Triggers a webhook-based automation for a specific contact.

Use Case: Use this endpoint to trigger WhatsApp automations from external systems such as:

• E-commerce platforms (order confirmations, shipping updates, abandoned cart reminders)
• CRMs (lead follow-ups, appointment reminders)
• Marketing automation tools (triggered campaigns based on user behavior)
• Custom integrations with your own systems

Technical Details:

• The webhook ID is generated when you create a "Webhook" trigger in your Wax automation
• If the contact does not exist, it will be created automatically
• Pass run-specific values in data — they become {{data.*}} variables in your automation flow (e.g. {{data.order_id}}) and are NOT written back to the contact
• Use attributes only for values you want to permanently save on the contact, as it overwrites existing contact/CRM data
• The automation must be active for the webhook to trigger; otherwise, a 422 error is returned
• Requests without a phone_number are acknowledged with a 200 status and skipped, so senders do not record delivery failures for contacts missing a phone number