Re: [w3c/webpayments] [Payment Request] Should we allow a "polling" mechanism for websites to not invoke the API if there are no enabled methods (#159)

IIRC @adrianba has already said he doesn't want to make PaymentRequest a singleton but that's okay. The privacy problems only start when the website calls `show()`.

I could imagine a mechanism by which if you call `canUserPay()` (or whatever we call this function) and it returns a `true` then we start to restrict things until the merchant calls `show()`.

Or perhaps we stop creation of new PaymentRequests after that has been called on any PaymentRequest? We need to model this a little better I think before we make a concrete proposal

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