curl --request PUT \
  --url https://api.attio.com/v2/meetings/{meeting_id} \
  --header 'Authorization: Bearer <token>' \
  --header 'Content-Type: application/json' \
  --data '
{
  "data": {
    "linked_records": [
      {
        "object": "people",
        "record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d"
      }
    ]
  }
}
'

import requests

url = "https://api.attio.com/v2/meetings/{meeting_id}"

payload = { "data": { "linked_records": [
            {
                "object": "people",
                "record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d"
            }
        ] } }
headers = {
    "Authorization": "Bearer <token>",
    "Content-Type": "application/json"
}

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

print(response.text)

const options = {
  method: 'PUT',
  headers: {Authorization: 'Bearer <token>', 'Content-Type': 'application/json'},
  body: JSON.stringify({
    data: {
      linked_records: [{object: 'people', record_id: '891dcbfc-9141-415d-9b2a-2238a6cc012d'}]
    }
  })
};

fetch('https://api.attio.com/v2/meetings/{meeting_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/meetings/{meeting_id}",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "PUT",
  CURLOPT_POSTFIELDS => json_encode([
    'data' => [
        'linked_records' => [
                [
                                'object' => 'people',
                                'record_id' => '891dcbfc-9141-415d-9b2a-2238a6cc012d'
                ]
        ]
    ]
  ]),
  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/meetings/{meeting_id}"

	payload := strings.NewReader("{\n  \"data\": {\n    \"linked_records\": [\n      {\n        \"object\": \"people\",\n        \"record_id\": \"891dcbfc-9141-415d-9b2a-2238a6cc012d\"\n      }\n    ]\n  }\n}")

	req, _ := http.NewRequest("PUT", 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.put("https://api.attio.com/v2/meetings/{meeting_id}")
  .header("Authorization", "Bearer <token>")
  .header("Content-Type", "application/json")
  .body("{\n  \"data\": {\n    \"linked_records\": [\n      {\n        \"object\": \"people\",\n        \"record_id\": \"891dcbfc-9141-415d-9b2a-2238a6cc012d\"\n      }\n    ]\n  }\n}")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.attio.com/v2/meetings/{meeting_id}")

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

request = Net::HTTP::Put.new(url)
request["Authorization"] = 'Bearer <token>'
request["Content-Type"] = 'application/json'
request.body = "{\n  \"data\": {\n    \"linked_records\": [\n      {\n        \"object\": \"people\",\n        \"record_id\": \"891dcbfc-9141-415d-9b2a-2238a6cc012d\"\n      }\n    ]\n  }\n}"

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

{
  "data": {
    "id": {
      "workspace_id": "14beef7a-99f7-4534-a87e-70b564330a4c",
      "meeting_id": "cb59ab17-ad15-460c-a126-0715617c0853"
    },
    "title": "Onboarding Session",
    "description": "Getting you up to speed with the platform and answering any questions you have.",
    "is_all_day": false,
    "start": {
      "datetime": "2027-11-27T14:00:00.000-04:00",
      "timezone": "America/New_York"
    },
    "end": {
      "datetime": "2027-11-27T15:00:00.000-04:00",
      "timezone": "America/New_York"
    },
    "participants": [
      {
        "status": "accepted",
        "is_organizer": false,
        "email_address": "person@company.com",
        "name": "Simon Mitchell"
      }
    ],
    "linked_records": [
      {
        "object_slug": "people",
        "object_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d",
        "record_id": "891dcbfc-9141-415d-9b2a-2238a6cc012d"
      }
    ],
    "created_at": "2023-01-01T15:00:00.000000000Z",
    "created_by_actor": {
      "type": "workspace-member",
      "id": "50cf242c-7fa3-4cad-87d0-75b1af71c57b"
    }
  }
}

{
  "status_code": 400,
  "type": "invalid_request_error",
  "code": "value_not_found",
  "message": "Could not find record for values passed to the linked_records field. Please ensure that all values you are trying to set have a corresponding record that already exists in Attio."
}

{
  "status_code": 404,
  "type": "invalid_request_error",
  "code": "not_found",
  "message": "Meeting with ID \"cb59ab17-ad15-460c-a126-0715617c0853\" was not found."
}