Re: [webpayments] What is the appropriate conversational pattern for the API? (#55)

> I would still like to see some description in the spec of what should happen if the event is emitted and there are no listeners and include some timeout behavior.

I thought about this a little and had an idea.

When the website initiates the checkout process by calling `show()` would it be a valid response for the browser to respond immediately with an error if the PaymentRequest is configured to emit events and there are no listeners for those events?

I'll confess to still not being convinced that we should ask developers to configure the PaymentRequest to gather a shipping address in one place (via the `configuration` object) and then define how they want to handle the event somewhere else.

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