[w3c/payment-request] Add contact info / support URL to show() method? (#687)

There is no method for the merchant to pass its contact information (e.g., a phone number) or a support URL (e.g., a live chat interface) to the payment sheet. This might leave the user without a clear way to get help from the merchant during the payment / checkout experience. 

At Mozilla we will probably add this to our list of user testing / user research topics, but has anyone (@zkoch @rsolomakhin perhaps) run into this with current implementations? 

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https://github.com/w3c/payment-request/issues/687