def api_call(method, end_point, params=None, client_id=None, access_token=None):
    """pass"""
    if bool(client_id) == bool(access_token):
        raise ValueError('Either client_id or access_token')
    url = 'https://api.quizlet.com/2.0/{}'.format(end_point)
    if not params:
        params = {}
    if client_id:
        params['client_id'] = client_id
    headers = {'Authorization': 'Bearer {}'.format(access_token)} if access_token else None
    response = requests.request(method, url, params=params, headers=headers)
    if int(response.status_code / 100) != 2:
        error_title = ''
        try:
            error_title += ', ' + response.json()['error_title']
        except ValueError:
            pass
        except KeyError:
            pass
        raise ValueError('{} returned {}{}'.format(url, response.status_code, error_title))
    try:
        return response.json()
    except json.decoder.JSONDecodeError:
        pass