Lead Forms API

Submit a Line lead form from your own front end.

Line validates answers, saves the response and Inbox entry atomically, and queues notifications and existing Web Chat workflow side effects. Success means the response is stored. Processing can finish later. The equivalent hosted endpoint is /api/public/forms/{publicKey}/{slug}/submit.

The endpoint is unauthenticated — the form's public key and slug are the address. Abuse is held back by per-IP rate limits and, when the tenant has configured it, a Cloudflare Turnstile check.