loadAd method
Loads an InterstitialAd.
Returns true if the ad was loaded successfully, false otherwise.
whiteList: A list of allowed countries for ad requests.
timeout: The duration after which the ad request will time out.
country: The user's country for ad targeting.
Implementation
Future<bool> loadAd({
List<String>? whiteList,
Duration? timeout,
String? country,
}) async {
if (_loadAdFuture != null) return _loadAdFuture!;
_loadAdFuture = _loadAd(
whiteList: whiteList,
timeout: timeout,
country: country,
);
return _loadAdFuture!;
}