Re: [w3c/webpayments-payment-apps-api] Payment apps and methods, are they the same? (#35)

Should we recommend different URLs for apps and methods? For example, `https://alicepay.xyz/app` vs `https://alicepay.xyz/method`. The implication here being that browser will download `https://alicepay.xyz/app/payment-app.json` that defines the AlicePay payment app and `https://alicepay.xyz/method/payment-method.json` that describes the AlicePay payment method. Merchants would need to specify `supportedMethods: ['https://alicepay.xyz/method']`.

`https://alicepay.xyz/app/payment-app.json` example:
```js
{
  "short_name": "AlicePay",
  "icons": [],
  "payment_methods": ["https://alicepay.xyz/method"],
  "payment_app_service_worker": "/app/sw.js"
}
```

`https://alicepay.xyz/method/payment-method.json` example:
```js
{
  "externally_supported_apps": ["https://alicepay.xyz/app"]
}
```

It feels less cool, but is definitely more clear.

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