Re: [w3c/payment-request] PaymentRequest - Bluetooth connector (#865)

Starting with the rationale.  Mobile phones have become the center for just about everything, nowadays also including payments.   However, some people (quite a bunch in fact) still prefer doing their on-line business on a "PC".  The question is then how to combine the mobile phone holding payment credentials and the PC/Web.   The current version of `PaymentRequest` doesn't do this particularly well.

In this proposal I envision the phone docking into the browser and enumerating its payment methods.

In the `PaymentRequest` UI on the PC you would see the new methods (maybe attributed with a icon indicating that they reside on a mobile device).

If the user selects a "mobile" payment method the phone would show a pay interface.

For `PaymentRequest` it is just another driver.

The security decisions would in this model be delegated to the mobile device like already is the case for the QR code predecessors.  I haven't had the opportunity to test the Apple solution which I believe does something quite similar.

It probably requires a rather deep integration in the mobile end as well.

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