curl --location --request POST 'https://slack.com/api/chat.update' \
--header 'token;' \
--data-urlencode 'channel=' \
--data-urlencode 'ts='{
    "channel": "C024BE91L",
    "message": {
        "text": "Updated text you carefully authored",
        "user": "U34567890"
    },
    "ok": true,
    "text": "Updated text you carefully authored",
    "ts": "1401383885.000061"
}