<p>Called at the beginning of the the API <code>\XF\Api\App</code> object startup process.</p>

<p>Callback signature:</p>
<blockquote><code><em>\XF\Api\App</em> $app</code></blockquote>

<p>Arguments:</p>
<ol>
    <li><code><em>\XF\Api\App</em> $app</code> - API App object.</li>
</ol>