 <code>&lt;your_GCM_Sender_Id&gt;&#64;gcm.googleapis.com</code> (GCM sender ID) and the API key as the password, where the sender ID and API key are the same as described in <a href="gs.html">Getting Started</a>.</p>

<p> You can use most XMPP libraries to interact with CCS.</p>

<h3 id="send_msg">Sending messages</h3>

<p>The following snippets illustrate how to perform authentication in CCS.</p>
<h4>Client</h4>
<pre>&lt;stream:stream to=&quot;gcm.googleapis.com&quot; 
        version=&quot;1.0&quot; xmlns