We want Zoom integration without being on the marketplace? Is that still possible?

We have an app built for our clients. We have integrated Zoom so that they can partake in Zoom meetings from within our app. However, now without a ‘published’ app they can no longer use their own Zoom meetings IDs and it only works with our main account.
I understand that in order to get away from this limitation an app now has to go through the entire review process? Does it HAVE to be on the zoom marketplace? Or can we get approval to use our app without having to bbe on the marketplace as it is now?