This is the last update about firebase 3.0 integrated with nodejs. See node js quick start here:
https://github.com/firebase/quickstart-nodejs
Steps to integrate your app besides quickstart nodejs tutorial:
- Download your json service account into your node modules directory file to call it later with require(PATH/JSON)
- The service account that you create to generate the json file and initialize firebase should have rol editor: go to your project firebase console/configuration/permissions/IAM and add it.
- To receive and send emails succesfully you should change some permissions in your google account