https://developers-dot-devsite-v2-prod.appspot.com/admob/android/reference/com/google/android/gms/ads/rewarded/RewardedAdPreloader
RewardedAdPreloader | Android | Google for Developers
androidgoogledevelopers
https://developers-dot-devsite-v2-prod.appspot.com/admob/unity/reference/class/google-mobile-ads/api/rewarded-ad-preloader
GoogleMobileAds.Api.RewardedAdPreloader Class Reference | Unity | Google for Developers
class referenceapiunitygoogledevelopers