Re: [w3c/browser-payment-api] Should it be possible to vary amounts depending on payment method (#4)

> > Is it to give user agents the ability to display the amounts alongside each payment option before any are selected by the user?

> That's certainly something I (in my role as a consumer) would want. When I'm selecting a payment method, if the amount I'm paying varies based on that method, that's going to frequently be far more important to me than the affiliation of the payment provider.

Bear in mind, though, that the user agent may not be able to present these amounts to the user. The choice between payment methods may have to happen inside of the payment app. The reason for that is that as per the current spec proposals, the user picks the payment _app_, not the payment _method_ in the user agent. If we consider Adrian's example above, the user could have installed a single payment app that supported `visa`, `bitcoin` **and** `bobpay.com`.

As an aside, I think it is weird to have items that don't add up to the total. As a payer, this would totally put me off. Would we need to have additional display items for each payment method, in order to show what the difference in total amount is caused by?

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