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chromium/third_party/blink/web_tests/external/wpt/permissions-policy/payment-supported-by-permissions-policy.tentative.html 

<!DOCTYPE html>
<title>Test that payment is advertised in the feature list</title>
<link rel="help" href="https://w3c.github.io/webappsec-permissions-policy/#dom-permissionspolicy-features">
<link rel="help" href="https://github.com/w3c/payment-request/issues/600">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
    assert_in_array('payment', document.permissionsPolicy.features());
}, 'document.featurePolicy.features should advertise payment.');
</script>