diff --git a/index.html b/index.html
index f7761c0..b28918d 100644
--- a/index.html
+++ b/index.html
@@ -6,7 +6,7 @@
   <meta content="w3c/ED" name="w3c-status">
   <meta content="Bikeshed version 5fcd28d6d, updated Tue May 30 13:12:11 2023 -0700" name="generator">
   <link href="https://www.w3.org/TR/secure-payment-confirmation/" rel="canonical">
-  <meta content="2324cf08e4e8ad7189770b4cfdb5e0aae91f08ba" name="document-revision">
+  <meta content="200fb6114b5b957f1d7654ec7ccceaa4ce71f49a" name="document-revision">
 <style>/* Boilerplate: style-autolinks */
 .css.css, .property.property, .descriptor.descriptor {
     color: var(--a-normal-text);
@@ -874,10 +874,11 @@ <h2 class="no-num no-toc no-ref" id="contents">Table of Contents</h2>
         <li><a href="#sctn-modify-user-activation-requirement"><span class="secno">4.1.4</span> <span class="content">Modification of user activation requirement</span></a>
         <li><a href="#sctn-securepaymentconfirmationrequest-dictionary"><span class="secno">4.1.5</span> <span class="content"><span><code>SecurePaymentConfirmationRequest</code></span> Dictionary</span></a>
         <li><a href="#sctn-payment-method-additional-data-type"><span class="secno">4.1.6</span> <span class="content">Payment Method additional data type</span></a>
-        <li><a href="#sctn-steps-to-validate-payment-method-data"><span class="secno">4.1.7</span> <span class="content">Steps to validate payment method data</span></a>
-        <li><a href="#sctn-steps-to-check-if-a-payment-can-be-made"><span class="secno">4.1.8</span> <span class="content">Steps to check if a payment can be made</span></a>
-        <li><a href="#sctn-transaction-confirmation-ux"><span class="secno">4.1.9</span> <span class="content">Displaying a transaction confirmation UX</span></a>
-        <li><a href="#sctn-steps-to-respond-to-a-payment-request"><span class="secno">4.1.10</span> <span class="content">Steps to respond to a payment request</span></a>
+        <li><a href="#sctn-secure-payment-confirmation-available-api"><span class="secno">4.1.7</span> <span class="content">Checking if Secure Payment Confirmation is available</span></a>
+        <li><a href="#sctn-steps-to-validate-payment-method-data"><span class="secno">4.1.8</span> <span class="content">Steps to validate payment method data</span></a>
+        <li><a href="#sctn-steps-to-check-if-a-payment-can-be-made"><span class="secno">4.1.9</span> <span class="content">Steps to check if a payment can be made</span></a>
+        <li><a href="#sctn-transaction-confirmation-ux"><span class="secno">4.1.10</span> <span class="content">Displaying a transaction confirmation UX</span></a>
+        <li><a href="#sctn-steps-to-respond-to-a-payment-request"><span class="secno">4.1.11</span> <span class="content">Steps to respond to a payment request</span></a>
        </ol>
      </ol>
     <li>
@@ -1194,7 +1195,16 @@ <h4 class="heading settled" data-level="1.2.2" id="sctn-sample-authentication"><
    </ol>
    <p>The sample code for authenticating the user follows. Note that the example code
 presumes access to await/async, for easier to read promise handling.</p>
-<pre class="example highlight" id="authentication-example"><a class="self-link" href="#authentication-example"></a><c- k>if</c-> <c- p>(</c-><c- o>!</c->window<c- p>.</c->PaymentRequest<c- p>)</c-> <c- p>{</c-> <c- d>/* PaymentRequest not available; merchant should fallback to traditional flows */</c-> <c- p>}</c->
+<pre class="example highlight" id="authentication-example"><a class="self-link" href="#authentication-example"></a><c- d>/* isSecurePaymentConfirmationAvailable indicates whether the browser */</c->
+<c- d>/* supports SPC. It does not indicate whether the user has a credential */</c->
+<c- d>/* ready to go on this device. */</c->
