Project Overview I have an Android gaming application called TaskTrophy which is live on the Play Store. The app is a WebView-based application where the game logic (Ludo, Sudoku, Quizzes, etc.) is hosted on a remote server (Hostinger) using PHP and JavaScript. I have implemented AdMob Mediation with Meta Audience Network and Unity Ads, but I am facing critical issues: Low Fill Rate: Only 1 or 2 ads show out of 10 requests. Mediation Errors: AdMob Inspector shows "No secure signal found" for Meta and "Bidder returned client error" for Unity. Bridge Issue: I need a reliable way to trigger Reward Ads from my hosted JavaScript/PHP game logic when a user finishes a game trial. Technical Stack Backend: PHP (Hosted on Hostinger) Frontend: JavaScript / HTML5 Games Android: Native Wrapper (WebView), .aab format Ad Stack: AdMob Primary + Meta & Unity Mediation (Bidding) Required Tasks Fix SDK Integration: Ensure Meta and Unity SDKs are correctly initialized in the Android native code so they send a "secure signal" to AdMob. Update Adapters: Verify and update the mediation adapters and dependencies in build.gradle. Optimize WebView Bridge: Refine the JavascriptInterface to ensure that when a game ends in the WebView, the Reward Ad is called instantly. Implement Ad Caching: Set up logic to pre-load ads so they are ready to show as soon as the game trial finishes. Testing: Debug using AdMob Ad Inspector to ensure all bidders (Meta/Unity) are successfully competing in the auction.