INSTALLED_APPS = [
   ...
   oauth2_provider,
   ...
]

MIDDLEWARE = [
   ...
   'oauth2_provider.middleware.OAuth2TokenMiddleware',
   ...
]

REST_FRAMEWORK = {
        'DEFAULT_PERMISSION_CLASSES': [
            'rest_framework.permissions.IsAuthenticated',
        ],
        'DEFAULT_AUTHENTICATION_CLASSES': [
            'oauth2_provider.contrib.rest_framework.OAuth2Authentication',
        ],
        ...
    }

curl -X POST -d "grant_type=password&username=my_user&password=my_password" -u"<Client_id>:<Client_secret>" http://localhost:8000/oauth2/token/

{"access_token": "5jNKc2g2pHRM2I3Rma8X2DwDWyTYeZ",
"expires_in": 36000, "token_type":
"Bearer", "scope": "read write",
"refresh_token": "gLTWA5zHTOnPDlUB1HvRUukHVqVQ66"}