+<c- a>const</c-> spcAvailable <c- o>=</c->
+  PaymentRequest <c- o>&amp;&amp;</c->
+  PaymentRequest<c- p>.</c->isSecurePaymentConfirmationAvailable <c- o>&amp;&amp;</c->
+  <c- k>await</c-> PaymentRequest<c- p>.</c->isSecurePaymentConfirmationAvailable<c- p>();</c->
+<c- k>if</c-> <c- p>(</c-><c- o>!</c->spcAvailable<c- p>)</c-> <c- p>{</c->
+  <c- d>/* Browser does not support SPC; merchant should fallback to traditional flows. */</c->
+<c- p>}</c->
 
 <c- a>const</c-> request <c- o>=</c-> <c- ow>new</c-> PaymentRequest<c- p>([{</c->
   supportedMethods<c- o>:</c-> <c- u>"secure-payment-confirmation"</c-><c- p>,</c->
@@ -1229,14 +1239,7 @@ <h4 class="heading settled" data-level="1.2.2" id="sctn-sample-authentication"><
     <c- p>},</c->
   <c- p>});</c->
 
-  <c- d>/* canMakePayment indicates whether the browser supports SPC. */</c->
-  <c- d>/* canMakePayment does not indicate whether the user has a credential */</c->
-  <c- d>/* ready to go on this device. */</c->
-
 <c- k>try</c-> <c- p>{</c->
-  <c- a>const</c-> canMakePayment <c- o>=</c-> <c- k>await</c-> request<c- p>.</c->canMakePayment<c- p>();</c->
-  <c- k>if</c-> <c- p>(</c-><c- o>!</c->canMakePayment<c- p>)</c-> <c- p>{</c-> <c- d>/* Browser does not support SPC. Handle error. */</c-> <c- p>}</c->
-
   <c- a>const</c-> response <c- o>=</c-> <c- k>await</c-> request<c- p>.</c->show<c- p>();</c->
   <c- k>await</c-> response<c- p>.</c->complete<c- p>(</c-><c- t>'success'</c-><c- p>);</c->
 
@@ -1426,7 +1429,29 @@ <h4 class="heading settled" data-level="4.1.5" id="sctn-securepaymentconfirmatio
    </dl>
    <h4 class="heading settled" data-level="4.1.6" id="sctn-payment-method-additional-data-type"><span class="secno">4.1.6. </span><span class="content">Payment Method additional data type</span><a class="self-link" href="#sctn-payment-method-additional-data-type"></a></h4>
    <p>The <a data-link-type="dfn" href="https://w3c.github.io/payment-request/#dfn-additional-data-type" id="ref-for-dfn-additional-data-type">payment method additional data type</a> for this payment method is <code class="idl"><a data-link-type="idl" href="#dictdef-securepaymentconfirmationrequest" id="ref-for-dictdef-securepaymentconfirmationrequest②">SecurePaymentConfirmationRequest</a></code>.</p>
-   <h4 class="heading settled" data-level="4.1.7" id="sctn-steps-to-validate-payment-method-data"><span class="secno">4.1.7. </span><span class="content">Steps to validate payment method data</span><a class="self-link" href="#sctn-steps-to-validate-payment-method-data"></a></h4>
+   <h4 class="heading settled" data-level="4.1.7" id="sctn-secure-payment-confirmation-available-api"><span class="secno">4.1.7. </span><span class="content">Checking if Secure Payment Confirmation is available</span><a class="self-link" href="#sctn-secure-payment-confirmation-available-api"></a></h4>
+   <p>A static API is added to <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest①">PaymentRequest</a></code> in order to provide developers a
+simplified method of checking whether Secure Payment Confirmation is available.</p>
+<pre class="idl highlight def"><c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest②"><c- g>PaymentRequest</c-></a> {
+    <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise" id="ref-for-idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a>> <dfn class="dfn-paneled idl-code" data-dfn-for="PaymentRequest" data-dfn-type="method" data-export data-lt="isSecurePaymentConfirmationAvailable()" id="dom-paymentrequest-issecurepaymentconfirmationavailable"><code><c- g>isSecurePaymentConfirmationAvailable</c-></code></dfn>();
+};
+</pre>
+   <dl>
+    <dt data-md><code class="idl"><a data-link-type="idl" href="#dom-paymentrequest-issecurepaymentconfirmationavailable" id="ref-for-dom-paymentrequest-issecurepaymentconfirmationavailable">isSecurePaymentConfirmationAvailable()</a></code>
