pipl_test_code_and_error

<?php
// Error I get:
///////////////////////////////
// No valid name/username/phone/email/address/user_id/url
///////////////////////////////

///////////////////////////////
//// My Code:
///////////////////////////////
$email = "test@test.com";
$first_name = "John";
$last_name = "Test";

$configuration = new PiplApi_SearchRequestConfiguration();
$configuration->api_key = $api_key;
$configuration->use_https = true;
$request = new PiplApi_SearchAPIRequest(
    array(
        'email' => $email,
        'first_name' => $first_name,
        'last_name' => $last_name
    ), $configuration);
$response = $request->send();
return $response;