def METHOD_NAME(client: SlackClient, name: str) -> str | None:
    msg_response = client.post(
        "/chat.scheduleMessage",
        data={
            "channel": name,
            "text": "Sentry is verifying your channel is accessible for sending you alert rule notifications",
            "post_at": int(time.time() + 500),
        },
    )
    if "channel" in msg_response:
        client.post(
            "/chat.deleteScheduledMessage",
            params=dict(
                {
                    "channel": msg_response["channel"],
                    "scheduled_message_id": msg_response["scheduled_message_id"],
                }
            ),
        )
        return msg_response["channel"]
    return None