How to Build a Idempotent Webhook Endpoint for Marketplace Cleanup Queues

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A reliable marketplace cleanup webhook in Node.js or Go should verify the HMAC signature against raw request bytes before parsing the payload, ensuring authentication precedes deserialization. The handler must then persist a unique claim in a shared transactional store using a delivery ID or business key, preventing duplicate cleanup commands from concurrent endpoint instances. Only after a successful durable write should the endpoint return a success acknowledgement to the queue; if the database is unavailable, a non-success response should be returned to allow redelivery. A bounded background worker, not the HTTP handler itself, should own retries and the actual cleanup of stale search and reservation data. This design tolerates late cleanup runs while guarding against irreversible side effects such as double-deleting listings or double-charging sellers.

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