+    <dd data-md>
+     <p>Upon invocation, a promise is returned that resolves with a value of <code>true</code> if the Secure Payment Confirmation feature is available, or <code>false</code> otherwise.</p>
+   </dl>
+   <p>This allows a developer to perform the following check when deciding whether to
+initiate a SPC flow:</p>
+<pre class="example highlight" id="available-example"><a class="self-link" href="#available-example"></a><c- a>const</c-> spcAvailable <c- o>=</c->
+    PaymentRequest <c- o>&amp;&amp;</c->
+    PaymentRequest<c- p>.</c->isSecurePaymentConfirmationAvailable <c- o>&amp;&amp;</c->
+    <c- k>await</c-> PaymentRequest<c- p>.</c->isSecurePaymentConfirmationAvailable<c- p>();</c->
+</pre>
+   <p class="note" role="note"><span class="marker">NOTE:</span> The use of the static <code class="idl"><a data-link-type="idl" href="#dom-paymentrequest-issecurepaymentconfirmationavailable" id="ref-for-dom-paymentrequest-issecurepaymentconfirmationavailable①">isSecurePaymentConfirmationAvailable</a></code> method is recommended for
+      SPC feature detection, instead of calling <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest-canmakepayment" id="ref-for-dom-paymentrequest-canmakepayment">canMakePayment</a></code> on an already-constructed
+      PaymentRequest object.</p>
+   <h4 class="heading settled" data-level="4.1.8" id="sctn-steps-to-validate-payment-method-data"><span class="secno">4.1.8. </span><span class="content">Steps to validate payment method data</span><a class="self-link" href="#sctn-steps-to-validate-payment-method-data"></a></h4>
    <p>The <a data-link-type="dfn" href="https://w3c.github.io/payment-request/#dfn-steps-to-validate-payment-method-data" id="ref-for-dfn-steps-to-validate-payment-method-data">steps to validate payment method data</a> for this payment method, for an
 input <code class="idl"><a data-link-type="idl" href="#dictdef-securepaymentconfirmationrequest" id="ref-for-dictdef-securepaymentconfirmationrequest③">SecurePaymentConfirmationRequest</a></code> <var>data</var>, are:</p>
    <details class="wpt-tests-block" dir="ltr" lang="en">
@@ -1477,7 +1502,7 @@ <h4 class="heading settled" data-level="4.1.7" id="sctn-steps-to-validate-paymen
        <p>If <var>parsedURL</var>’s <a data-link-type="dfn" href="https://url.spec.whatwg.org/#concept-url-scheme" id="ref-for-concept-url-scheme">scheme</a> is not "<code>https</code>", then throw a <code class="idl"><a data-link-type="idl" href="https://webidl.spec.whatwg.org/#exceptiondef-typeerror" id="ref-for-exceptiondef-typeerror⑧">TypeError</a></code>.</p>
      </ol>
    </ol>
-   <h4 class="heading settled" data-level="4.1.8" id="sctn-steps-to-check-if-a-payment-can-be-made"><span class="secno">4.1.8. </span><span class="content">Steps to check if a payment can be made</span><a class="self-link" href="#sctn-steps-to-check-if-a-payment-can-be-made"></a></h4>
+   <h4 class="heading settled" data-level="4.1.9" id="sctn-steps-to-check-if-a-payment-can-be-made"><span class="secno">4.1.9. </span><span class="content">Steps to check if a payment can be made</span><a class="self-link" href="#sctn-steps-to-check-if-a-payment-can-be-made"></a></h4>
    <p>The <a data-link-type="dfn" href="https://w3c.github.io/payment-request/#dfn-steps-to-check-if-a-payment-can-be-made" id="ref-for-dfn-steps-to-check-if-a-payment-can-be-made">steps to check if a payment can be made</a> for this payment method, for an
 input <code class="idl"><a data-link-type="idl" href="#dictdef-securepaymentconfirmationrequest" id="ref-for-dictdef-securepaymentconfirmationrequest④">SecurePaymentConfirmationRequest</a></code> <var>data</var>, are:</p>
    <details class="wpt-tests-block" dir="ltr" lang="en">
