curl --request GET \
  --url https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members \
  --header 'Authorization: Bearer <token>' \
  --header 'Notion-Version: <notion-version>'

import requests

url = "https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members"

headers = {
    "Notion-Version": "<notion-version>",
    "Authorization": "Bearer <token>"
}

response = requests.get(url, headers=headers)

print(response.text)

const options = {
  method: 'GET',
  headers: {'Notion-Version': '<notion-version>', Authorization: 'Bearer <token>'}
};

fetch('https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members', 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.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members",
  CURLOPT_RETURNTRANSFER => true,
  CURLOPT_ENCODING => "",
  CURLOPT_MAXREDIRS => 10,
  CURLOPT_TIMEOUT => 30,
  CURLOPT_HTTP_VERSION => CURL_HTTP_VERSION_1_1,
  CURLOPT_CUSTOMREQUEST => "GET",
  CURLOPT_HTTPHEADER => [
    "Authorization: Bearer <token>",
    "Notion-Version: <notion-version>"
  ],
]);

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

curl_close($curl);

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

package main

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

func main() {

	url := "https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members"

	req, _ := http.NewRequest("GET", url, nil)

	req.Header.Add("Notion-Version", "<notion-version>")
	req.Header.Add("Authorization", "Bearer <token>")

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

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

	fmt.Println(string(body))

}

HttpResponse<String> response = Unirest.get("https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members")
  .header("Notion-Version", "<notion-version>")
  .header("Authorization", "Bearer <token>")
  .asString();

require 'uri'
require 'net/http'

url = URI("https://api.notion.com/admin/v1/spaces/{space_id}/groups/{group_id}/members")

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

request = Net::HTTP::Get.new(url)
request["Notion-Version"] = '<notion-version>'
request["Authorization"] = 'Bearer <token>'

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

{
  "object": "list",
  "type": "group_membership",
  "results": [
    {
      "object": "group_membership",
      "group_id": "<string>",
      "member": {
        "type": "user",
        "user_id": "<string>"
      },
      "role": "owner"
    }
  ],
  "has_more": true,
  "next_cursor": "<string>"
}

{
  "object": "error",
  "code": "validation_error",
  "status": 400,
  "message": "The request body is invalid."
}

{
  "object": "error",
  "code": "unauthorized",
  "status": 401,
  "message": "Unauthorized."
}

{
  "object": "error",
  "code": "restricted_resource",
  "status": 403,
  "message": "Forbidden."
}

{
  "object": "error",
  "code": "object_not_found",
  "status": 404,
  "message": "Not found."
}

{
  "object": "error",
  "code": "conflict_error",
  "status": 409,
  "message": "The request conflicts with the current resource state."
}

{
  "object": "error",
  "code": "rate_limited",
  "status": 429,
  "message": "Rate limited."
}

{
  "object": "error",
  "code": "internal_server_error",
  "status": 500,
  "message": "An unexpected error occurred."
}

{
  "object": "error",
  "code": "service_unavailable",
  "status": 503,
  "message": "Service temporarily unavailable."
}