How to get access code for password flow in postman

[partha-sen]

I am trying to get access code for postman for the password flow here is my details
postURL: http://localhost:8080/oauth/token
Headers: [{"key":"Content-Type","value":"application/x-www-form-urlencoded","description":""}]
Boady: [{"key":"username","value":"habuma","description":""},{"key":"password","value":"password","description":""},{"key":"client_id","value":"myclient","description":""},{"key":"grant_type","value":"password","description":""}]

Response is :{
"timestamp": "2019-06-05T14:34:36.368+0000",
"status": 401,
"error": "Unauthorized",
"message": "Unauthorized",
"path": "/oauth/token"
}