diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1ae8e64
--- /dev/null
+++ b/README.md
@@ -0,0 +1,8 @@
+Fake Reservation System
+=======================
+
+Allows you to send mails to your Google Inbox that trigger Google Now cards.
+
+To set up a server for yourself, you have to get an API key from
+https://console.developers.google.com/apis/, download the `client_secret.json`
+and put it into the root directory.
diff --git a/index.php b/index.php
index 0d7760e..3937e55 100644
--- a/index.php
+++ b/index.php
@@ -13,10 +13,32 @@ $data = array();
 
 $client = new Google_Client();
 $client->setAuthConfigFile('client_secret.json');
-$client->setRedirectUri('https://raspi.mbirth.de/dev/FRS/');
 $client->addScope(Google_Service_Oauth2::USERINFO_EMAIL);
 
-$data['auth_url'] = $client->createAuthUrl();
+session_start();
+
+if (isset($_GET['code']) && $_GET['code']) {
+    // OAuth2 result
+    $client->authenticate($_GET['code']);
+    $_SESSION['access_token'] = $client->getAccessToken();
+    header('Location: ' . $client->getRedirectUri());
+    exit(0);
+}
+
+if (isset($_SESSION['access_token']) && $_SESSION['access_token']) {
+    // Authenticated
+    $client->setAccessToken($_SESSION['access_token']);
+
+    $data['auth_needed'] = false;
+
+    $oauth = new Google_Service_Oauth2($client);
+    $userdata = $oauth->userinfo->get();
+    $data['userdata'] = print_r($userdata, true);
+} else {
+    // Not authenticated
+    $data['auth_needed'] = true;
+    $data['auth_url'] = $client->createAuthUrl();
+}
 
 $tpl = $m->loadTemplate('index_html');
 echo $tpl->render($data);
diff --git a/templates/index_html.mustache b/templates/index_html.mustache
index f44a943..2110c91 100644
--- a/templates/index_html.mustache
+++ b/templates/index_html.mustache
@@ -8,9 +8,17 @@
 
 <h3>What is this?</h3>
 
+{{# auth_needed}}
 <p>
 <a href="{{auth_url}}"><img id="signin-button" src="img/btn_google_signin_dark_normal_web.png"/></a>
 </p>
+{{/ auth_needed}}
+
+{{# userdata}}
+<p>
+<pre>{{userdata}}</pre>
+</p>
+{{/ userdata}}
 
 <p>
             Hello, world!