rsolomakhin commented on this pull request.
A payment handler is able to enumerate all of its own windows through the [Clients](https://developer.mozilla.org/en-US/docs/Web/API/Clients) API in service worker, so it can take the appropriate actions inside of the `'paymentrequest'` event to either abort the current payment, abort other ongoing payments, or allow multiple ongoing payments. We should not need to add anything else to the payment handler spec for now. Does that make sense?
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