Message authentication from Postman

Hello,

Can anyone please share Postman config for authenticating end users in messaging? I have created a JWT token and trying to test if the end user authentication for messaging works from the postman. JWT token seems to be valid when I tried it in jwt.io. I'm not sure if the end point I'm using in the postman is correct for authenticating end users in messaging. I'm receiving an Invalid token error message. Please guide me. I really appreciate your help with this.