@@ -1547,7 +1572,7 @@ <h4 class="heading settled" data-level="4.1.8" id="sctn-steps-to-check-if-a-paym
     <li data-md>
      <p>Return <code>true</code>.</p>
    </ol>
-   <h4 class="heading settled" data-level="4.1.9" id="sctn-transaction-confirmation-ux"><span class="secno">4.1.9. </span><span class="content">Displaying a transaction confirmation UX</span><a class="self-link" href="#sctn-transaction-confirmation-ux"></a></h4>
+   <h4 class="heading settled" data-level="4.1.10" id="sctn-transaction-confirmation-ux"><span class="secno">4.1.10. </span><span class="content">Displaying a transaction confirmation UX</span><a class="self-link" href="#sctn-transaction-confirmation-ux"></a></h4>
    <p>To avoid restricting User Agent implementation choice, this specification does
 not require a User Agent to display a particular user interface when <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest-show" id="ref-for-dom-paymentrequest-show②">PaymentRequest.show()</a></code> is called and the <a data-link-type="dfn" href="#secure-payment-confirmation-payment-handler" id="ref-for-secure-payment-confirmation-payment-handler①">Secure
 Payment Confirmation payment handler</a> is selected. However, so that a <a data-link-type="dfn" href="https://w3c.github.io/webauthn/#relying-party" id="ref-for-relying-party①⑥">Relying Party</a> can trust the information included in <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientpaymentdata" id="ref-for-dictdef-collectedclientpaymentdata">CollectedClientPaymentData</a></code>, the User Agent MUST ensure that the following
@@ -1605,8 +1630,8 @@ <h4 class="heading settled" data-level="4.1.9" id="sctn-transaction-confirmation
      <p>Act as if the user has seen the transaction details and indicated
 they want to opt out.</p>
    </dl>
-   <h4 class="heading settled" data-level="4.1.10" id="sctn-steps-to-respond-to-a-payment-request"><span class="secno">4.1.10. </span><span class="content">Steps to respond to a payment request</span><a class="self-link" href="#sctn-steps-to-respond-to-a-payment-request"></a></h4>
-   <p>The <a data-link-type="dfn" href="https://w3c.github.io/payment-request/#dfn-steps-to-respond-to-a-payment-request" id="ref-for-dfn-steps-to-respond-to-a-payment-request">steps to respond to a payment request</a> for this payment method, for a given <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest①">PaymentRequest</a></code> <var>request</var> and <code class="idl"><a data-link-type="idl" href="#dictdef-securepaymentconfirmationrequest" id="ref-for-dictdef-securepaymentconfirmationrequest⑤">SecurePaymentConfirmationRequest</a></code> <var>data</var>, are:</p>
+   <h4 class="heading settled" data-level="4.1.11" id="sctn-steps-to-respond-to-a-payment-request"><span class="secno">4.1.11. </span><span class="content">Steps to respond to a payment request</span><a class="self-link" href="#sctn-steps-to-respond-to-a-payment-request"></a></h4>
+   <p>The <a data-link-type="dfn" href="https://w3c.github.io/payment-request/#dfn-steps-to-respond-to-a-payment-request" id="ref-for-dfn-steps-to-respond-to-a-payment-request">steps to respond to a payment request</a> for this payment method, for a given <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest③">PaymentRequest</a></code> <var>request</var> and <code class="idl"><a data-link-type="idl" href="#dictdef-securepaymentconfirmationrequest" id="ref-for-dictdef-securepaymentconfirmationrequest⑤">SecurePaymentConfirmationRequest</a></code> <var>data</var>, are:</p>
    <ol>
     <li data-md>
      <p>Let <var>topOrigin</var> be the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-environment-top-level-origin" id="ref-for-concept-environment-top-level-origin">top-level origin</a> of the <a data-link-type="dfn" href="https://html.spec.whatwg.org/multipage/webappapis.html#relevant-settings-object" id="ref-for-relevant-settings-object">relevant settings object</a> of <var>request</var>.</p>
