Simple Postman - Firebase Collection -- 2

We need to have a sample Postman collection that shows how to consume the functions in Firebase/FireCloud. This means above all achieving proper authentication for BACKEND (server to server requests, non OAUTH). The purpose is to retrieve all documents, collections & data from child nodes given a project/database. The scope is: 1) Manage authentication (with a server key and/or custom account) 2) request a list of collections/databases in given firebase/firestore project 3) retrieve a specific document from a specific path based on list (2). WE WILL PRIVILEGE IF INSTEAD OF POSTMAN YOU CAN DELIVER A COLDFUSION (CFC FILE). Also this service can be built as a custom function if needed. We expect a postman collection and a step by step guide on creating account, authenticating and calling rest endpoints. this will all be run using CURL from Backend (no SDK).