https://developers-dot-devsite-v2-prod.appspot.com/ad-manager/mobile-ads-sdk/android/reference/kotlin/com/google/android/gms/ads/mediation/InitializationCompleteCallback
InitializationCompleteCallback | Mobile Ads SDK for Android | Google for Developers
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https://developers.google.cn/ad-manager/mobile-ads-sdk/android/reference/kotlin/com/google/android/gms/ads/mediation/InitializationCompleteCallback
InitializationCompleteCallback | Mobile Ads SDK for Android | Google for Developers
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