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latestOpenAPI 3.1.02026-08-135551782.1 MB
Webhook Events

Message sent event

Fired when a message is sent via the API, or from the WhatsApp Business app on Coexistence numbers.

postWebhookmessage.sent

Payload

idstring required

Stable webhook event ID

event'message.sent' required
timestampstring date-time required

UTC time at which Zernio generated this event (set once when the event payload is built, before delivery is queued). Retries and redeliveries keep the original value, so it reflects the event, not the delivery attempt.

Response

Webhook received successfully