Re: [w3c/payment-handler] Why does a Payment App need to see the line items? (#91)

We've heard feedback from 3rd party payment apps that they would like to display a limited number of **display items**:
- Sub-total
- Tax
- Shipping

This will be even more beneficial for apps that fire the `paymentmethodchange` event, which can affect the tax calculations. As we discussed at the face-to-face in Foster City, some payment handlers may be able to provide shipping addresses, too, which means firing `shippingaddresschange` events. The individual line items are fine to leave out. What do folks think? Is this worth revisiting at the next conference call?

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