text: from requests.auth import HTTPBasicAuth
  from ..utils import handle_http_errors
  from .oauth import BaseOAuth2
  
  
  class JustGivingOAuth2(BaseOAuth2):
      """Just Giving OAuth authentication backend"""
      name = 'justgiving'
      ID_KEY = 'userId'
      AUTHORIZATION_URL = 'https://identity.justgiving.com/connect/authorize'
      ACCESS_TOKEN_URL = 'https://identity.justgiving.com/connect/token'
      ACCESS_TOKEN_METHOD = 'POST'
      USER_DATA_URL = 'https://api.justgiving.com/v1/account'
      DEFAULT_SCOPE = ['openid', 'account', 'profile', 'email', 'fundraise']
  
      def get_user_details(self, response):
          """Return user details from Just Giving account"""
          fullname, first_name, last_name = self.get_user_names(
              '',
              response.get('firstName'),
              response.get('lastName'))
          return {
              'username': response.get('email'),
              'email': response.get('email'),
              'fullname': fullname,
              'first_name': first_name,
              'last_name': last_name
          }
  
      def user_data(self, access_token, *args, **kwargs):
          """Loads user data from service"""
          key, secret = self.get_key_and_secret()
          return self.get_json(self.USER_DATA_URL, headers={
              'Authorization': 'Bearer {0}'.format(access_token),
              'Content-Type': 'application/json',
              'x-application-key': secret,
              'x-api-key': key
          })
  
      @handle_http_errors
      def auth_complete(self, *args, **kwargs):
          """Completes login process, must return user instance"""
          state = self.validate_state()
          self.process_error(self.data)
  
          key, secret = self.get_key_and_secret()
          response = self.request_access_token(
              self.access_token_url(),
              data=self.auth_complete_params(state),
              headers=self.auth_headers(),
              auth=HTTPBasicAuth(key, secret),
              method=self.ACCESS_TOKEN_METHOD
          )
          self.process_error(response)
          return self.do_auth(response['access_token'], response=response,
                              *args, **kwargs)
  