DOMException</a>.

<p class="note" data-link-for="PaymentRequest">

This allows user agents to apply heuristics to detect and prevent

abuse of the <a>canMakePayment()</a> method for fingerprinting

purposes, such as creating <a>PaymentRequest</a> objects with a

variety of supported <a>payment methods</a> and calling

<a>canMakePayment()</a> on them one after the other. For example,

a user agent may restrict the number of successful calls that can

be made based on the <a>top-level browsing context</a> or the

time period in which those calls were made.

</p>

<section class="informative">

</section>

<section id="privacy">

<h2>

Privacy Considerations

</h2>

<section>

<h2>

canMakePayment() protections

The <a>canMakePayment()</a> method enables the payee to call

<a>show()</a> if the user is ready to take advantage of the API, or

to fall back to a legacy checkout experience if not. Because this

method shares some information with the payee, user agents are

expected to protect the user from abuse of the method, for example,

by restricting the number or frequency of calls.