Is there any API for get extension chat message

send extension chat message API is available but there is no API for get message Is there any API for get extension chat message

No there is not why would you want to get your own Extension Chat messages? You know they were send as you get a 204 from sending them.

If you are trying to get extension chat messages for not your Extension, you’d be better suited checking or asking that extension for it’s own API to provide data instead

I want to get livestreaming chat message or comments.so how can I get livestreaming comments?

As in “regular” non extension chat messages?

Connect to the relevant chat over IRC as documented Chat & Chatbots | Twitch Developers