curl --request PUT \
  --url https://www.dench.com/api/v1/crm/objects/{objectName}/entries/{entryId}/fields/{fieldName} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "value": [
    "user_kumar",
    "user_mark"
  ]
}
'

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

fetch('https://www.dench.com/api/v1/crm/objects/{objectName}/entries/{entryId}/fields/{fieldName}', 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/objects/{objectName}/entries/{entryId}/fields/{fieldName}"

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

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

print(response.text)

{
  "entryId": "ent_lead99"
}

{
  "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>"
  }
}