Re: [w3c/browser-payment-api] currencySystem seems like a recipe for interop hell (#305)

Ah, ok. So the payment request can be made with an arbitrary system. How is the relationship between the total amount and the currency system established?

Like when given: 

```
{
  "system": "SuperDuperMiles",
  "currency": "USD", // means "Upgrade Special Discount" in SuperDuperMiles
  "value" : "55.00"
}
```

(I've not read through the whole spec yet in full detail, so this might be already answered)


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