Re: [browser-payment-api] Different card schemes have different mandatory field requirements (#9)

@adrianhopebailie,

> Can you explain why?

If you use a dictionary that only defines the field `x` and you pass `{"x": 1, "y": 2}` to the API, then the `y` field gets removed. You can't add arbitrary other fields -- which means you can't easily extend the object.

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