WhatsApp webhooks explained: delivery, ordering and duplicates

WhatsApp Business Platform integrations rely on webhooks for inbound messages, delivery and template statuses, and account notifications, but must be designed for at-least-once delivery, out-of-order events, and occasional subscription failures. Secure implementations verify each request’s signature against its raw payload, deduplicate events by message ID, persist and queue valid payloads before quickly acknowledging them, and process slower tasks asynchronously to avoid retries and duplicate responses. Applications should use event timestamps and tolerant state transitions rather than arrival order, interpret message statuses carefully, and avoid treating missing read receipts as meaningful. Monitoring should detect unusual periods with no inbound traffic, subscription health issues, endpoint latency, and certificate expiration, while reconciliation processes help recover missed events. Media requires separate, prompt retrieval using IDs provided in webhook payloads and creates data retention and access responsibilities. The recommended baseline handler is verify, deduplicate, queue, and acknowledge, supported by replay testing for idempotency and subscriptions limited to event types the application actually handles.

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