See SWS Enrollment search resource spec at:
    https://wiki.cac.washington.edu/x/_qjeAw
    :return: search result json data

def _enrollment_search(regid, verbose, transcriptable, changed_since_date):
    """
    See SWS Enrollment search resource spec at:
    https://wiki.cac.washington.edu/x/_qjeAw
    :return: search result json data
    """
    url = "{}{}&{}".format(enrollment_search_url_prefix,
                           regid,
                           urlencode(
                               {"verbose": verbose,
                                "transcriptable_course": transcriptable,
                                "changed_since_date": changed_since_date}))
    return get_resource(url)