chromium/components/test/data/payments/larry.example.test/app.json

{
  "name": "Pay with Larry.Example",
  "short_name": "Larry.Example",
  "icons": [{
    "src": "icon.png",
    "sizes": "48x48",
    "type": "image/png"
  }],
  "serviceworker": {
    "src": "app.js",
    "use_cache": false,
    "scope": "https://harry.example.test/webpay"
  }
}