RepeatableBanner

using System.Collections;
using System.Collections.Generic;
using System.Linq;

using UnityEngine;

public class RepeatableBanner : MonoBehaviour
{
    [SerializeField]
    private float _timeStep = 1f;

    [SerializeField]
    private string _adUnitId = "YOUR_adUnitId";

    [SerializeField]
    private AdSize _adSize = AdSize.BANNER_320x50;

    [SerializeField]
    private AdPosition _adPosition = AdPosition.BottomCenter;

    [SerializeField]
    private Parameter[] _parameters;

    private Banner banner;

    private void Start()
    {
        banner = new Banner(_adUnitId, _adSize, _adPosition);
        StartCoroutine(StartRepeatTimer());
    }

    private IEnumerator StartRepeatTimer()
    {
        while (true)
        {
            yield return new WaitForSeconds(_timeStep);

            RequestBanner();
        }
    }

    private void RequestBanner()
    {
        AdRequest request = new AdRequest.Builder().WithParameters(CreateAdFoxParameters()).Build();

        banner.LoadAd(request);
    }

    // Код из интерфейса ADFOX для работы с прямыми кампаниями.
    private Dictionary<string, string> CreateAdFoxParameters() =>
        _parameters.ToDictionary(parameter => parameter.Name, parameter => parameter.Value);

    [System.Serializable]
    public class Parameter
    {
        public string Name;
        public string Value;
    }
}