[w3c/payment-handler] Support delegating collection of shipping address and other user data to Payment Handler (#337)

Today if a merchant requests shipping address or payer's contact information, the data collection is always handled by the browser. At last week's WPWG FTF in Foster City, there was interest among payment providers to be able to provide this information. Supporting this delegation can lead to better user experience because the payment app may have more accurate information than the browser.

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Reply to this email directly or view it on GitHub:
https://github.com/w3c/payment-handler/issues/337