Re: [w3c/browser-payment-api] The "data" member of PaymentMethodData doesn't seem to actually be used for anything (#338)

Here's an example for a merchant that accepts only debit cards, regardless of whether they are passed in the raw via `'basic-card'` or encrypted via `'tokenized-card'`.

```javascript
new PaymentRequest(
    [{
        supportedMethods: ['basic-card', 'tokenized-card'],
        data: {supportedTypes: ['debit']}
    }],
    shoppingCart);
```

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