private.php

<?php
require 'lib/XeroOAuth.php';

define('BASE_PATH','.');
define("XRO_APP_TYPE",     "Private");
define("OAUTH_CALLBACK",     "oob");
$useragent = "XeroOAuth-PHP Private App Test";

$signatures = array(
    'consumer_key'     => 'YOURCONSUMERKEY',
    'shared_secret'    => 'YOURSECRET',
    // API versions
    'core_version'     => '2.0',
    'payroll_version'  => '1.0',
);

if (XRO_APP_TYPE=="Private"||XRO_APP_TYPE=="Partner") {
    $signatures['rsa_private_key']    = BASE_PATH . '/certs/privatekey.pem';
    $signatures['rsa_public_key']    = BASE_PATH . '/certs/publickey.cer';
}

$XeroOAuth = new XeroOAuth(array_merge(array(
                              'application_type'   => XRO_APP_TYPE,
                              'oauth_callback'     => OAUTH_CALLBACK,
                              'user_agent'         => $useragent,
                            ), $signatures));
include 'tests/testRunner.php';

$initialCheck = $XeroOAuth->diagnostics();
$checkErrors = count($initialCheck);
if ($checkErrors>0) {
    // you could handle any config errors here, or keep on truckin if you like to live dangerously
    foreach ($initialCheck as $check) {
        echo 'Error: ' . $check . PHP_EOL;
    }
} else {
    $session  = persistSession(array(
        'oauth_token'          => $XeroOAuth->config['consumer_key'],
        'oauth_token_secret'   => $XeroOAuth->config['shared_secret'],
        'oauth_session_handle' => '',
    ));
    $oauthSession = retrieveSession();

    if ( isset($oauthSession['oauth_token']) ) {
        $XeroOAuth->config['access_token']  = $oauthSession['oauth_token'];
        $XeroOAuth->config['access_token_secret'] = $oauthSession['oauth_token_secret'];

        include 'tests/tests.php';

    }

    testLinks();

}