updateCustomField() public static method

public static updateCustomField ( $customFieldId, $arrayOfValues, Infusionsoft_App $app = null )
$app Infusionsoft_App
<form>
            customFieldId: <input type="text" name="customFieldId" value="<?php 
if (isset($_REQUEST['customFieldId'])) {
    echo htmlspecialchars($_REQUEST['customFieldId']);
}
?>
"><br/>
            values: <input type="text" name="values" value="<?php 
if (isset($_REQUEST['values'])) {
    echo htmlspecialchars($_REQUEST['values']);
}
?>
"><br/>
    <input type="submit">
<input type="hidden" name="go">
</form>
<?php 
include '../infusionsoft.php';
include 'testUtils.php';
if (isset($_REQUEST['go'])) {
    $out = Infusionsoft_DataService::updateCustomField($_REQUEST['customFieldId'], $_REQUEST['values']);
    var_dump($out);
}