List side letters.

curl -X GET "https://api.mattermode.com/v1/entities/{id}/side_letters"

fetch("https://api.mattermode.com/v1/entities/{id}/side_letters", {  method: "GET"})

package mainimport (  "fmt"  "net/http"  "io/ioutil")func main() {  url := "https://api.mattermode.com/v1/entities/{id}/side_letters"  req, _ := http.NewRequest("GET", url, nil)  res, _ := http.DefaultClient.Do(req)  defer res.Body.Close()  body, _ := ioutil.ReadAll(res.Body)  fmt.Println(res)  fmt.Println(string(body))}

import requestsheaders = {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",}resp = requests.get(    "https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/side_letters",    headers=headers,)resp.raise_for_status()print(resp.json())

import java.net.URI;import java.net.http.HttpClient;import java.net.http.HttpRequest;import java.net.http.HttpResponse;import java.net.http.HttpResponse.BodyHandlers;import java.time.Duration;HttpClient client = HttpClient.newBuilder()  .connectTimeout(Duration.ofSeconds(10))  .build();HttpRequest.Builder requestBuilder = HttpRequest.newBuilder()  .uri(URI.create("https://api.mattermode.com/v1/entities/{id}/side_letters"))  .GET()  .build();try {  HttpResponse<String> response = client.send(requestBuilder.build(), BodyHandlers.ofString());  System.out.println("Status code: " + response.statusCode());  System.out.println("Response body: " + response.body());} catch (Exception e) {  e.printStackTrace();}

using System;using System.Net.Http;using System.Text;var client = new HttpClient();var response = await client.GetAsync("https://api.mattermode.com/v1/entities/{id}/side_letters");var responseBody = await response.Content.ReadAsStringAsync();

curl --request GET 'https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/side_letters' \  --header 'Authorization: Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc' \  --header 'Matter-Version: 2026-06-10'

const response = await fetch("https://api.mattermode.com/v1/entities/ent_Nq3KcAbc/side_letters", {  method: "GET",  headers: {    "Authorization": "Bearer sk_test_4eC39HqLyjWDarjtT1zdp7dc",    "Matter-Version": "2026-06-10",  },});if (!response.ok) {  throw new Error(`Matter API ${response.status}: ${await response.text()}`);}const data = await response.json();console.log(data);