# Delivery guarantees

### Delivery guarantees
Because a failed request is re-sent to the fallback URL, the same event can be delivered more than once — for example when the primary endpoint received and processed the request but responded too slowly. Webhook handlers should be idempotent and deduplicate on the `ce-id` and `ce-source` header pair.

Version: 2.0.58
Security: BasicAuth, SinchOAuth2

## Description:

  - `Delivery guarantees` ()
    Because a failed request is re-sent to the fallback URL, the same event can be delivered more than once — for example when the primary endpoint received and processed the request but responded too slowly. Webhook handlers should be idempotent and deduplicate on the ce-id and ce-source header pair.