@@ -1699,7 +1724,7 @@ <h2 class="heading settled" data-level="5" id="sctn-payment-extension-registrati
 authentication ceremony on behalf of the <a data-link-type="dfn" href="https://w3c.github.io/webauthn/#relying-party" id="ref-for-relying-party①⑦">Relying Party</a>, and also adds
 transaction information to the signed cryptogram.</p>
    <p>Notably, a website should not call <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/webappsec-credential-management/#dom-credentialscontainer-get" id="ref-for-dom-credentialscontainer-get">navigator.credentials.get()</a></code> with this extension
-directly; for authentication the extension can only be accessed via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest②">PaymentRequest</a></code> with a "<a data-link-type="dfn" href="#secure-payment-confirmation" id="ref-for-secure-payment-confirmation③">secure-payment-confirmation</a>" payment method.</p>
+directly; for authentication the extension can only be accessed via <code class="idl"><a data-link-type="idl" href="https://w3c.github.io/payment-request/#dom-paymentrequest" id="ref-for-dom-paymentrequest④">PaymentRequest</a></code> with a "<a data-link-type="dfn" href="#secure-payment-confirmation" id="ref-for-secure-payment-confirmation③">secure-payment-confirmation</a>" payment method.</p>
    <details class="wpt-tests-block" dir="ltr" lang="en">
     <summary>Tests</summary>
     <p>This test does not directly correspond to a spec line, but instead
@@ -1725,7 +1750,7 @@ <h2 class="heading settled" data-level="5" id="sctn-payment-extension-registrati
 };
 
 <c- b>dictionary</c-> <dfn class="dfn-paneled idl-code" data-dfn-type="dictionary" data-export id="dictdef-authenticationextensionspaymentinputs"><code><c- g>AuthenticationExtensionsPaymentInputs</c-></code></dfn> {
-  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean②"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-authenticationextensionspaymentinputs-ispayment" id="ref-for-dom-authenticationextensionspaymentinputs-ispayment①"><c- g>isPayment</c-></a>;
+  <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-authenticationextensionspaymentinputs-ispayment" id="ref-for-dom-authenticationextensionspaymentinputs-ispayment①"><c- g>isPayment</c-></a>;
 
   // Only used for authentication.
   <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString⑧"><c- b>USVString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="USVString " href="#dom-authenticationextensionspaymentinputs-rpid" id="ref-for-dom-authenticationextensionspaymentinputs-rpid①"><c- g>rpId</c-></a>;
@@ -1737,7 +1762,7 @@ <h2 class="heading settled" data-level="5" id="sctn-payment-extension-registrati
 };
 </pre>
      <dl>
-      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsPaymentInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionspaymentinputs-ispayment"><code>isPayment</code></dfn> member, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean③">boolean</a></span>
+      <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsPaymentInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionspaymentinputs-ispayment"><code>isPayment</code></dfn> member, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean④">boolean</a></span>
       <dd data-md>
        <p>Indicates that the extension is active.</p>
       <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="AuthenticationExtensionsPaymentInputs" data-dfn-type="dict-member" data-export id="dom-authenticationextensionspaymentinputs-rpid"><code>rpId</code></dfn> member, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString①②">USVString</a></span>
@@ -1950,7 +1975,7 @@ <h3 class="heading settled" data-level="6.1" id="sctn-paymentcredentialinstrumen
