def METHOD_NAME(self, notification_text, blocks, thread_ts=None):
    data = {
        "channel": self.channel,
        "text": notification_text,
        "blocks": blocks
    }
    if thread_ts:
        data["thread_ts"] = thread_ts
    response = self._post("https://slack.com/api/chat.postMessage", data)
    return response.json()