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

> ## Agent Instructions
> Automate.ax automations are TypeScript programs.
> Use Bun for installation and command examples.
> Use Automate.ax for the product name and automate.ax for the package, CLI, and domain.
> Treat documented public APIs as current; do not invent transitional or deprecated names.

# On event

> Starts for any supported Meta ad-account webhook change.

`metaAds.onEvent` starts for any supported Meta ad-account webhook change.

```ts automations/meta-ads-on-event.automation.ts theme={null}
import { automation } from "automate.ax"
import { metaAds } from "automate.ax/meta-ads"

export default automation("On event", () => {
  const event = metaAds.onEvent({ adAccountId: "123456789" })
  metaAds.getAdAccount({ adAccountId: event.accountId })
})
```

Returns `{ accountId, field, occurredAt, value }`. Use `field` to distinguish provider webhook families. Optional `account` selects a static project account binding.