diff --git a/testing/web-platform/meta/payment-request/idlharness.https.window.js.ini b/testing/web-platform/meta/payment-request/idlharness.https.window.js.ini
index 876da8e93c9d..e596fd45e069 100644
--- a/testing/web-platform/meta/payment-request/idlharness.https.window.js.ini
+++ b/testing/web-platform/meta/payment-request/idlharness.https.window.js.ini
@@ -272,3 +272,48 @@
   [PaymentRequestUpdateEvent interface: calling updateWith([object Object\]) on new PaymentRequestUpdateEvent("paymentrequestupdate") with too few arguments must throw TypeError]
     expected: FAIL
 
+  [MerchantValidationEvent interface: existence and properties of interface prototype object's "constructor" property]
+    expected: FAIL
+
+  [MerchantValidationEvent interface object length]
+    expected: FAIL
+
+  [MerchantValidationEvent must be primary interface of new MerchantValidationEvent("merchantvalidation")]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: new MerchantValidationEvent("merchantvalidation") must inherit property "complete([object Object\])" with the proper type]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: existence and properties of interface prototype object]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: existence and properties of interface prototype object's @@unscopables property]
+    expected: FAIL
+
+  [MerchantValidationEvent interface object name]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: existence and properties of interface object]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: attribute validationURL]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: operation complete([object Object\])]
+    expected: FAIL
+
+  [PaymentRequest interface: attribute onmerchantvalidation]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: calling complete([object Object\]) on new MerchantValidationEvent("merchantvalidation") with too few arguments must throw TypeError]
+    expected: FAIL
+
+  [Stringification of new MerchantValidationEvent("merchantvalidation")]
+    expected: FAIL
+
+  [MerchantValidationEvent interface: new MerchantValidationEvent("merchantvalidation") must inherit property "validationURL" with the proper type]
+    expected: FAIL
+
+  [PaymentRequest interface: paymentRequest must inherit property "onmerchantvalidation" with the proper type]
+    expected: FAIL
+