Send Message / Private Note

Updated about 2 hours ago•1 min read

POST

/v1/conversations/:conversation_id/messages

Sends a reply to the customer through the active channel (Email, WhatsApp, Chat, etc.) or records a private internal note for teammates.

Parameters

Name	Type	Description
`conversation_id`required	string	Conversation UUID
`content`	string	Message text or HTML (max 50,000 chars)
`private`	boolean	True for internal private notes (not sent to customer)
`attachment_ids`	array[string]	Array of uploaded attachment UUIDs to attach

Responses

200Message created

{
  "data": {
    "id": "msg_003",
    "content": "Hello Alice! I have reviewed your invoice and refunded the difference.",
    "visibility": "global",
    "sender": {
      "id": "usr_888",
      "name": "Sarah Connor"
    },
    "created_at": "2026-09-02T13:05:00Z"
  }
}