Webhook

A representation of the webhook object

Property	Type	Description
url	string	The URL of the webhook endpoint.
secret	string	The endpoint’s secret used to generate webhook signatures.
events	array	The list of events to enable for this endpoint. Allowed values: ["meetingScheduled", "meetingCancelled", "meetingRescheduled"]
created_at	string	The ISO-8601 time at which the object was created.
uuid	string	Unique identifier (UUID v4) of the object.

The example webhook object

{
   "events":[
      "meetingRescheduled",
      "meetingCancelled",
      "meetingScheduled"
   ],
   "url":"https://example.com/webhook",
   "secret":null,
   "created_at":"2021-05-24T11:04:11+00:00",
   "uuid":"2ba9ee0b-e62a-43bd-aed0-31b26056ecdc"
}

The example request that's being made when the meeting is scheduled
Request Method: POST
Request headers:

Header	Description
webhook-signature	Harmonizely can optionally sign the webhook events it sends to your endpoints by including a signature in each event’s Webhook-Signature header. This allows you to verify that the events were sent by Harmonizely, not by a third party
user-agent	The user agent. Always set to Harmonizely.

Request payload:

{
  "data": {
    "rescheduling": null,
    "pretty_canceled_at": null,
    "pretty_scheduled_at": "Wednesday, June 23, 2021 09:30",
    "pretty_scheduled_at_in_invitee_timezone": "Wednesday, June 23, 2021 at 9:30 AM",
    "pretty_canceled_at_in_invitee_timezone": null,
    "event_type": {
      "name": "Demo Call",
      "location": null,
      "location_label": null,
      "description": null,
      "duration": 15,
      "slug": "demo-call",
      "is_secret": false,
      "confirmation_page_type": "internal",
      "confirmation_page_url": null,
      "notification_type": "email",
      "pass_details_to_redirected_page": false,
      "type": "regular",
      "position": 0
    },
    "scheduled_at": "2021-06-23T07:30:00+00:00",
    "end_date": "2021-06-23T07:45:00+00:00",
    "invitee": {
      "first_name": "Bernice",
      "email": "bernice@example.com",
      "full_name": "Bernice J. Cervantez",
      "timezone": "Europe/Warsaw",
      "phone_number": "+48123456789",
      "locale": "en"
    },
    "state": "new",
    "canceled_at": null,
    "uuid": "601f15fb-c7e8-4988-863e-78a6ac4446df",
    "notes": null,
    "details": null,
    "answers": [
      {
        "question_label": "Details",
        "value": "My extra details",
        "question_type": "textarea"
      },
      {
        "question_label": "Agree to terms?",
        "value": 1,
        "question_type": "checkbox"
      }
    ],
    "location": "https://zoom.us/j/xxxxxx",
    "cancellation": null,
    "payment": null
  },
  "event": "meetingScheduled",
  "uuid": "ccc3d816-c44d-4a38-9eb1-e1c7d05538dc"
}

Verifying signature manually
Harmonizely generates webhook signatures using a hash-based message authentication code (HMAC) with SHA-256 which is then base64 encoded.
1. Determine the expected signature
Compute an HMAC with the SHA256 hash function and encode it using base64. Use the webhook’s signing secret as the key, and use the request's payload string as the message.
Example in PHP:

$signature = base64_encode(hash_hmac('sha256', $payload, $secret, true));

2. Compare the signatures
Compare the signature in the webhook-signature header to the expected signature.