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

# Opt-out webhook

> The event Axle sends to your webhook when a customer leaves the VPP

When a customer opts out of the Axle VPP, Axle sends the `vpp:site:opted_out` event to the webhook
URL you registered for dispatch instructions. It lists your assets on the customer's site, none of
which we'll dispatch again.

The payload, the envelope it arrives in, the `x-axle-sig` signature, how to respond and the retry
behaviour are all documented on the Webhooks page.

<Card title="Webhooks" icon="webhook" href="/workflows/webhooks#vpp%3Asite%3Aopted_out">
  The `vpp:site:opted_out` payload and the full delivery contract
</Card>


This documentation is built and hosted on [Mintlify](https://mintlify.com), a developer documentation platform.