Re: [webpayments] Should we expose status change events in the browser API? (#41)

@jakearchibald,

> Both waitUntil and respondWith take a promise. This means the API knows that an action completes, when it fails, and what the eventual value is, which is useful in the case of respondWith.

I agree. This is the pattern we were looking for.

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https://github.com/w3c/webpayments/issues/41#issuecomment-183391069