firebase-app-check

# Firebase App Check Skill This skill defines how to correctly implement Firebase App Check in Flutter applications, covering provider selection, debug configuration, enforcement rollout, and security hardening. ## When to Use Use this skill when: * Setting up and activating Firebase App Check in a Flutter project. * Selecting the right attestation provider for each platform. * Configuring debug providers for development, testing, and CI. * Enabling enforcement and monitoring App Check metrics. * Implementing token refresh handling and custom TTL configuration. --- ## 1. Setup and Configuration ``` flutter pub add firebase_app_check ``` ```dart import 'package:firebase_app_check/firebase_app_check.dart'; ``` Initialize App Check **after** `Firebase.initializeApp()` and **before** using any Firebase services: ```dart await Firebase.initializeApp(); await FirebaseAppCheck.instance.activate( webProvider: ReCaptchaV3Provider('recaptcha-v3-site-key'), androidProvider: AndroidProvider.playIntegrity, appleProvider: AppleProvider.deviceCheck, ); ``` ### Setup Checklist 1. Register apps in the Firebase console under **Project Settings > App Check**. 2. For web, obtain a reCAPTCHA v3 site key from the Firebase console. 3. Confirm activation completes before any Firestore, Storage, or RTDB calls. 4. Consider setting a custom **TTL** — shorter TTLs are more secure but consume quota faster. ### Native `FirebaseApp.configure()` on Apple Platforms Avoid calling `Firebase...