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Create a conversation

Open a new customer conversation in Letterbook from an external system.

Last updated June 3, 2026

What this guide covers

Create a conversation when a support request starts outside a connected inbox, such as an app form, web form, or internal system.

Endpoint

POST /api/webhooks/conversations

Request fields

  • customer_email
  • customer_name
  • subject
  • message
  • message_html
  • priority
  • external_id

Response fields

  • id
  • display_id
  • status
  • url