Firebase App Check REST API

Use a Google account or service account with access to the relevant Firebase/Google Cloud project. For user-based access, create or use a project in the Google Cloud Console and obtain an OAuth 2.0 access token with scopes documented on the App Check REST method pages, typically https://www.googleapis.com/auth/cloud-platform or https://www.googleapis.com/auth/firebase. For server-to-server use, create a service account in the Google Cloud Console IAM page, grant it the needed IAM roles for Firebase App Check, and mint an access token via Google Application Default Credentials or service account impersonation.