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Applications

An application is a logical container within Hook0 that groups related event types, subscriptions, and events. Applications represent your services or products that emit webhook events.

Key Points​

  • Applications belong to an Organization
  • Each application has its own event types, subscriptions, and secrets
  • Applications provide usage quotas and consumption tracking
  • Deleting an application cancels all pending webhook deliveries

Relationship to Other Concepts​

Organization
    |
    +-- Application
            |
            +-- Event Types (categories of events)
            +-- Subscriptions (webhook endpoints)
            +-- Application Secrets (signing keys)
            +-- Events (notifications sent)

Applications act as the boundary between your services. A typical setup might have:

  • Order Service Application - Emits order.created, order.shipped events
  • User Service Application - Emits user.registered, user.updated events
  • Billing Service Application - Emits invoice.paid, subscription.renewed events

Quotas and Limits​

Each application operates within quotas defined by your organization's plan:

  • Events per day - Maximum events that can be sent daily
  • Event retention - How long events are stored for replay

When quotas are exceeded, new events are rejected until the next billing period.

Onboarding Progress​

Hook0 tracks application setup through onboarding steps:

  1. Event Type - Define at least one event type
  2. Subscription - Configure at least one webhook endpoint
  3. Event - Send your first event

Lifecycle​

When an application is deleted:

  • The application is soft-deleted (can be audited)
  • All pending webhook deliveries are cancelled
  • No new events can be sent
  • Existing subscriptions stop receiving webhooks
Irreversible Action

Deleting an application cannot be undone. All pending webhook deliveries will be cancelled immediately.

What's Next?​