LedgerBridge keeps internal invoicing and QuickBooks Online in lockstep — tolerant of duplicate events, out-of-order delivery, write conflicts and partial failures. Every event is observable, replayable and audited.
An event leaves your internal system, lands in the durable outbox, is mapped and applied to QuickBooks — exactly once.
Every write goes through a durable outbox and a single leased worker, so duplicate and out-of-order events can never double-apply.
Duplicate and replayed events collapse to a single QBO mutation, keyed by event ID — no double-billing, ever.
Last-writer-wins by default, with a flag when both sides truly diverge — surfaced field-by-field for a one-click call.
Exponential backoff on transient failures, then a replayable dead-letter queue. Nothing is silently dropped.
Every state transition — automated or human — is recorded with actor, before/after and correlation ID.