default"</code> Action is linked to <code>NodeB</code> and runs <code>NodeB</code>.</li>
<li>If <code>NodeB.postAsync()</code> returns <code>"default"</code> but we didn't define <code>NodeB &gt;&gt; somethingElse</code>, the flow ends there.</li>
</ul>
<h3 id="example-branching-looping">Example: Branching &amp; Looping</h3>
<p>Here's a simple expense approval flow that demonstrates branching and looping. The <code>ReviewExpenseNode</code> can return three possible Actions:</p>
<ul>
<li><code>"approved"</co