curl --request PUT \
  --url https://api-v2.watchcollect.com/v2/agent/threads/{thread_id}/history \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "messages": [
    {}
  ]
}
'

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({messages: [{}]})
};

fetch('https://api-v2.watchcollect.com/v2/agent/threads/{thread_id}/history', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://api-v2.watchcollect.com/v2/agent/threads/{thread_id}/history"

payload = { "messages": [{}] }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

response = requests.put(url, json=payload, headers=headers)

print(response.text)

{
  "messages": [
    {}
  ],
  "headId": "<string>"
}

{
  "error": {
    "code": "invalid_payload",
    "message": "event is required",
    "request_id": "018f06e2-4f8d-7c01-8a0d-cc6fd78f7001"
  }
}

{
  "error": {
    "code": "invalid_payload",
    "message": "event is required",
    "request_id": "018f06e2-4f8d-7c01-8a0d-cc6fd78f7001"
  }
}