Re: [w3c/payment-handler] How would iDeal work? (#251)

@arisc097: Payment handlers [can show an HTML page](https://w3c.github.io/payment-handler/#openwindow-method) in the payment sheet that can prompt users to enter their username, password, PIN, etc.

> Service workers add no value, since all Dutch banks implement a form of two factor auth (SMS, card + reader device) and iDeal transactions require authentication for each transaction.

I don't follow this line of reasoning. For example, one way that service workers provide value is through ability to update the registered payment instruments on user device in the background, without the need for the user to re-visit the banking website. @bdewater: Would you agree?

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