How to use the oauthenticator.auth0.Auth0Mixin function in oauthenticator

from tornado.auth import OAuth2Mixin
from tornado import web
from tornado.httpclient import HTTPRequest, AsyncHTTPClient

from jupyterhub.auth import LocalAuthenticator

from .oauth2 import OAuthLoginHandler, OAuthenticator

AUTH0_SUBDOMAIN = os.getenv('AUTH0_SUBDOMAIN')

class Auth0Mixin(OAuth2Mixin):
    _OAUTH_AUTHORIZE_URL = "https://%s.auth0.com/authorize" % AUTH0_SUBDOMAIN
    _OAUTH_ACCESS_TOKEN_URL = "https://%s.auth0.com/oauth/token" % AUTH0_SUBDOMAIN


class Auth0LoginHandler(OAuthLoginHandler, Auth0Mixin):
    pass


class Auth0OAuthenticator(OAuthenticator):

    login_service = "Auth0"

    login_handler = Auth0LoginHandler

    async def authenticate(self, handler, data=None):
        code = handler.get_argument("code")
        # TODO: Configure the curl_httpclient for tornado
        http_client = AsyncHTTPClient()

        params = {
            'grant_type': 'authorization_code',