Hey @brunikb,
Happy to help get your app published. Checkout this thread about submitting apps in different languages:
No, to make API requests on behalf of Zoom users external to your account, you will need to publish your app to the Zoom App Marketplace. That being said, you can follow this guide here to limit who can install your app.
Please let me know if you have any additional questions, and feel free to share my response with the app reviewers. 
Thanks,
Tommy