Cannot receive Access token

[Alisha Ahuja]

Hello,

I am implementing OAUth 2.0 for my app, and am having trouble exchanging my authorization code for an access token and refresh token (I will need both).

I've been able to understand and follow this guide, however once I perform the POST request to receive a token, I get the following error: 

error: access_denied

error_description: Unauthorized

Please see my request call below, I've triple checked for typos and cannot understand why my request doesn't send. Any help is appreciated!

Request Type: POST 

URL: https://auth.atlassian.com/oauth/token

Headers:

Content-Type = application/json

Params:

grant_type=authorization_code

client_id=MY_CLIENT_ID

client_secret=MY_CLIENT_SECRET

code=MY_AUTHORIZATION_CODE

redirect_uri=https://loginuat.springcm.com