Load Leadbolt ad before exiting from Game Unity3d

Hello everyone ,

I have integrated Unity Android SDK ffor LeadBolt. My ad is loading/working on start.

But i want to load ad before killing my game.

But idont finding the way thet the ad is loaded or not. so that i can kill my game.

script i have written is here:

using UnityEngine; using System.Collections;

 public class LoadAd : MonoBehaviour {
 
     // Use this for initialization
     void Start () {
     
     }
     
     // Update is called once per frame
     void Update () {
          if (Input.GetKeyDown(KeyCode.Escape)) 
          {
              Ad();
           }     
     }
     
     IEnumerator Ad()
     {
         AndroidJavaClass jc = new AndroidJavaClass("com.unity3d.player.UnityPlayer"); 
         AndroidJavaObject jo = jc.GetStatic<AndroidJavaObject>("currentActivity");                    
         using(AndroidJavaObject ad = new AndroidJavaObject("com.unity.wrapper.LeadBoltUnity", jo))
         {
             ad.Call("loadAd","837124071");
             yield return new WaitForSeconds (5.0f);
             System.Diagnostics.Process.GetCurrentProcess().Kill();
         }
     }
 }

Thanks In advance for your support and help..