Create thread

const fetch = require("node-fetch");

fetch("https://api.canva.com/rest/v1/designs/{designId}/comments", {
  method: "POST",
  headers: {
    "Authorization": "Bearer {token}",
    "Content-Type": "application/json",
  },
  body: JSON.stringify({
    "message_plaintext": "Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!",
    "assignee_id": "oUnPjZ2k2yuhftbWF7873o"
  }),
})
  .then(async (response) => {
    const data = await response.json();
    console.log(data);
  })
  .catch(err => console.error(err));

import java.io.IOException;
import java.net.URI;
import java.net.http.*;

public class ApiExample {
    public static void main(String[] args) throws IOException, InterruptedException {
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://api.canva.com/rest/v1/designs/{designId}/comments"))
            .header("Authorization", "Bearer {token}")
            .header("Content-Type", "application/json")
            .method("POST", HttpRequest.BodyPublishers.ofString("{\"message_plaintext\": \"Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!\", \"assignee_id\": \"oUnPjZ2k2yuhftbWF7873o\"}"))
            .build();

        HttpResponse<String> response = HttpClient.newHttpClient().send(
            request,
            HttpResponse.BodyHandlers.ofString()
        );
        System.out.println(response.body());
    }
}

import requests

headers = {
    "Authorization": "Bearer {token}",
    "Content-Type": "application/json"
}

data = {
    "message_plaintext": "Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!",
    "assignee_id": "oUnPjZ2k2yuhftbWF7873o"
}

response = requests.post("https://api.canva.com/rest/v1/designs/{designId}/comments",
    headers=headers,
    json=data
)
print(response.json())

using System.Net.Http;

var client = new HttpClient();
var request = new HttpRequestMessage
{
  Method = HttpMethod.Post,
  RequestUri = new Uri("https://api.canva.com/rest/v1/designs/{designId}/comments"),
  Headers =
  {
    { "Authorization", "Bearer {token}" },
  },
  Content = new StringContent(
    "{\"message_plaintext\": \"Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!\", \"assignee_id\": \"oUnPjZ2k2yuhftbWF7873o\"}",
    Encoding.UTF8,
    "application/json"
  ),
};

using (var response = await client.SendAsync(request))
{
  response.EnsureSuccessStatusCode();
  var body = await response.Content.ReadAsStringAsync();
  Console.WriteLine(body);
};

package main

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

func main() {
	payload := strings.NewReader(`{
	  "message_plaintext": "Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!",
	  "assignee_id": "oUnPjZ2k2yuhftbWF7873o"
	}`)

	url := "https://api.canva.com/rest/v1/designs/{designId}/comments"
	req, _ := http.NewRequest("POST", 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))
}

$curl = curl_init();
curl_setopt_array($curl, array(
  CURLOPT_URL => "https://api.canva.com/rest/v1/designs/{designId}/comments",
  CURLOPT_CUSTOMREQUEST => "POST",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_HTTPHEADER => array(
    'Authorization: Bearer {token}',
    'Content-Type: application/json',
  ),
  CURLOPT_POSTFIELDS => json_encode([
    "message_plaintext" => "Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!",
    "assignee_id" => "oUnPjZ2k2yuhftbWF7873o"
  ])
));

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

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

require 'net/http'
require 'uri'

url = URI('https://api.canva.com/rest/v1/designs/{designId}/comments')
http = Net::HTTP.new(url.host, url.port)
http.use_ssl = true

request = Net::HTTP::Post.new(url)
request['Authorization'] = 'Bearer {token}'
request['Content-Type'] = 'application/json'
request.body = <<REQUEST_BODY
{
  "message_plaintext": "Great work [oUnPjZ2k2yuhftbWF7873o:oBpVhLW22VrqtwKgaayRbP]!",
  "assignee_id": "oUnPjZ2k2yuhftbWF7873o"
}
REQUEST_BODY

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