ChatMessageCreate

Append a message to chat history.

Example — inbound WhatsApp message:

{
  "contact_id": "+31612345678",
  "channel": "whatsapp",
  "role": "user",
  "content": "When does my order arrive?",
  "agent_id": "744b5e63-3148-4c1d-819b-89457516cba3",
  "metadata": { "provider_message_id": "wamid.ABC" }
}

Example — assistant reply:

{
  "contact_id": "+31612345678",
  "channel": "whatsapp",
  "role": "assistant",
  "content": "Your order ships tomorrow."
}

{
    "contact_id": "string",
    "channel": "string",
    "role": "user",
    "content": "string",
    "agent_id": "2b1e3b65-2c04-4fa2-a2d7-467901e98978",
    "metadata": {}
}