Building a paid Zoom Chatbot

I am brand new to Zoom development and finding a severe lack of guidance within the documentation and other online sources.  In any case, I want to build a chatbot (i.e. team chat app), and charge users a small amount of money per installation, but I haven't seen any apps in the Zoom App Marketplace that seem to have a price tag on them, and I haven't seen any documentation or anything in the app setup flow that reveals where I can set a price for my Zoom app.  Are paid apps even a thing on Zoom App Marketplace?  Or are all apps supposed to be free?  How does one get paid for their Zoom apps?