Unpublished Chatbot not working in zoom chat

So I created a chatbot via my zoom account as given here https://marketplace.zoom.us/docs/guides/guides/building-a-chatbot/create-bots-on-marketplace and generated the Publishable URL which is https://zoom.us/oauth/authorize?response_type=code&client_id=SOME_CLIENT_ID&redirect_uri=SOME_REDIRECT_URK

I clicked that url in my browser and that generated the token. However after I start a meeting(without video) and in chat if i type in /testcommand1 which is the command I entered in that bot, my bot web application does not receive the message event.

What should i do to make it work(maybe switch to premium account?)?

Hi @rahulserver,

Thank you for using Zoom.

Currently, our API Integration is a premium feature. You can consider opting for a Free Trial if you want to test them.

Please let me know if you have any other questions.