Re: [webpayments] PROPOSAL: Pass the list of supported payment methods and the method-specific data in a single object (#77)

As payment methods may each have their own special data, I recommend we simply enumerate them each individually, even if that means repeating prices (note that they may often not be the same price anyway). I don't think that will be difficult for payees to generate and it will be less ambiguous. So I was thinking something more like this:

```js
var paymentRequest = {
  acceptablePayment: [{
    paymentMethod: "VisaLegacy",
    transfer: {
      amount: '54.18',
      currency: 'USD'
    },
    specialVisaLegacyThing: 1,
    ...
  }, {
    paymentMethod: "MastercardLegacy",
    transfer: {
      amount: '54.18',
      currency: 'USD'
    },
    specialMastercardLegacyThing: 7
    ...
  }, {
    paymentMethod: "DiscoverLegacy",
    transfer: {
      amount: '60.00',
      currency: 'USD'
    },
    specialDiscoverLegacyThing: "foo",
    ...
  }, ...],
  ...
};
```

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https://github.com/w3c/webpayments/issues/77#issuecomment-179023013