Zoom API Integration

Hi there, we are trying to integrate zoom API into our VB.NET-based application. There is a problem that while joining the meeting via the API URL, it requires a redirect login to the zoom login page. We require the behaviour of API such that we pass the login credentials programmatically and the API logs in programmatically and call back URL redirects the user to our domain's redirect URI. I have read on forums that this can't be done for some reason. Please explain this behaviour.