code: def _wait_for_token(self, ctx, wait_token_url):
          ''' Returns a token from a the wait token URL
          @param wait_token_url URL to wait for (string)
          :return DischargeToken
          '''
          resp = requests.get(wait_token_url)
          if resp.status_code != 200:
              raise InteractionError('cannot get {}'.format(wait_token_url))
          json_resp = resp.json()
          kind = json_resp.get('kind')
          if kind is None:
              raise InteractionError(
                  'cannot get kind token from {}'.format(wait_token_url))
          token_val = json_resp.get('token')
          if token_val is None:
              token_val = json_resp.get('token64')
              if token_val is None:
                  raise InteractionError(
                      'cannot get token from {}'.format(wait_token_url))
              token_val = base64.b64decode(token_val)
          return DischargeToken(kind=kind, value=token_valf _wait_for_token(self, ctx, wait_token_url):
          ''' Returns a token from a the wait token URL
          @param wait_token_url URL to wait for (string)
          :return DischargeToken
          '''
          resp = requests.get(wait_token_url)
          if resp.status_code != 200:
              raise InteractionError('cannot get {}'.format(wait_token_url))
          json_resp = resp.json()
          kind = json_resp.get('kind')
          if kind is None:
              raise InteractionError(
                  'cannot get kind token from {}'.format(wait_token_url))
          token_val = json_resp.get('token')
          if token_val is None:
              token_val = json_resp.get('token64')
              if token_val is None:
                  raise InteractionError(
                      'cannot get token from {}'.format(wait_token_url))
              token_val = base64.b64decode(token_val)
          return DischargeToken(kind=kind, value=token_val)
docs: Returns a token from a the wait token URL
          @param wait_token_url URL to wait for (string)
          :return DischargeToken