Unable to exchage authorization code for token

[manish-verma-au3]

Hi, whenever I make a post request to get token i got 'Unauthorized' as response. please Help! below is my request:-

url:- http://localhost:3000/oauth/token

request:- { "grant_type": "authorization_code", "code": "gZl67viNzaVvJgfx", "redirect_uri": "http://localhost:3000/account", "client_id": "abc123", "state": "12345" }