dt>Returns:</dt>
<dd>The interaction id of the payload.</dd>
</dl>
</div>
</section>
</li>
<li>
<section class="detail" id="customData()">
<h3>customData</h3>
<div class="horizontal-scroll">
<div class="member-signature"><span class="return-type"><a href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/util/Optional.html" title="class or interface in java.util" class="external-link">Optional</a>&lt;<a href="https://docs.oracle.com/en/java/javase/24/docs/api/java.base/java/lang/String.html"