Re: [w3c/payment-request] Editorial: describe security mitigations #675 (#683)

ianbjacobs commented on this pull request.



> +          <li>A <a>top-level browsing context</a> need to explicitly grant an
+          <a>iframe</a> the ability to access the <a>PaymentRequest</a>
+          interface via the <a>allowpaymentrequest</a> attribute. This prevents
+          embedded third-party content from accessing the interfaces of the
+          <cite>Payment Request API</cite> without the <a>top-level browsing
+          context</a>'s permission.
+          </li>
+          <li>In the definition of <a>canMakePayment()</a> the Working Group
+          seeks a balance between user experience and date protection. As
+          defined, <a>canMakePayment()</a> provides the party that calls the
+          API with information about the user's environment. To reduce the
+          potential for abuse, implementers plan a number of mitigations,
+          including rate-limiting <a>canMakePayment()</a> calls from the same
+          origin.
+          </li>
+          <li>A user agent can limit matching (in <a>show()</a> and

It is my understanding that implementations are doing this. @adrianba, @zkoch, @rsolomakhin do you have any experience to share or any new thoughts on this topic?

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