How to authenticate a firebase user from server without client side auth?

Question

I have an API which uses the node admin sdk to connect and call to firebase. My clients hit my api for all the things they need. I do not want them to have to call out to fire

Answer 1

Just wanted to provide an update: an answer to this with undocumented REST API's can be found here: Firebase REST auth when creating token with node.js admin sdk

If I could I would mark this as the answer.