Yes, get your chat id using this API

https://developers.ringcentral.com/api-reference/Chats/listGlipChats

Then use the chat id to make a post using this API

https://developers.ringcentral.com/api-reference/Posts/createGlipPost

Thank you very much for your response.

I have a question about this, @Phong Vu. What is the API call that I use to create a chat with someone when the conversation is not found with listGlipChats? I need an id for createGlipPost and don't see how to create a new one. Thanks.

Update: Is it Create/Open Conversation? I was looking in the chats and posts sections and nothing popped out at me.