---
title: 21.5 Idempotency
description: Send the same externalEventId for the same logical event. Application stores events exactly once per externalInstanceId + externalEventId combination.…
url: "https://peikly.com/docs/integrations-idempotency/"
updated: "2026-10-10"
category: External Integrations
tags:
  - Manual sync
---

# 21.5 Idempotency

Send the same `externalEventId` for the same logical event. Application stores events exactly once per `externalInstanceId` + `externalEventId` combination. Duplicates are acknowledged but not re-processed.