Re: [w3c/browser-payment-api] Should API support billing address capture (for tax computation)? (#27)

We must distinguish between data that is required for processing the payment and data that is being requested to streamline the checkout flow.

@djackso3 said:
> The method by which many payment systems work (especially in card) is to verify against billing address so billing address is required for some payment types and providers. In addition, some items will require the KYC address (government functions like BMV transactions). 

Which implies that this data is required for payment processing and should be gathered by the payment app.

However, data that is required to calculate a final amount (i.e. it impacts the tax rate) should be supported as something that can be requested from the user agent so that the website has an opportunity to recalculate the final amount prior to the request being passed to the payment app.

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