Webhook
Automatic HTTP notification between systems.
Webhook is an automatic HTTP notification between systems, fired the moment an event happens. Instead of polling, the source pushes when there's news.
How webhooks work on WhatsApp
In Zapext, whenever something happens inside WhatsApp Web — new contact, tag applied, closed chat, Kanban move — the extension fires a POST to a configured URL.
Outbound only
Zapext sends outbound webhooks only — events leave Zapext to external systems. For inbound (external systems creating WhatsApp messages), use the WhatsApp Business API.
See: integrations.