Chartboost check interstitial has been closed

Hi all,

To try and keep this simple, we have a game where when the player dies an interstitial will appear and we would like to find a way to check when the interstitial has been closed and then from this reload the game for the player.

I think we are looking for something like a bool, hasClosed for instance, or a way to make one, but we have been unable to work out how this would be implemented with chartboost.

 using UnityEngine;
 using System.Collections;
 using ChartboostSDK;
 
 public class ChartboostPersistentObject : MonoBehaviour
 {
 
     private GameManager gm;
    
     void Awake()
     {
         // Fill gameManager.
         GameObject tempGm = GameObject.Find("GameManager");
         gm = (GameManager)tempGm.GetComponent(typeof(GameManager));
     }
 
     void Start()
     {
         // fill the cache.
         Chartboost.cacheInterstitial(CBLocation.Default);
     }
 
     void Update()
     {
         // If player is dead & they have player the tutorial & they have not yet
         // touched the screen (This was to stop multiple ads), then show ad.
         if(gm.isDead && gm.playCount >= 1 && gm.touchCount == 0)
         {
             Chartboost.showInterstitial(CBLocation.Default);
             // Now increase touchCount to stop any further ads showing.
             gm.touchCount++;
         }        
     }
 
     // My understanding was that this would return that the interstitial has been dismissed.
     void OnMouseUp()
     {
         Chartboost.didDismissInterstitial += didDismissInterstitial;
     }
 
     // Which would then relay to this function that it has been closed
     // thus allowing me to control the bool value for the closed check. 
     void didDismissInterstitial(CBLocation location)
     {
         gm.activeAd = false;
     }
 }

Above is the important code I am working with for the ads. The top part of the code all works fine and the bottom is where I have no idea what I am doing and I am just going by what my understanding of Chartboosts documentation provides. I have included comments in the code to explain my understanding and what I think it is doing / why I have done it.