Unity Ad Monetization Guide using Unity LevelPlay: SDK Setup & Integration (Part 1)

dependencies {
    implementation 'com.google.android.gms:play-services-ads-identifier:18.0.1'
}

using System;
using UnityEngine;
using com.unity3d.mediation;

public class LevelPlayAdManager : MonoBehaviour
{
    private static LevelPlayAdManager instance;
    public static LevelPlayAdManager Instance => instance;

    [Header("LevelPlay App Keys")]
    [SerializeField] private string androidAppKey = "1a2b3c4d";
    [SerializeField] private string iOSAppKey = "4d3c2b1a";

    [Header("Ad Unit IDs")]
    [SerializeField] private string interstitialAdUnitId = "Interstitial_Android";
    [SerializeField] private string bannerAdUnitId = "Banner_Android";

    private LevelPlayInterstitialAd interstitialAd;
    private LevelPlayBannerAd bannerAd;
    private string appKey;

    private void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }
        instance = this;
        DontDestroyOnLoad(gameObject);
    }

    private void Start()
    {
        InitializeLevelPlay();
    }

    // =========================================================================
    // SECTION A: SDK INITIALIZATION
    // =========================================================================
    private void InitializeLevelPlay()
    {
#if UNITY_IOS
        appKey = iOSAppKey;
#elif UNITY_ANDROID
        appKey = androidAppKey;
#else
        appKey = androidAppKey;
#endif

        Debug.Log($"[LevelPlay] Initializing LevelPlay SDK with App Key: {appKey}");

        // Subscribe to Initialization Events
        LevelPlay.OnInitSuccess += OnLevelPlayInitSuccess;
        LevelPlay.OnInitFailed += OnLevelPlayInitFailed;

        // Initialize LevelPlay SDK
        LevelPlay.Init(appKey);
    }

    private void OnLevelPlayInitSuccess(LevelPlayConfiguration config)
    {
        Debug.Log("[LevelPlay Success] LevelPlay SDK Initialized Successfully!");
        
        // Setup Interstitial & Banner Ads
        CreateInterstitialAd();
        CreateBannerAd();
    }

    private void OnLevelPlayInitFailed(LevelPlayInitError error)
    {
        Debug.LogError($"[LevelPlay Error] SDK Initialization Failed: {error.ErrorCode} - {error.ErrorMessage}");
    }

    // =========================================================================
    // SECTION B: INTERSTITIAL ADS
    // =========================================================================
    private void CreateInterstitialAd()
    {
        interstitialAd = new LevelPlayInterstitialAd(interstitialAdUnitId);

        // Register Event Listeners
        interstitialAd.OnAdLoaded += (adInfo) => Debug.Log($"[LevelPlay] Interstitial Loaded: {adInfo.AdUnitId}");
        interstitialAd.OnAdLoadFailed += (error) => Debug.LogError($"[LevelPlay] Interstitial Load Failed: {error.ErrorMessage}");
        interstitialAd.OnAdDisplayed += (adInfo) => Debug.Log("[LevelPlay] Interstitial Displayed");
        interstitialAd.OnAdClosed += (adInfo) => 
        {
            Debug.Log("[LevelPlay] Interstitial Closed. Preloading next ad...");
            interstitialAd.LoadAd(); // Auto-preload next interstitial
        };

        // Load Initial Interstitial
        interstitialAd.LoadAd();
    }

    public void ShowInterstitialAd()
    {
        if (interstitialAd != null && interstitialAd.IsAdReady())
        {
            Debug.Log("[LevelPlay] Showing Interstitial Ad...");
            interstitialAd.ShowAd();
        }
        else
        {
            Debug.LogWarning("[LevelPlay Warning] Interstitial Ad is not ready to show.");
        }
    }

    // =========================================================================
    // SECTION C: BANNER ADS
    // =========================================================================
    private void CreateBannerAd()
    {
        bannerAd = new LevelPlayBannerAd(bannerAdUnitId, LevelPlayBannerSize.BANNER, LevelPlayBannerPosition.BOTTOM);
        bannerAd.OnAdLoaded += (adInfo) => Debug.Log("[LevelPlay] Banner Loaded Successfully.");
        bannerAd.OnAdLoadFailed += (error) => Debug.LogError($"[LevelPlay] Banner Load Failed: {error.ErrorMessage}");
    }

    public void ShowBanner()
    {
        if (bannerAd != null)
        {
            bannerAd.LoadAd();
            bannerAd.ShowAd();
        }
    }

    public void HideBanner()
    {
        if (bannerAd != null)
        {
            bannerAd.HideAd();
        }
    }
}