GreedyGameAds.Instance.LoadBanner("SDK X Banner adUnit"); 

 // To check if Banner is loaded
 GreedyGameAds.Instance.bannerAd.IsLoaded
  using UnityEngine;
  using GreedyGame;

   public class GreedyGameAdsDemoScript : MonoBehaviour
   {

     private void Start()
     {
        //after Initialize the GreedyGameAds sdk
        this.RequestBanner();  
     }

     public void RequestBanner()
     {                     
        //Creates standard Adaptive Banner at Top Position
        // After loading Banner will be shown automatically
        GreedyGameAds.Instance.LoadBanner("SDK X Banner adUnit");                  
     }

   }
GreedyGameAds.Instance.DestroyBanner(); 
 public void DestroyBannerAd()
 {
    GreedyGameAds.Instance.DestroyBanner();                               
 }

The constructor for a CreateBanner has the following parameters

GreedyGameAds.Instance.LoadBanner(adUnitId,BannerSize.STANDARD_BANNER,BannerPosition.Bottom);

Banner sizes

The table below lists the standard banner sizes.

//Available Banner Sizes

BannerSize.ADAPTIVE_BANNER;//Default BannerSize
BannerSize.STANDARD_BANNER;
BannerSize.LARGE_BANNER;
BannerSize.IAB_MEDIUM_RECTANGLE;
BannerSize.IAB_FULLSIZE_BANNER;
BannerSize.IAB_LEADERBOARD;

Size in dp(WxH)

Description

Availability

BannerSize constant

320x50

Standard Banner

Phones and Tablets

STANDARD_BANNER

320x100

Large Banner

Phones and Tablets

LARGE_BANNER

300x250

IAB Medium Rectangle

Phones and Tablets

IAB_MEDIUM_RECTANGLE

468x60

IAB Full-Size Banner

Tablets

IAB_FULLSIZE_BANNER

728x90

IAB Leaderboard

Tablets

IAB_LEADERBOARD

Provided width x Adaptive height

Adaptive banner

Phones and Tablets

ADAPTIVE_BANNER

BannerPosition

// For Top Position
 BannerPosition.Top
//For Bottom Position
 BannerPosition.Bottom

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.bannerView.OnBannerAdloaded
 GreedyGameAds.Instance.bannerView.OnBannerAdfailed
public void RequestBanner()
 {
     GreedyGameAds.Instance.LoadBanner("SDK X Banner adUnit");  

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


     // Called when an ad request failed to load.
     GreedyGameAds.Instance.bannerView.OnBannerAdfailed+= this.HandleOnAdFailed;                        
 }


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


  public void HandleOnAdFailed(string error)
  {
     MonoBehaviour.print("Failed event received with error: " + error);                         
  }