diff --git a/test/events/all.js b/test/events/all.js
index 436143ba059d..c04107462b54 100644
--- a/test/events/all.js
+++ b/test/events/all.js
@@ -134,8 +134,7 @@ before(async () => {
         eventInterfaces.filter(iface => !usedEventInterfaces.has(iface)),
         [
           'SnapEvent', // pending https://github.com/w3c/csswg-drafts/issues/7442
-          'CustomEvent', // not used by any spec
-          'PaymentRequestUpdateEvent' // pending https://github.com/w3c/payment-request/issues/991
+          'CustomEvent' // not used by any spec
         ],
         "Event interfaces are defined in the platform but not referenced from extracted events"
       );
diff --git a/tools/amend-event-data.js b/tools/amend-event-data.js
index eae41d4751bf..62f30d6bcfba 100644
--- a/tools/amend-event-data.js
+++ b/tools/amend-event-data.js
@@ -286,6 +286,18 @@ const patches = {
       change: { interface: 'DeviceOrientationEvent' }
     }
   ],
+  'payment-request-1.1': [
+    // Spec uses an indirect algo to fire events:
+    // https://www.w3.org/TR/payment-request/#dfn-paymentrequest-updated-algorithm
+    // That said, extraction could perhaps process the informative events
+    // summary table to extract the interface name at some point:
+    // https://www.w3.org/TR/payment-request/#summary
+    {
+      pattern: { type: /^(shipping|payer).*change$/ },
+      matched: 3,
+      change: { interface: "PaymentRequestUpdateEvent" }
+    }
+  ],
   // TODO: to-be-idenfied bug in reffy, see https://github.com/w3c/webref/commit/348b90a37475563d924f4da8156c290ca27d77e2#diff-3877beb696dd5561959ba0c9b8c1485e9c78fbed53b1ec6723ae68621940e0c7
   'periodic-background-sync': [
     {