I’ve written before about a project in which I’m using Firebase Authentication in combination with Google Cloud Endpoints and a gRPC service running on Cloud Run: Firebase Authentication, Cloud Endpoints and gRPC (1of2) Firebase Authentication, Cloud Endpoints and gRPC (2of2) This works well with one caveat, the ID tokens (JWTs) minted by Firebase Authentication have a 3600 second (one hour) lifetime. The user flow in my app is that whenever the user invokes the app’s CLI: