curl --request GET \
  --url https://app.thinnest.ai/api/v1/conversations/{id}/messages \
  --header 'Authorization: Bearer <token>'

const options = {method: 'GET', headers: {Authorization: 'Bearer <token>'}};

fetch('https://app.thinnest.ai/api/v1/conversations/{id}/messages', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://app.thinnest.ai/api/v1/conversations/{id}/messages"

headers = {"Authorization": "Bearer <token>"}

response = requests.get(url, headers=headers)

print(response.text)

{
  "items": [
    {
      "id": "msg_6f2a9d4c-1e8b-4c73-a5d0-3b9e7f2c8a16",
      "author": "agent",
      "parts": [
        {
          "type": "text",
          "text": "Sorry about that, Priya. I have raised a replacement for order #10432 — it ships tomorrow."
        }
      ],
      "createdAt": "2026-10-06T10:15:09.220Z"
    },
    {
      "id": "msg_0c3e7a9b-5d1f-4e82-b6a4-8f2d1c9e7b50",
      "author": "customer",
      "parts": [
        {
          "type": "text",
          "text": "The box arrived damaged"
        },
        {
          "type": "image",
          "url": "https://storage.example.com/media/conv_8d41f2a7/photo.jpg?token=eyJhbGciOi",
          "alt": ""
        }
      ],
      "createdAt": "2026-10-06T10:15:01.482Z"
    }
  ],
  "nextCursor": null
}

{
  "error": "`since` must be an ISO 8601 date and time."
}

{
  "error": "Send a valid API key as `Authorization: Bearer <key>`."
}

{
  "error": "Conversation was not found."
}

{
  "error": "Over 240 requests a minute. Slow down and retry."
}