Re: [w3c/browser-payment-api] Support different amounts per payment method. (#211)

@ianbjacobs,

-1 to  `PaymentMethodsChange` or any more interactive imperative mechanisms than are absolutely necessary. Declarative mechanisms are better (Rule of Least Power) and allow for more interesting, smarter, innovative systems to be built.

Furthermore, if we're going to start allowing payment instruments to be selected in browser, we will need to consider the ability to select more than one for a particular payment request -- and all the UI and details and complexity that that entails. I think that this should be the domain of Payment Apps, particularly in version 1. Let's get some implementation experience with something simpler before pushing all of the complexity into the user agent.

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