REST API Firestore authentication with ID Token

Question

I have a Firestore DB and one user. I am able to retrieve an ID Token for the user after they sign-in via a request with REST.

I am to use the ID Token with requests

Answer 1

According to the Cloud Firestore REST API guide,

After you obtain either a Firebase ID token or a Google Identity OAuth 2.0 token, pass it to the Cloud Firestore endpoints as an Authorization header set to Bearer {YOUR_TOKEN}.

So your request should include the header

'Authorization': `Bearer ${YOUR_TOKEN}`