There is a field Endpoint URL. Is it mandatory? Can an application be published without having it?
Yes, the Deauthorization Endpoint URL is Mandatory for all published apps. The purpose of this URL is to notify Zoom upon deletion of user data when a user uninstalls your application.
If you would like to learn more, here is an excellent resource that breaks down the purpose of the Deauthorization Endpoint URL and has an example of what the Deauthorization Notification looks like: