> ## Documentation Index
> Fetch the complete documentation index at: https://docs.mercurjs.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Event reference

> Events emitted by the Attribute domain, for subscribers and side effects.

The Attribute domain emits events as attributes and their values change.
Subscribe to them to run side effects, such as reindexing storefront filters,
syncing an external PIM, or kicking off follow-up workflows, instead of polling.

```ts title="src/subscribers/attribute-created.ts" theme={null}
import type { SubscriberArgs, SubscriberConfig } from "@medusajs/framework"

export default async function attributeCreatedHandler({
  event,
  container,
}: SubscriberArgs<{ id: string }>) {
  const attributeId = event.data.id
  // ...reindex filters, sync to an external system, etc.
}

export const config: SubscriberConfig = {
  event: "product-attribute.created",
}
```

## Attribute events

| Event                       | Emitted when            | Payload  |
| --------------------------- | ----------------------- | -------- |
| `product-attribute.created` | An attribute is created | `{ id }` |
| `product-attribute.updated` | An attribute changes    | `{ id }` |
| `product-attribute.deleted` | An attribute is deleted | `{ id }` |

## Value events

| Event                             | Emitted when       | Payload  |
| --------------------------------- | ------------------ | -------- |
| `product-attribute-value.created` | A value is created | `{ id }` |
| `product-attribute-value.updated` | A value changes    | `{ id }` |
| `product-attribute-value.deleted` | A value is deleted | `{ id }` |