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

# Event notification

> This webhook is sent by the server to the client's registered URL when a subscribed event occurs.




## OpenAPI

````yaml /products/guardian/openapi.yaml webhook event_notification
openapi: 3.1.0
info:
  title: Guardian API
  version: '1.0'
  contact:
    name: Starfish GmbH & Co. KG
    email: hello@starfish.team
    url: https://hellgate.io/cpa/guardian
  license:
    name: Hellgate API Terms
    url: https://hellgate.io/terms-and-conditions
servers:
  - url: https://{cluster_id}.on-hellgate.cloud
    description: Guardian service instance
    variables:
      cluster_id:
        default: my-cluster-id
        description: |
          Guardian is a service of the Hellgate Cloud Platform.
          The unique cluster-id is used to connect to your instance.
security: []
tags:
  - name: pci
    description: Management of card payment credentials under the ruling of PCI DSS.
  - name: network
    description: Management of network tokens and cryptograms for secure transactions.
  - name: generic
    description: Management of generic tokens and their schemas for various use cases.
  - name: metadata
    description: Inquiries for card metadata based on PAN, PCI tokens, or network tokens.
  - name: apikey
    description: Management of API keys for service access.
  - name: webhook
    description: Management of webhooks for event notifications.
  - name: types
    description: Management of types for generic token schemas.
paths: {}

````