Re: [w3c/webpayments-payment-apps-api] The relationship between payment apps and service workers (#33)

> The [manifest] is dependent on an as-yet-undefined update model for the manifest.

I was thinking of using [Cache-Control](https://developers.google.com/web/fundamentals/performance/optimizing-content-efficiency/http-caching?hl=en) for manifest expiration. A programmatic way to update this information is also useful. One possibility is to use Service Workers to manage both payment app's manifest and payment method's manifest. That way push messages can be used to update either piece of information.

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