curl -X POST -d "grant_type=password&username=<user_name>&password=<password>" -u"<client_id>:<client_secret>" http://localhost:8000/o/token/

curl -X POST -d "grant_type=refresh_token&client_id=<your_client_id>&client_secret=<your_client_secret>&refresh_token=<your_refresh_token>" http://localhost:8000/o/token/