Re: [w3c/payment-request] Validate .data on construction (PR #976)

Would it be useful to export a `dfn` here that can be pointed to by other specs, similarly to https://w3c.github.io/payment-request/#dfn-steps-to-check-if-a-payment-can-be-made (and respond, and change)? It's much easier to write other specs when you can say `The [=steps to check if a payment can be made=] for [=my new payment method=] are: ...`.

(Also, I assume this change doesn't obsolete the `steps to check if a payment can be made` because technically handlers to methods are N:1, though in practice I think it is 1:1?)

(Also also, reminder - `steps to check if a payment can be made` have *nothing* to do with canMakePayment, they're actually a check used inside of `show()` :D)

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