Zoom Meeting and Webinar integration in a website

We've integrated the Zoom Web SDK into our ReactJS application. For generating JWT tokens to join meetings, we've utilized the Meeting SDK app, using its client ID and client secret keys. This setup allows us to join meetings successfully without needing to publish the app.

However, given the current situation, we're required to publish the app in the marketplace, which involves submission review. Since we don't have external integrations like Connect App, we're unsure if app review submission is mandatory for us.

Secondly, we're curious about how we can utilize a server-to-server authentication app for joining meetings and webinars using a signature.