 <pre class="idl highlight def"><c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="#dictdef-paymentcredentialinstrument" id="ref-for-dictdef-paymentcredentialinstrument⑥"><c- g>PaymentCredentialInstrument</c-></a> {
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString②④"><c- b>USVString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="USVString " href="#dom-paymentcredentialinstrument-displayname" id="ref-for-dom-paymentcredentialinstrument-displayname②"><c- g>displayName</c-></a>;
     <c- b>required</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-USVString" id="ref-for-idl-USVString②⑤"><c- b>USVString</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="USVString " href="#dom-paymentcredentialinstrument-icon" id="ref-for-dom-paymentcredentialinstrument-icon⑥"><c- g>icon</c-></a>;
-    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean④"><c- b>boolean</c-></a> <a class="idl-code" data-default="true" data-link-type="dict-member" data-type="boolean " href="#dom-paymentcredentialinstrument-iconmustbeshown" id="ref-for-dom-paymentcredentialinstrument-iconmustbeshown②"><c- g>iconMustBeShown</c-></a> = <c- b>true</c->;
+    <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑤"><c- b>boolean</c-></a> <a class="idl-code" data-default="true" data-link-type="dict-member" data-type="boolean " href="#dom-paymentcredentialinstrument-iconmustbeshown" id="ref-for-dom-paymentcredentialinstrument-iconmustbeshown②"><c- g>iconMustBeShown</c-></a> = <c- b>true</c->;
 };
 </pre>
    <p>The <code class="idl"><a data-link-type="idl" href="#dictdef-paymentcredentialinstrument" id="ref-for-dictdef-paymentcredentialinstrument⑦">PaymentCredentialInstrument</a></code> dictionary contains the information to be
@@ -1974,7 +1999,7 @@ <h3 class="heading settled" data-level="6.1" id="sctn-paymentcredentialinstrumen
  what the browser displayed to the user: the icon URL is signed as part
  of the <code class="idl"><a data-link-type="idl" href="#dictdef-collectedclientadditionalpaymentdata" id="ref-for-dictdef-collectedclientadditionalpaymentdata⑥">CollectedClientAdditionalPaymentData</a></code> structure.</p>
      <p class="note" role="note"><span class="marker">NOTE:</span> See related <a href="#sctn-accessibility-considerations">accessibility considerations</a>.</p>
-    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PaymentCredentialInstrument" data-dfn-type="dict-member" data-export id="dom-paymentcredentialinstrument-iconmustbeshown"><code>iconMustBeShown</code></dfn> member, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑤">boolean</a>, defaulting to <code>true</code></span>
+    <dt data-md><dfn class="dfn-paneled idl-code" data-dfn-for="PaymentCredentialInstrument" data-dfn-type="dict-member" data-export id="dom-paymentcredentialinstrument-iconmustbeshown"><code>iconMustBeShown</code></dfn> member, <span> of type <a data-link-type="idl-name" href="https://webidl.spec.whatwg.org/#idl-boolean" id="ref-for-idl-boolean⑥">boolean</a>, defaulting to <code>true</code></span>
     <dd data-md>
      <p>Indicates whether the specified icon must be successfully fetched and shown for the
 request to succeed.</p>
@@ -2266,7 +2291,7 @@ <h3 class="heading settled" data-level="11.2" id="sctn-privacy-probing-credentia
    </ul>
    <p>If the above cases are distinguishable, information is leaked by which a
 malicious <a data-link-type="dfn" href="https://w3c.github.io/webauthn/#relying-party" id="ref-for-relying-party④⑤">Relying Party</a> could identify the user by probing for which <a data-link-type="dfn" href="https://w3c.github.io/webauthn/#public-key-credential" id="ref-for-public-key-credential②">credentials</a> are available.</p>
-   <p>Section <a href="#sctn-steps-to-check-if-a-payment-can-be-made">§ 4.1.8 Steps to check if a payment can be made</a> gives normative steps
