curl --request POST \
  --url https://www.dench.com/api/v1/crm/transactions/{txnId}/operations \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "op": {
    "type": "entries.update",
    "entryId": "ent_lead99",
    "data": {
      "Status": "Qualified"
    }
  }
}
'

const options = {
  method: 'POST',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    op: {type: 'entries.update', entryId: 'ent_lead99', data: {Status: 'Qualified'}}
  })
};

fetch('https://www.dench.com/api/v1/crm/transactions/{txnId}/operations', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

import requests

url = "https://www.dench.com/api/v1/crm/transactions/{txnId}/operations"

payload = { "op": {
        "type": "entries.update",
        "entryId": "ent_lead99",
        "data": { "Status": "Qualified" }
    } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

{
  "ok": true
}

{
  "error": {
    "message": "<string>",
    "type": "<string>",
    "code": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "message": "<string>",
    "type": "<string>",
    "code": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "message": "<string>",
    "type": "<string>",
    "code": "<string>",
    "details": "<unknown>"
  }
}

{
  "error": {
    "message": "<string>",
    "type": "<string>",
    "code": "<string>",
    "details": "<unknown>"
  }
}