[Constructor(DOMString type, optional MerchantValidationEventInit eventInitDict),

SecureContext, Exposed=Window]

interface MerchantValidationEvent : Event {

readonly attribute USVString validationURL;

void complete(Promise<any> merchantSessionPromise);

};

</pre>

<section>

<h3>

<dfn data-lt=

settings object</a>’s <a data-cite=

"!html/multipage/webappapis.html#api-base-url">API base URL</a>.

</li>

<li data-link-for="MerchantValidationEventInit">Let

<var>validationURL</var> be the result of <a data-cite=

<var>base</var>.

</li>

<li>If <var>validationURL</var> is failure, throw a

<li>Initialize <var>event</var>.<a>validationURL</a> attribute to

<var>validationURL</var>.

</li>

<li>Initialize <var>event</var>.<a data-lt=

"mechvalidation.waitForUpdate">[[\waitForUpdate]]</a> to false.

</li>

</h3>

<pre class="idl">

dictionary MerchantValidationEventInit : EventInit {

USVString validationURL = "";

};

</pre>

<dfn>validationURL</dfn> member

A URL from which a developer would fetch <a>payment

handler</a>-specific verification data.

</section>

</section>

<section data-dfn-for="PaymentMethodChangeEvent" data-link-for=

<dfn>methodName</dfn> member

</dt>

<dd>

</dd>

<dt>

<dfn>methodDetails</dfn> member

developer can fetch <a>payment handler</a>-specific verification

data.

</li>

<li>

<a>Queue a task</a> on the <a>user interaction task source</a> to

run the following steps:

<li>Assert: <var>request</var>.<a>[[\updating]]</a> is false.

</li>

<li>Assert: <var>request</var>.<a>[[\state]]</a> is

<li>Let <var>eventInitDict</var> be an new

<a>MerchantValidationEventInit</a> dictionary.

</li>

</li>

<li>Let <var>event</var> be the result of <a data-cite=

"dom#concept-event-constructor">constructing</a> a