SDKを使用しないOAuth 2.0

var baseUrl = "https://account.box.com/api/oauth2/authorize";
var clientId = "[CLIENT_ID]";
var authorizationUrl = $"{baseUrl}?client_id={clientId}&response_type=code";

String baseUrl = "https://account.box.com/api/oauth2/authorize";
String clientId = "[CLIENT_ID]";
String authorizationUrl = String.format("%s?client_id=%s&response_type=code", baseUrl, clientId);

base_url = 'https://account.box.com/api/oauth2/authorize'
client_id = '[CLIENT_ID]'
authorizationUrl = f'{base_url}?client_id=${client_id}&response_type=code'

var baseUrl = "https://account.box.com/api/oauth2/authorize";
var clientId = "[CLIENT_ID]";
var authorizationUrl = `${baseUrl}?client_id=${clientId}&response_type=code`;

var authorizationUrl = $"{baseUrl}?client_id={clientId}&response_type=code";
// redirectTo(authorizationUrl);

String authorizationUrl = String.format("%s?client_id=%s&response_type=code", baseUrl, clientId);

// response.redirect(authorizationUrl);

auth_url = f'{base_url}?client_id=${client_id}&response_type=code'
// redirect(auth_url, code=302)

var authorizationUrl = `${baseUrl}?client_id=${clientId}&response_type=code`;
// res.redirect(authorize_url)

using System.Net;
using System.Net.Http;
using Newtonsoft.Json;

String authenticationUrl = "https://api.box.com/oauth2/token";
var client = new HttpClient();

var content = new FormUrlEncodedContent(new[]
{
    new KeyValuePair<string, string>("grant_type", "authorization_code"),
    new KeyValuePair<string, string>("code", "[CODE]"),
    new KeyValuePair<string, string>("client_id", "[CLIENT_ID]"),
    new KeyValuePair<string, string>("client_secret", "[CLIENT_SECRET]")
});

var response = client.PostAsync(authenticationUrl, content).Result;

class Token
{
    public string access_token { get; set; }
}

var data = response.Content.ReadAsStringAsync().Result;
var token = JsonConvert.DeserializeObject<Token>(data);
var accessToken = token.access_token;

String authenticationUrl = "https://api.box.com/oauth2/token";

List<NameValuePair> params = new ArrayList<NameValuePair>();

params.add(new BasicNameValuePair("grant_type", "authorization_code"));
params.add(new BasicNameValuePair("code", "[CODE]"));
params.add(new BasicNameValuePair("client_id", "[CLIENT_ID]"));
params.add(new BasicNameValuePair("client_secret", "[CLIENT_SECRET]"));

CloseableHttpClient httpClient = HttpClientBuilder.create().disableCookieManagement().build();

HttpPost request = new HttpPost(authenticationUrl);
request.setEntity(new UrlEncodedFormEntity(params));

CloseableHttpResponse httpResponse = httpClient.execute(request);
HttpEntity entity = httpResponse.getEntity();

String response = EntityUtils.toString(entity);
httpClient.close();

class Token {
    String access_token;
}

Token token = (Token) gson.fromJson(response, Token.class);
String accessToken = token.access_token;

authentication_url = "https://api.box.com/oauth2/token";

params = urlencode({
    'grant_type': 'authorization_code',
    'code': '[CODE]',
    'client_id': '[CLIENT_ID]',
    'client_secret': '[CLIENT_SECRET]'
}).encode()

request = Request(authentication_url, params)
response = urlopen(request).read()
access_token = json.loads(response)['access_token']

const authenticationUrl = "https://api.box.com/oauth2/token";

let accessToken = await axios
    .post(
        authenticationUrl,
        querystring.stringify({
            grant_type: "authorization_code",
            code: "[CODE]",
            client_id: "[CLIENT_ID]",
            client_secret: "[CLIENT_SECRET]",
        })
    )
    .then((response) => response.data.access_token);