Re: [w3c/payment-request] Support payment method errors (#749)

After chatting with @marcoscaceres and @rsolomakhin we would like clarification on one point: if a merchant needs a billing address (e.g., for VAT computation), will that merchant need the billing address for EVERY payment method the merchant would accept?

The answer to this question affects the design, roughly as follows:
 - If the merchant needs a billing address for EVERY payment method, it is easier to indicate that once through the API.
 - Otherwise, the merchant will need to request the billing address on a per payment-method basis. 

As an example, would a merchant ever need billing address for a basic card payment, and not need a billing address for payment by credit transfer, or cryptocurrency, or real-time financing, etc.?

@lyverovski, @Krystosterone, @michelle-stripe, @asolove-stripe, @mattsaxon, @vkuntz, @frank-hoffmann we welcome your input here.

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