Get

require_once('../yumpu.php');
$yumpu = new Yumpu();
$data = array(
    'return_fields' => 'id,create_date,activate_date,last_login_date,username,email,gender,name,firstname,lastname,birth_date,address,zip_code,city,country,description,website,blog,languge'
);
$getUser = $yumpu->getUser($data);
print_r($getUser);

var yumpu = require('yumpu');
yumpu.setToken('yourToken');
var parameters = {
   return_fields: 'id,create_date,activate_date,last_login_date,username,email,gender,name,firstname,lastname,birth_date,address,zip_code,city,country,description,website,blog,languge'
};
yumpu.getUser(parameters, function(statusCode, document){
   console.log('Status: ' + statusCode);
   console.log(document);
});

Yumpu y = new Yumpu("your access token");
String[] params = {"return_fields=id,create_date,activate_date,last_login_date,username,email,gender,name,firstname,lastname,birth_date,address,zip_code,city,country,description,website,blog,languge"};
System.out.println(y.getUser(params));