Connect a react native application to Firebase

our project needs to connect with Firebase and collect data on Firestore.

the authentication part on Firebase is working but we have a chatroom that sends messages but can't collect users' messages on Firestore.
We need to have an admin dashboard to connect to our users and chat with them.
We need to connect payment and subscription with Stripe.
All users should start with a Freemium account that is let them have a 30min chat whit admins in a month. after using the Freemium account they should see a popup to redirect them to the payment page.