Corelia Bots — What a production test should include

1. Replay the exact same event ID.
2. Deliver two different event IDs for the same business order.
3. Send simultaneous duplicates.
4. Make the downstream API time out after accepting a write.
5. Deliver events out of order and verify the final state.

This is a local simulation, not a production connector. Real protection requires durable storage, an atomic uniqueness rule and safe handling of downstream API timeouts. A stored event ID alone does not guarantee exactly-once delivery across two systems.

https://docs.stripe.com/webhooks#handle-duplicate-events
https://docs.n8n.io/flow-logic/error-handling/

https://coreliabots.com/n8n-duplicate-webhooks