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

# Webhook Signatures and Idempotency

> Verify signatures and prevent duplicate processing in webhook receivers

# Webhook Signatures and Idempotency

Linquid outbound deliveries include standard webhook signing headers.

## Receiver requirements

1. Verify signature before processing payload.
2. Enforce timestamp freshness window.
3. Deduplicate on event/delivery ID.
4. Return deterministic status codes.

## Delivery semantics

* retries can occur on network or destination failures
* duplicate deliveries must be safe
* processing should be atomic and replay-safe

## Related

* `/api-reference/webhooks/overview`
* `/api-reference/webhooks/deliveries-testing-and-automation`