Adtapsy help

I've integrated Adtapsy into my game and enabled testmode yet I do not get any adverts? Has anyone got a full detailed explanation on how to integrate it not including the one provided by Adtapsy This is my Adscript:

 using UnityEngine;
 
 public class Adverts : MonoBehaviour
 {
     public static Adverts manager;
 
     void Awake()
     {
         manager = this;
     }
 
     void Start()
     {
         AdTapsy.SetTestMode(true, "Simulator", "xxxxxxxxxxxxxxxxx");
 
         AdTapsy.OnAdClicked += delegate (int zoneId)
         {
             if (zoneId == AdTapsy.InterstitialZone)
             {
                 ClickCounter.manager.SeenAdReady4New();
             }
         };
         AdTapsy.OnAdSkipped += delegate (int zoneId)
         {
             if (zoneId == AdTapsy.InterstitialZone)
             {
                 ClickCounter.manager.Ready4Ad();
             }
         };
         AdTapsy.OnAdFailedToShow += delegate (int zoneId)
         {
             if (zoneId == AdTapsy.InterstitialZone)
             {
                 ClickCounter.manager.Failed2ShowAd();
             }
         };
     }
 
     public void ShowInterstitial()
     {
         if (AdTapsy.IsInterstitialReadyToShow())
         {
             AdTapsy.ShowInterstitial();
         }
     }
 
 }