Event Identity & Deduplication Headers

At capture time, each event is assigned a v4 UUID (event.id) and a UTC timestamp (event.timestamp). These are embedded in the payload under the event key and sent as X-Event-Id and X-Event-Timestamp headers on every delivery attempt — including retries. X-Webhook-Id carries the webhook's own stable UUID to identify the source configuration.

Payload structure

The default payload shape includes: event.id (UUID), event.timestamp (ISO 8601 UTC), event.version (plugin schema version), hook (trigger name), args (raw WordPress hook arguments), timestamp (Unix epoch), and site (site URL and name).

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