Unity Ads & Rewarded Video Monetization: Setup, eCPM Optimization & Waterfall Guide (2026)

using UnityEngine;
using UnityEngine.Advertisements;

public class UnityAdsManager : MonoBehaviour, IUnityAdsInitializationListener, IUnityAdsLoadListener, IUnityAdsShowListener
{
    [Header("Store Game IDs")]
    [SerializeField] private string androidGameId = "1234567";
    [SerializeField] private string iOSGameId = "7654321";
    [SerializeField] private bool testMode = true;

    [Header("Ad Unit IDs")]
    [SerializeField] private string androidRewardedAdUnitId = "Rewarded_Android";
    [SerializeField] private string iOSRewardedAdUnitId = "Rewarded_iOS";

    private string gameId;
    private string rewardedAdUnitId;

    private void Awake()
    {
        InitializeAds();
    }

    public void InitializeAds()
    {
#if UNITY_IOS
        gameId = iOSGameId;
        rewardedAdUnitId = iOSRewardedAdUnitId;
#elif UNITY_ANDROID
        gameId = androidGameId;
        rewardedAdUnitId = androidRewardedAdUnitId;
#else
        gameId = androidGameId;
        rewardedAdUnitId = androidRewardedAdUnitId;
#endif

        if (!Advertisement.isInitialized && Advertisement.isSupported)
        {
            Debug.Log($"[Unity Ads] Initializing SDK for Game ID: {gameId}");
            Advertisement.Initialize(gameId, testMode, this);
        }
    }

    // =========================================================================
    // INITIALIZATION CALLBACKS
    // =========================================================================
    public void OnInitializationComplete()
    {
        Debug.Log("[Unity Ads] Initialization Complete. Preloading Rewarded Ad...");
        LoadRewardedAd();
    }

    public void OnInitializationFailed(UnityAdsInitializationError error, string message)
    {
        Debug.LogError($"[Unity Ads Error] Initialization Failed: {error} - {message}");
    }

    // =========================================================================
    // LOADING ADS
    // =========================================================================
    public void LoadRewardedAd()
    {
        Debug.Log($"[Unity Ads] Loading Rewarded Ad Unit: {rewardedAdUnitId}");
        Advertisement.Load(rewardedAdUnitId, this);
    }

    public void OnUnityAdsAdLoaded(string placementId)
    {
        Debug.Log($"[Unity Ads] Ad Successfully Loaded for Placement: {placementId}");
    }

    public void OnUnityAdsFailedToLoad(string placementId, UnityAdsLoadError error, string message)
    {
        Debug.LogError($"[Unity Ads Error] Failed to Load Ad '{placementId}': {error} - {message}");
    }

    // =========================================================================
    // SHOWING REWARDED ADS
    // =========================================================================
    public void ShowRewardedAd()
    {
        Debug.Log($"[Unity Ads] Showing Rewarded Ad Placement: {rewardedAdUnitId}");
        Advertisement.Show(rewardedAdUnitId, this);
    }

    public void OnUnityAdsShowComplete(string placementId, UnityAdsShowCompletionState showCompletionState)
    {
        if (placementId.Equals(rewardedAdUnitId) && showCompletionState == UnityAdsShowCompletionState.COMPLETED)
        {
            Debug.Log("[Unity Ads Success] Player completed rewarded video. Granting reward!");
            GrantPlayerReward();

            // Preload next rewarded ad immediately
            LoadRewardedAd();
        }
    }

    public void OnUnityAdsShowFailure(string placementId, UnityAdsShowError error, string message)
    {
        Debug.LogError($"[Unity Ads Error] Show Failed for '{placementId}': {error} - {message}");
    }

    public void OnUnityAdsShowStart(string placementId) { }
    public void OnUnityAdsShowClick(string placementId) { }

    private void GrantPlayerReward()
    {
        // Example Reward Logic
        PlayerPrefs.SetInt("UserCoins", PlayerPrefs.GetInt("UserCoins", 0) + 50);
        Debug.Log("[Rewards] Granted 50 Coins to player.");
    }
}