Trying to make a start on using EventSub (PHP)

API
8

HTTP 202 is the HTTP code for “accepted”

Webhooks will 202
https://dev.twitch.tv/docs/api/webhooks-reference

When you subscribe to a webhook, if the parameters are supplied you receive an immediate 202 Accepted response, with an empty body

EventSub will 200 with a JSON Blob of data about the subscription

Example

{
  "data": [
    {
      "id": "26b1c993-bfcf-44d9-b876-379dacafe75a",
      "status": "webhook_callback_verification_pending",
      "type": "users.update",
      "version": "1",
      "condition": {
        "user_id": "1234"
      },
      "created_at": "2020-11-10T20:29:44Z",
      "transport": {
        "method": "webhook",
        "callback": "https://this-is-a-callback.com"
      },
      "cost": 1
    }
  ],
  "total": 1,
  "total_cost": 1,
  "max_total_cost": 10000
}

If webhooks:

Twitch will call the callback to verify exists
Echo back the challenge
Then you wait for data to be POST’ed to the endpoint.

If eventsub

Twitch will call the callback to verify exists
Echo back the challenge
Then you wait for data to be POST’ed to the endpoint.