---
title: "Event Identity & Deduplication Headers"
description: "Every dispatched event gets a UUID and ISO 8601 timestamp embedded in the payload and request headers."
url: "https://wpwebhooks.org/docs/event-identity/"
---

[WP Webhooks](https://wpwebhooks.org/) / [Docs](https://wpwebhooks.org/docs/) / Event Identity & Deduplication Headers

Feature since v1.1.0

# Event Identity & Deduplication Headers

Every dispatched event gets a UUID and ISO 8601 timestamp embedded in the payload and request 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).

/ Related

[fswa\_payload](https://wpwebhooks.org/docs/fswa-payload/)[Payload Mapping](https://wpwebhooks.org/docs/payload-mapping/)[Webhook Replay](https://wpwebhooks.org/docs/webhook-replay/)

/Ready

## Your next automation is  
one sentence away.

[Install Plugin→](https://wordpress.org/plugins/flowsystems-webhook-actions/) [See the Plugin →](https://wpwebhooks.org/wordpress-webhook-plugin/)

$ wp plugin install flowsystems-webhook-actions --activate

## Structured data

```json
{"@context":"https://schema.org","@type":"TechArticle","name":"Event Identity & Deduplication Headers — Feature — Webhook Actions Docs","description":"Every dispatched event gets a UUID and ISO 8601 timestamp embedded in the payload and request headers.","url":"https://wpwebhooks.org/docs/event-identity/","isPartOf":{"@type":"WebSite","name":"WP Webhooks","url":"https://wpwebhooks.org"},"about":{"@type":"SoftwareApplication","name":"Webhook Actions","applicationCategory":"WordPress Plugin"}}
```