AdMobを実装したアプリを初リリースするときの注意点！テスト広告→本番広告

using UnityEngine;
using GoogleMobileAds.Api;
using Unity.Services.Authentication;
using Unity.Services.Core;
using Unity.Services.RemoteConfig;
public class AdmobManager : MonoBehaviour
{
    public static AdmobManager Instance
    {
        get
        {
            if (instance == null)
            {
                instance = FindObjectOfType<AdmobManager>();
            }
            return instance;
        }
    }
    public static AdmobManager instance;

    private bool isReady = false;
    public bool IsReady
    {
        get
        {
            return isReady;
        }
    }
    [SerializeField] private bool useRemoteConfig = false;

    async void Start()
    {
        if (this != Instance)
        {
            Destroy(gameObject);
            return;
        }
        else
        {
            DontDestroyOnLoad(gameObject);
            instance = this;
        }

        if (useRemoteConfig)
        {
            if (Utilities.CheckForInternetConnection())
            {
                await UnityServices.InitializeAsync();

                if (!AuthenticationService.Instance.IsSignedIn)
                {
                    await AuthenticationService.Instance.SignInAnonymouslyAsync();
                }
            }
            await RemoteConfigService.Instance.FetchConfigsAsync(new userAttributes(), new appAttributes());
        }

        MobileAds.RaiseAdEventsOnUnityMainThread = true;
        MobileAds.Initialize(initStatus =>
        {
            isReady = true;
            Debug.Log(initStatus);
        });
    }
}

using System.Collections;
using UnityEngine;
using GoogleMobileAds.Common;
using Unity.Services.RemoteConfig;

public abstract class AdmobUnitBase : MonoBehaviour
{
    [SerializeField] private string unitIDAndroid;
    [SerializeField] private string unitIDIOS;

    protected string UnitID
    {
        get
        {
#if UNITY_ANDROID
            return unitIDAndroid;
#elif UNITY_IOS
            return unitIDIOS;
#else
            return "";
#endif
        }
    }

    [Header("Remote Config")]
    [SerializeField] private bool useRemoteConfig = false;
    public bool UseRemoteConfig => useRemoteConfig;
    [SerializeField] private string keyUnitIDAndroid = "unit_id_android";
    [SerializeField] private string keyUnitIDIOS = "unit_id_ios";

    private void OnAppStateChangedBase(AppState state)
    {
        Debug.Log("App State changed to : " + state);
        OnAppStateChanged(state);
    }

    private IEnumerator Start()
    {
        while (AdmobManager.Instance.IsReady == false)
        {
            yield return 0;
        }
        if (useRemoteConfig)
        {
            unitIDAndroid = RemoteConfigService.Instance.appConfig.GetString(keyUnitIDAndroid);
            unitIDIOS = RemoteConfigService.Instance.appConfig.GetString(keyUnitIDIOS);
        }
        Initialize();
    }
    protected virtual void Initialize()
    {
        // AdsManagerの初期化が終わったあとに呼ばれる
    }
    protected virtual void OnAppStateChanged(AppState state)
    {
    }
}