level. If you watch the ad you get the reward. This works and I get the reward. The issue is it works once before level one. But before level 2 it gives the reward twice. Before level 3 it gives the reward 3 times.

I have debugged it and it is going through the the OnUnityAdsDidFinish function multiple times. I don't know why.

Code (CSharp):

1. using UnityEngine;
2. using UnityEngine.UI;
3. using UnityEngine.Advertisements;
4.  
5. namespace deathToZombies
6. {
7.     [RequireComponent(typeof(Button))]
8.     public class RewardedAdsButton : MonoBehaviour, IUnityAdsListener
9.     {
10.  
11. #if UNITY_IOS
12.     private string gameId = "1486551";
13. #elif UNITY_ANDROID
14.         private string gameId = "1486550";
15. #endif
16.  
17.         Button myButton;
18.         public string myPlacementId = "rewardedVideo";
19.         private float levelCheck;
20.  
21.         void Start()
22.         {
23.             myButton = GetComponent<Button>();
24.  
25.             // Set interactivity to be dependent on the Placement’s status:
26.             myButton.interactable = Advertisement.IsReady(myPlacementId);
27.  
28.             // Map the ShowRewardedVideo function to the button’s click listener:
29.             if (myButton) myButton.onClick.AddListener(ShowRewardedVideo);
30.  
31.             // Initialize the Ads listener and service:
32.             Advertisement.AddListener(this);
33.             Advertisement.Initialize(gameId, true);
34.         }
35.  
36.         // Implement a function for showing a rewarded video ad:
37.         void ShowRewardedVideo()
38.         {
39.             Advertisement.Show(myPlacementId);
40.         }
41.  
42.         // Implement IUnityAdsListener interface methods:
43.         public void OnUnityAdsReady(string placementId)
44.         {
45.             // If the ready Placement is rewarded, activate the button:
46.             if (placementId == myPlacementId)
47.             {
48.                 myButton.interactable = true;
49.             }
50.         }
51.  
52.         public void OnUnityAdsDidFinish(string placementId, ShowResult showResult)
53.         {
54.             // Define conditional logic for each ad completion status:
55.             if (showResult == ShowResult.Finished)
56.             {
57.                 Debug.Log("I have rewarded me!!!");
58.                 levelCheck = SpawnManager.level;
59.                 if (levelCheck % 5 == 0)
60.                 {
61.                     SpawnManager.saveToken++;
62.                 }
63.                 else
64.                 {
65.                     SpawnManager.slowMoToken++;
66.                 }
67.             }
68.             else if (showResult == ShowResult.Skipped)
69.             {
70.                 // Do not reward the user for skipping the ad.
71.             }
72.             else if (showResult == ShowResult.Failed)
73.             {
74.                 Debug.LogWarning("The ad did not finish due to an error.");
75.             }
76.         }
77.  
78.         public void OnUnityAdsDidError(string message)
79.         {
80.             // Log the error.
81.         }
82.  
83.         public void OnUnityAdsDidStart(string placementId)
84.         {
85.             // Optional actions to take when the end-users triggers an ad.
86.         }
87.     }
88. }

 

Do I need to remove the listener after the reward is given?

EDIT: I removed the listener and it seemed to work. However I am not sure if this the correct way to handle this issue.

 

I am using 3.4.4


I don't destroy the button, I set the enabled to false and then to true. Not sure if that would contribute to the problem.