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

Hi @rsolomakhin, good question. 

Would this work:

 * The payment handler returns billing address information in the Payment Handler API response.
 * Upon receipt the browser fires "onbillingaddresschange" which enables the merchant to update
   the total. If the payment handler does not return a billing address (e.g., because the payment
   method does not require it, or the transaction does not require it, or the user has not provided
   one), no event fires.
 * If the billing address has an impact on the total, then the merchant can update it in the sheet,
   prompting the user to confirm (with a message indicating that the total has changed based
   on the billing address). If the billing address does not have an impact on the total, then the
   merchant can simply close the sheet at that point.

Does that make sense?

Ian


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