Chatfuel Contacts API
Bulk-create WhatsApp contacts inside a Chatfuel automation. POST a list of up to 1,000 E.164 phone numbers plus a contact_data.properties map of custom attributes applied to every contact in the request; the automation_id in the path is read from the automation's URL in the product. Authenticated with a Bearer API token generated at Settings, API. This is the only Chatfuel API with live public documentation as of 2026-08-13. No rate-limit headers are returned.