curl --request PATCH \
  --url https://api.attio.com/v2/tasks/{task_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "deadline_at": "2023-01-01T15:00:00.000000000Z",
    "is_completed": false,
    "linked_records": [
      "person@company.com",
      "fundstack.com"
    ],
    "assignees": [
      {
        "referenced_actor_type": "workspace-member",
        "referenced_actor_id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
      }
    ]
  }
}
'

import requests

url = "https://api.attio.com/v2/tasks/{task_id}"

payload = { "data": {
        "deadline_at": "2023-01-01T15:00:00.000000000Z",
        "is_completed": False,
        "linked_records": ["person@company.com", "fundstack.com"],
        "assignees": [
            {
                "referenced_actor_type": "workspace-member",
                "referenced_actor_id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
            }
        ]
    } }
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: {
      deadline_at: '2023-01-01T15:00:00.000000000Z',
      is_completed: false,
      linked_records: ['person@company.com', 'fundstack.com'],
      assignees: [
        {
          referenced_actor_type: 'workspace-member',
          referenced_actor_id: '50cf242c-7fa3-4cad-87d0-75b1af71c57b'
        }
      ]
    }
  })
};

fetch('https://api.attio.com/v2/tasks/{task_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/tasks/{task_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' => [
        'deadline_at' => '2023-01-01T15:00:00.000000000Z',
        'is_completed' => false,
        'linked_records' => [
                'person@company.com',
                'fundstack.com'
        ],
        'assignees' => [
                [
                                'referenced_actor_type' => 'workspace-member',
                                'referenced_actor_id' => '50cf242c-7fa3-4cad-87d0-75b1af71c57b'
                ]
        ]
    ]
  ]),
  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/tasks/{task_id}"

	payload := strings.NewReader("{\n  \"data\": {\n    \"deadline_at\": \"2023-01-01T15:00:00.000000000Z\",\n    \"is_completed\": false,\n    \"linked_records\": [\n      \"person@company.com\",\n      \"fundstack.com\"\n    ],\n    \"assignees\": [\n      {\n        \"referenced_actor_type\": \"workspace-member\",\n        \"referenced_actor_id\": \"50cf242c-7fa3-4cad-87d0-75b1af71c57b\"\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/tasks/{task_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"deadline_at\": \"2023-01-01T15:00:00.000000000Z\",\n    \"is_completed\": false,\n    \"linked_records\": [\n      \"person@company.com\",\n      \"fundstack.com\"\n    ],\n    \"assignees\": [\n      {\n        \"referenced_actor_type\": \"workspace-member\",\n        \"referenced_actor_id\": \"50cf242c-7fa3-4cad-87d0-75b1af71c57b\"\n      }\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.attio.com/v2/tasks/{task_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    \"deadline_at\": \"2023-01-01T15:00:00.000000000Z\",\n    \"is_completed\": false,\n    \"linked_records\": [\n      \"person@company.com\",\n      \"fundstack.com\"\n    ],\n    \"assignees\": [\n      {\n        \"referenced_actor_type\": \"workspace-member\",\n        \"referenced_actor_id\": \"50cf242c-7fa3-4cad-87d0-75b1af71c57b\"\n      }\n    ]\n  }\n}"

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

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "task_id": "649e34f4-c39a-4f4d-99ef-48a36bef8f04"
    },
    "content_plaintext": "Follow up on current software solutions",
    "deadline_at": "2023-01-01",
    "is_completed": false,
    "completed_at": "2022-11-21T13:22:49.061281000Z",
    "linked_records": [
      {
        "target_object_id": "people",
        "target_record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d"
      }
    ],
    "assignees": [
      {
        "referenced_actor_type": "workspace-member",
        "referenced_actor_id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
      }
    ],
    "created_by_actor": {
      "type": "workspace-member",
      "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
    },
    "created_at": "2022-11-21T13:22:49.061281000Z"
  }
}

{
  "status_code": 400,
  "type": "invalid_request_error",
  "code": "validation_type",
  "message": "Only standard or custom object records can be linked to."
}

{
  "status_code": 404,
  "type": "invalid_request_error",
  "code": "not_found",
  "message": "Object with slug/ID \"649e34f4-c39a-4f4d-99ef-48a36bef8f04\" not found."
}