Request URL:
POST https://example.com/oauth/token
Request Headers:
  Content-Type: application/x-www-form-urlencoded
Request POST Body:
grant_type=password&username=joebloggs&
   password=password1234&client_id=myclient&client_secret=myclientsecret
Response:
{
  "access_token": "omitted for brevity",
  "token_type": "bearer",
  "expires_in": 1200,
  "refresh_token": "b3cc9c66b86340c5b743f2a7cec9d2f1"
}