Out-of-Order Webhook

Overview

An out-of-order webhook is an event delivered after a newer event for the same entity, so arrival order differs from business sequence. Independent retries, parallel delivery, network paths, and provider partitions can cause an older payment or order event to arrive after a later state. Receivers should store event identity, entity identity, provider sequence or version when available, and the current local state. Processing events solely by arrival time may then move local state backward. Sequence numbers, entity versions, monotonic status rules, or authoritative state queries provide stronger ordering evidence. Some business events remain valid even when they arrive late. Timestamps alone may be insufficient because clocks differ and multiple events can share a time. They should reject illegal regressions, process commutative effects safely, and query the provider when uncertain. Replay of Out-of-Order Webhook should preserve original identifiers and timestamps so historical processing cannot masquerade as a new event. Business actions triggered by Out-of-Order Webhook should be idempotent and should verify the current object state before fulfillment or accounting updates. Monitoring for Out-of-Order Webhook should track delivery age, signature failures, duplicate rate, retry exhaustion, and unresolved business events.

For Out-of-Order Webhook, the event identifier, signature result, delivery attempt, and resulting business state should remain connected throughout processing.

A receiver should treat transport acknowledgement and successful downstream processing as separate states for Out-of-Order Webhook.

The Out-of-Order Webhook path should preserve ordering and duplicate evidence so delayed delivery cannot silently overwrite a newer state.

Recovery for Out-of-Order Webhook should combine replay controls with an authoritative status check rather than trusting delivery history alone.