curl --request PATCH \
  --url https://api.attio.com/v2/lists/{list}/entries/{entry_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "entry_values": {
      "41252299-f8c7-4b5e-99c9-4ff8321d2f96": "Text value",
      "multiselect_attribute": [
        "Select option 1",
        "Select option 2"
      ]
    }
  }
}
'

import requests

url = "https://api.attio.com/v2/lists/{list}/entries/{entry_id}"

payload = { "data": { "entry_values": {
            "41252299-f8c7-4b5e-99c9-4ff8321d2f96": "Text value",
            "multiselect_attribute": ["Select option 1", "Select option 2"]
        } } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PATCH',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    data: {
      entry_values: {
        '41252299-f8c7-4b5e-99c9-4ff8321d2f96': 'Text value',
        multiselect_attribute: ['Select option 1', 'Select option 2']
      }
    }
  })
};

fetch('https://api.attio.com/v2/lists/{list}/entries/{entry_id}', options)
  .then(res => res.json())
  .then(res => console.log(res))
  .catch(err => console.error(err));

<?php

$curl = curl_init();

curl_setopt_array($curl, [
  CURLOPT_URL => "https://api.attio.com/v2/lists/{list}/entries/{entry_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PATCH",
  CURLOPT_POSTFIELDS => json_encode([
    'data' => [
        'entry_values' => [
                '41252299-f8c7-4b5e-99c9-4ff8321d2f96' => 'Text value',
                'multiselect_attribute' => [
                                'Select option 1',
                                'Select option 2'
                ]
        ]
    ]
  ]),
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Content-Type: application/json"
  ],
]);

$response = curl_exec($curl);
$err = curl_error($curl);

curl_close($curl);

if ($err) {
  echo "cURL Error #:" . $err;
} else {
  echo $response;
}

package main

import (
	"fmt"
	"strings"
	"net/http"
	"io"
)

func main() {

	url := "https://api.attio.com/v2/lists/{list}/entries/{entry_id}"

	payload := strings.NewReader("{\n  \"data\": {\n    \"entry_values\": {\n      \"41252299-f8c7-4b5e-99c9-4ff8321d2f96\": \"Text value\",\n      \"multiselect_attribute\": [\n        \"Select option 1\",\n        \"Select option 2\"\n      ]\n    }\n  }\n}")

	req, _ := http.NewRequest("PATCH", url, payload)

	req.Header.Add("Authorization", "Bearer <token>")
	req.Header.Add("Content-Type", "application/json")

	res, _ := http.DefaultClient.Do(req)

	defer res.Body.Close()
	body, _ := io.ReadAll(res.Body)

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.patch("https://api.attio.com/v2/lists/{list}/entries/{entry_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"entry_values\": {\n      \"41252299-f8c7-4b5e-99c9-4ff8321d2f96\": \"Text value\",\n      \"multiselect_attribute\": [\n        \"Select option 1\",\n        \"Select option 2\"\n      ]\n    }\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.attio.com/v2/lists/{list}/entries/{entry_id}")

http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Patch.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"entry_values\": {\n      \"41252299-f8c7-4b5e-99c9-4ff8321d2f96\": \"Text value\",\n      \"multiselect_attribute\": [\n        \"Select option 1\",\n        \"Select option 2\"\n      ]\n    }\n  }\n}"

response = http.request(request)
puts response.read_body

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "list_id": "33ebdbe9-e529-47c9-b894-0ba25e9c15c0",
      "entry_id": "2e6e29ea-c4e0-4f44-842d-78a891f8c156"
    },
    "parent_record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d",
    "parent_object": "people",
    "created_at": "2022-11-21T13:22:49.061281000Z",
    "entry_values": {
      "status": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "workspace-member",
            "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
          },
          "status": {
            "id": {
              "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
              "object_id": "33ebdbe9-e529-47c9-b894-0ba25e9c15c0",
              "attribute_id": "e350362f-4b55-4c0f-93f4-379ae8ff2e5b",
              "status_id": "527def35-7994-4ef7-9584-80ef8de352a8"
            },
            "title": "In Progress",
            "is_archived": false,
            "target_time_in_status": null,
            "celebration_enabled": false
          },
          "attribute_type": "status"
        }
      ],
      "created_at": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "workspace-member",
            "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
          },
          "value": "2023-01-01T15:00:00.000000000Z",
          "attribute_type": "timestamp"
        }
      ],
      "created_by": [
        {
          "active_from": "2023-01-01T15:00:00.000000000Z",
          "active_until": null,
          "created_by_actor": {
            "type": "workspace-member",
            "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
          },
          "referenced_actor_id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b",
          "referenced_actor_type": "workspace-member",
          "attribute_type": "actor-reference"
        }
      ]
    }
  }
}

{
  "status_code": 400,
  "type": "invalid_request_error",
  "code": "immutable_value",
  "message": "The parent record for a list entry cannot be updated once created."
}

{
  "status_code": 404,
  "type": "invalid_request_error",
  "code": "not_found",
  "message": "List with slug/ID \"enterprise_sales\" not found."
}