- Firebase Auth
- Cloud Firestore
We're building an isolated Firebase and Vue 3 based web app as an add-on to the existing website. For the rest of the question, I will call the existing website O (old) and the new web application N (new). N will be implemented inside an iFrame of the O.
So N's has it's own auth system BUT it has to work on sync with the O. Basically if user is logged in on O, then he should be able to use N (N should automatically log it in)