> ## Documentation Index > Fetch the complete documentation index at: https://docs.opigno.com/llms.txt > Use this file to discover all available pages before exploring further. # Webhook Subscriptions API The Opigno Enterprise API allows external systems to receive notifications about internal events occurring within the platform. By registering a webhook subscription, a client application specifies: * Which event trigger it is interested in (e.g. `USER_COMPLETED_TRAINING`, `USER_REGISTERED_TO_LIVE_SESSION`) * Which endpoint URL should receive the event payload when the event is triggered When a matching event occurs, the system automatically performs an HTTP request to the configured endpoint, delivering event-related data in a JSON format. Webhook subscriptions can be managed via API and support a set of CRUD operations: * Create a webhook subscription * List webhook subscriptions (optionally filtered by event type) * Delete an existing webhook subscription Webhook subscriptions may optionally include a signature value. When provided, this secret is used for each outbound webhook request and included as a dedicated HTTP header: ``` X-Opigno-LIP-Signature: ```