User Access Token

var userId = "12345";
var sdk = new BoxJWTAuth(config);
var token = sdk.UserToken(appUserID);
BoxClient client = sdk.UserClient(userToken, userId);

String userId = "12345";
BoxDeveloperEditionAPIConnection api = new BoxDeveloperEditionAPIConnection.getAppUserConnection(userId, config)

user = client.user(user_id='12345')

auth = JWTAuth(
    client_id='[CLIENT_ID]',
    client_secret='[CLIENT_SECRET]',
    user=app_user,
    jwt_key_id='[JWT_KEY_ID]',
    rsa_private_key_file_sys_path='[CERT.PEM]',
    rsa_private_key_passphrase='[PASSPHRASE]'
)
auth.authenticate_user()
user_client = Client(auth)

var sdk = BoxSDK.getPreconfiguredInstance(config);
var client = sdk.getAppAuthClient('user', '12345');

var userId = "12345";

var claims = new List<Claim>{
    new Claim("sub", userid),
    new Claim("box_sub_type", "user"),
    new Claim("jti", jti),
};

String userId = "12345";

JwtClaims claims = new JwtClaims();
claims.setIssuer(config.boxAppSettings.clientID);
claims.setAudience(authenticationUrl);
claims.setSubject(userId);
claims.setClaim("box_sub_type", "user");
claims.setGeneratedJwtId(64);
claims.setExpirationTimeMinutesInTheFuture(0.75f);

user_id = '12345'

claims = {
    'iss': config['boxAppSettings']['clientID'],
    'sub': user_id,
    'box_sub_type': 'user',
    'aud': authentication_url,
    'jti': secrets.token_hex(64),
    'exp': round(time.time()) + 45
}

let user_id = '12345';

let claims = {
    iss: config.boxAppSettings.clientID,
    sub: user_id,
    box_sub_type: "user",
    aud: authenticationUrl,
    jti: crypto.randomBytes(64).toString("hex"),
    exp: Math.floor(Date.now() / 1000) + 45
};

user_id = '12345'

claims = {
  iss: config['boxAppSettings']['clientID'],
  sub: user_id,
  box_sub_type: 'user',
  aud: authentication_url,
  jti: SecureRandom.hex(64),
  exp: Time.now.to_i + 45
}

$userId = '12345';

$claims = [
  'iss' => $config->boxAppSettings->clientID,
  'sub' => $userId,
  'box_sub_type' => 'user',
  'aud' => $authenticationUrl,
  'jti' => base64_encode(random_bytes(64)),
  'exp' => time() + 45,
  'kid' => $config->boxAppSettings->appAuth->publicKeyID
];