Because I like being able to see all the flags being submitted :)

ctfd_submission_monitor.py

import os
import time
import requests

API_URL = os.environ.get("API_URL", "https://ctf.heroctf.fr/api/v1").rstrip("/")
CTFD_TOKEN = os.environ.get(
    "CTFD_TOKEN",
    "ctfd_TOKEN_GOES_HERE",
)


def ok(s):
    return "\033[92m {}\033[00m".format(s)


def ko(s):
    return "\033[91m {}\033[00m".format(s)


r = requests.get(
    f"{API_URL}/submissions",
    headers={
        "Authorization": f"Token {CTFD_TOKEN}",
        "Content-Type": "application/json",
    },
).json()

latest_submission = r["meta"]["pagination"]["total"]

while True:
    r = requests.get(
        f"{API_URL}/submissions/{latest_submission}",
        headers={
            "Authorization": f"Token {CTFD_TOKEN}",
            "Content-Type": "application/json",
        },
    ).json()

    if "message" in r:
        time.sleep(3)
        continue
    else:
        latest_submission += 1
    # flag submitted, right or wrong
    flag = r["data"]["provided"]

    # if the flag's correct or not
    corr = r["data"]["type"]

    team = r["data"]["team"]["name"]
    user = r["data"]["user"]["name"]

    chall = r["data"]["challenge"]["name"]

    out = f"{latest_submission-1} at {int(time.time())}: {flag!r} by {user!r} ({team!r}) in {chall!r}"

    print(ok(out) if corr == "correct" else ko(out))