GreedyGameAds.Instance.LoadAppOpen("SDK X AppOpen adUnit");

 //To check if AppOpen is loaded
 GreedyGameAds.Instance.appOpenAd.IsLoaded

using UnityEngine;
using GreedyGame;

 public class GreedyGameAdsDemoScript : MonoBehaviour
 {

    private void Start()
    {
        //after Initialize the GreedygameAds sdk
        this.LoadAppOpenAd();
    }

    public void LoadAppOpenAd()
    {
        GreedyGameAds.Instance.LoadAppOpen("SDK X AppOpen adUnit");
    }

 }

 GreedyGameAds.Instance.ShowAppOpen();

 void Start()
 {
     . . .
     . . .
     this.ShowAppOpenAd();
 }

 //After AppOpen Method Loaded
 public void ShowAppOpenAd()
 { 
    GreedyGameAds.Instance.ShowAppOpen();   
 }
 

To further customize the behavior of your ad, you can hook into a number of events in the ad's lifecycle: loading, opening, closing, and so on. Listen for these events by registering a delegate for the appropriate EventHandler, as shown below

GreedyGameAds.Instance.appOpenAd.OnAdloaded
GreedyGameAds.Instance.appOpenAd.OnAdFailedToLoad
GreedyGameAds.Instance.appOpenAd.OnAdOpened
GreedyGameAds.Instance.appOpenAd.OnAdClosed
GreedyGameAds.Instance.appOpenAd.OnAdShowFailed

  public void LoadAppOpenAd()
  {

       GreedyGameAds.Instance.LoadAppOpen("SDK X AppOpen adUnit");  

       // Called when an ad request has successfully loaded.
       GreedyGameAds.Instance.appOpenAd.OnAdloaded += this.HandleOnAdLoaded;

       // Called when an ad request failed to load.
       GreedyGameAds.Instance.appOpenAd.OnAdFailedToLoad= this.HandleOnAdFailedToLoad;

       // Called when an ad is clicked.
       GreedyGameAds.Instance.appOpenAd.OnAdOpened+= this.HandleOnAdOpened;

       // Called when the user returned from the app after an ad click.
       GreedyGameAds.Instance.appOpenAd.OnAdClosed += this.HandleOnAdClosed;

       // Called when the ad Failed to show
       GreedyGameAds.Instance.appOpenAd.OnAdShowFailed += this.HandleOnAdShowFailed;

   }


  public void HandleOnAdLoaded()
  {
      MonoBehaviour.print("HandleAdLoaded event received");
  }

  public void HandleOnAdFailedToLoad(string error)
  {
      MonoBehaviour.print("HandleFailedToLoad event received with message: " +error);                           
  }

  public void HandleOnAdOpened()
  {
      MonoBehaviour.print("HandleAdOpened event received");
  }

  public void HandleOnAdClosed()
  {
      MonoBehaviour.print("HandleAdClosed event received");
  }

  public void HandleOnAdShowFailed()
  {
      MonoBehaviour.print("HandleAdShowFailed event received");
  }