[SOLVED] Admob in Unity game- where to place the ad code?

Like in title :

Admob- where to place the ad code?

(For Android)

I put the ad code in place:

-unused

-AndroidAdId

I did it well?

Code (CSharp):

1.  using UnityEngine;
2.          using System.Collections;
3.          using GoogleMobileAds.Api;
4. public class AdScript : MonoBehaviour
5. {
6.      InterstitialAd interstitial;
7.      bool hasShownAdOneTime;
8.      // Use this for initialization
9.      void Start()
10.      {
11.          RequestInterstitial();
12.      }
13.      void Update ()
14.      {
15.          if (TimeManager.isGameOver) {
16.              if (!hasShownAdOneTime) {
17.                  hasShownAdOneTime = true;
18.                  showInterstitialAd ();
19.              }
20.          } else {
21.              if (Gamer.isTimeToOver) {
22.                  if (!hasShownAdOneTime) {
23.                      hasShownAdOneTime = true;
24.                      showInterstitialAd ();
25.                  }
26.              }
27.          }
28.      }
29.      public void showInterstitialAd ()
30.      {
31.          if (interstitial.IsLoaded()) {
32.              interstitial.Show ();
33.          }
34.      }
35.      private void RequestInterstitial()
36.      {
37.          // These ad units are configured to always serve test ads.
38.          #if UNITY_EDITOR
39.          string adUnitId = "unused";
40.          #elif UNITY_ANDROID
41.          string adUnitId = "AndroidAdId";
42.          #elif UNITY_IPHONE
43.          string adUnitId = "unexpected_platform";
44.          #else
45.          string adUnitId = "unexpected_platform";
46.          #endif
47.          // Create an interstitial.
48.          interstitial = new InterstitialAd (adUnitId);
49.          interstitial.OnAdClosed += Interstitial_OnAdClosed;
50.          AdRequest request = new AdRequest.Builder ().Build ();
51.          interstitial.LoadAd (request);
52.          }
53.          private void Interstitial_OnAdClosed (object sender, System.EventArgs e)
54.          {
55.          RequestInterstitial ();
56.          }
57.          }

I'm asking because I put it on yesterday, but it does not work, while the test add worked