実装の詳細:
これは、使わないので、null を渡します。
Android では検証を行うために、Analytics のダッシュボードにあるプロジェクト設定フォームにて Google Public API キーを設定します。
Google Public API キーは、Google Play のアプリ内課金(IAP)でレシートの検証を実装するために必要です。Google Public API キーは、Google Play Developer コンソールの「すべてのアプリ」から該当するアプリを選び、「サービスと API」の「ライセンスとアプリ内課金」にあります。これはオプション扱いですが、Android 向けにアプリを公開したり課金要素を追加する場合は、実装することを強く推奨します。
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