I saw documentation for flutter firebase Appcheck
what do I need to do in release mode with an original certificate? because all it says is for website verification
await FirebaseAppCheck.instance.activate(webRecaptchaSiteKey: 'recaptcha-v3-site-key');
I am unable to understand what to add in code for making use of app check in flutter
I think that code is only for the web platform.
For android open your main project directory in the terminal and follow the steps below.
flutter> cd .\android\
flutter\android> .\gradlew signingReport
This will print all your keys. Find the applicable one that you want. Then, copy the SHA-256 into the correct place in the firebase console.
