Event sub - aws verification issue

Alright, thanks for the time. Live debug learning here.

This is the info:

INFO	{
  'Accept-Encoding': 'gzip',
  'Content-Type': 'application/json',
  Host: 'isctval6s1.execute-api.eu-central-1.amazonaws.com',
  'Twitch-Eventsub-Message-Id': '4eb45489-93c7-483a-9738-b8afa7451073',
  'Twitch-Eventsub-Message-Retry': '3',
  'Twitch-Eventsub-Message-Signature': 'sha256=ba79c57c6fe9c63bf71db252d10263c0bc9b781d7bbd87c1ef90e60551160621',
  'Twitch-Eventsub-Message-Timestamp': '2021-08-25T13:37:04.621313954Z',
  'Twitch-Eventsub-Message-Type': 'webhook_callback_verification',
  'Twitch-Eventsub-Subscription-Is-Batching-Enabled': 'false',
  'Twitch-Eventsub-Subscription-Type': 'channel.follow',
  'Twitch-Eventsub-Subscription-Version': '1',
  'User-Agent': 'Go-http-client/1.1',
  'X-Amzn-Trace-Id': 'Root=1-612647ca-7b45789b793bddef2d12d4e7',
  'X-Forwarded-For': '52.12.79.235',
  'X-Forwarded-Port': '443',
  'X-Forwarded-Proto': 'https'
} 
{
    "subscription": {
        "id": "6e6826a3-5070-40e0-8188-a4e159076086",
        "status": "webhook_callback_verification_pending",
        "type": "channel.follow",
        "version": "1",
        "condition": {
            "broadcaster_user_id": "32168215"
        },
        "transport": {
            "method": "webhook",
            "callback": "https://isctval6s1.execute-api.eu-central-1.amazonaws.com/Dev/notifications"
        },
        "created_at": "2021-08-25T13:37:04.616793612Z",
        "cost": 1
    },
    "challenge": "xf4gMJw-IyZQAr2oa_4_S-PKDlDdSjHPqnbajAAnwFs"
}