def METHOD_NAME():
    """
    Returns a list of transactional message IDs that basket clients send.
    """
    data = cache.get(TRANSACTIONAL_CACHE_KEY)
    if data is None:
        data = [tx.message_id for tx in AcousticTxEmailMessage.objects.filter(private=False)]
        cache.set(TRANSACTIONAL_CACHE_KEY, data)
    return data