Re: [webpayments] How are third-party native wallets integrated? (#42)

@adrianba @travisleithead FWIW, this is what I'm proposing and have implemented: https://cyberphone.github.io/openkeystore/resources/docs/web2native-bridge.pdf#page=4

Applied to the Web Payment API it could work like this:
```code
                         Web Payment API
 (maps methods into serialized JSON-formatted request/response pairs)
                                |
            Bi-directional channel using an IPC mechanism
                                |
                            Wallet App
```
A more complete specification is available at: https://github.com/cyberphone/web2native-bridge

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https://github.com/w3c/webpayments/issues/42#issuecomment-195243743