Cómo integrar el quiz con webhooks

{
  "id": 12345,
  "quizId": 611,
  "answers": [
    {"q": "Pregunta 1", "questionId": 10, "a": ["Opción 2"]},
    {"q": "Pregunta 2", "questionId": 11, "a": ["Opción 3"]}
  ],
  "contacts": {
    "name": "Carlos",
    "phone": "79991234567",
    "email": "example@gmail.com",
    "address": "Ciudad de México, Av. Ejemplo 1",
    "text": "Quiero una asesoría",
    "messenger": {"type": "telegram", "value": "@username"},
    "messengerName": "Carlos"
  },
  "created": "17.08.2019 22:41",
  "quizDurationSeconds": 95,
  "result": {
    "value": "15%",
    "title": "Tu descuento",
    "description": "Completa tu solicitud"
  },
  "extra": {
    "href": "https://example.com/page",
    "ref": "https://google.com",
    "utm": {"utm_source": "google"},
    "cookies": {
      "_ga": "GA1.2.477745229.1562102022",
      "_ym_uid": "1562107156134812542"
    }
  }
}

<?php
$data = json_decode(file_get_contents('php://input'), true);

$answers = $data['answers'] ?? [];
$contacts = $data['contacts'] ?? [];

$phone = $contacts['phone'] ?? null;
$email = $contacts['email'] ?? null;
$name = $contacts['name'] ?? ($contacts['messengerName'] ?? null);
$messenger = $contacts['messenger'] ?? null; // ['type' => 'telegram', 'value' => '@username']
$address = $contacts['address'] ?? null;
$comment = $contacts['text'] ?? null;

$createdDate = strtotime($data['created'] ?? 'now');
$utm = $data['extra']['utm'] ?? [];
$result = $data['result'] ?? null;
$quizDurationSeconds = $data['quizDurationSeconds'] ?? null;
$leadId = $data['id'] ?? null;
$quizId = $data['quizId'] ?? null;

// Tu lógica de procesamiento...

http_response_code(200);
exit;