+   <p>Section <a href="#sctn-steps-to-check-if-a-payment-can-be-made">§ 4.1.9 Steps to check if a payment can be made</a> gives normative steps
 to mitigate this risk.</p>
    <h3 class="heading settled" data-level="11.3" id="sctn-privacy-joining-payment-instruments"><span class="secno">11.3. </span><span class="content">Joining different payment instruments</span><a class="self-link" href="#sctn-privacy-joining-payment-instruments"></a></h3>
    <p>If a <a data-link-type="dfn" href="https://w3c.github.io/webauthn/#relying-party" id="ref-for-relying-party④⑥">Relying Party</a> uses the same credentials for a given user across
@@ -2413,6 +2438,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-here"><span class="c
      <li><a href="#dom-securepaymentconfirmationrequest-instrument">dict-member for SecurePaymentConfirmationRequest</a><span>, in § 4.1.5</span>
     </ul>
    <li><a href="#dom-authenticationextensionspaymentinputs-ispayment">isPayment</a><span>, in § 5</span>
+   <li><a href="#dom-paymentrequest-issecurepaymentconfirmationavailable">isSecurePaymentConfirmationAvailable()</a><span>, in § 4.1.7</span>
    <li><a href="#dom-securepaymentconfirmationrequest-locale">locale</a><span>, in § 4.1.5</span>
    <li>
     payeeName
@@ -2539,6 +2565,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
     <ul>
      <li><span class="dfn-paneled" id="0d174a15">PaymentCurrencyAmount</span>
      <li><span class="dfn-paneled" id="f679a0bc">PaymentRequest</span>
+     <li><span class="dfn-paneled" id="dd8fd6f0">canMakePayment()</span>
      <li><span class="dfn-paneled" id="999d5cb6">constructor()</span>
      <li><span class="dfn-paneled" id="df23dd0d">currency</span>
      <li><span class="dfn-paneled" id="22176f90">payment handler</span>
@@ -2621,6 +2648,7 @@ <h3 class="no-num no-ref heading settled" id="index-defined-elsewhere"><span cla
      <li><span class="dfn-paneled" id="dca2de17">DOMException</span>
      <li><span class="dfn-paneled" id="ba556545">NotAllowedError</span>
      <li><span class="dfn-paneled" id="b1c1965a">OptOutError</span>
+     <li><span class="dfn-paneled" id="bdbd19d1">Promise</span>
      <li><span class="dfn-paneled" id="ec878a66">RangeError</span>
      <li><span class="dfn-paneled" id="c3e881ef">SecurityError</span>
      <li><span class="dfn-paneled" id="82ca3efc">TypeError</span>
@@ -2692,6 +2720,10 @@ <h2 class="no-num no-ref heading settled" id="idl-index"><span class="content">I
     <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a> <a class="idl-code" data-link-type="dict-member" data-type="boolean " href="#dom-securepaymentconfirmationrequest-showoptout"><c- g>showOptOut</c-></a>;
 };
 
+<c- b>partial</c-> <c- b>interface</c-> <a class="idl-code" data-link-type="interface" href="https://w3c.github.io/payment-request/#dom-paymentrequest"><c- g>PaymentRequest</c-></a> {
+    <c- b>static</c-> <a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-promise"><c- b>Promise</c-></a>&lt;<a class="idl-code" data-link-type="interface" href="https://webidl.spec.whatwg.org/#idl-boolean"><c- b>boolean</c-></a>> <a href="#dom-paymentrequest-issecurepaymentconfirmationavailable"><code><c- g>isSecurePaymentConfirmationAvailable</c-></code></a>();
+};
+
 <c- b>partial</c-> <c- b>dictionary</c-> <a class="idl-code" data-link-type="dictionary" href="https://w3c.github.io/webauthn/#dictdef-authenticationextensionsclientinputs"><c- g>AuthenticationExtensionsClientInputs</c-></a> {
   <a data-link-type="idl-name" href="#dictdef-authenticationextensionspaymentinputs"><c- n>AuthenticationExtensionsPaymentInputs</c-></a> <a data-type="AuthenticationExtensionsPaymentInputs " href="#dom-authenticationextensionsclientinputs-payment"><code><c- g>payment</c-></code></a>;
 };
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