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

I think that native apps will connect through OS-specific means, like intents on Android. Here's how user agent code would look like on Android, I imagine:

````java
Intent intent = new Intent("org.w3.intent.action.PAY", Uri.parse("https://bobpay.xyz"));
intent.putExtra("Details", "{\"price\": 5500, \"currency\": \"USD\", \"merchant\": \"superstore1\"}");
intent.putExtra("SchemeData", "{\"bobPaySpecificField\": \"foo\"}");
startActivityForResult(intent, 0);
````

The payment app should send back the result as a string (or HashMap) plus the result code. Like so:

````java
Intent result = new Intent("org.w3.intent.action.PAY");
result.putExtra("InstrumentDetails", "{\n"
        + "  \"cardNumber\": \"4111111111111111\",\n"
        + "  \"nameOnCard\": \"Bob J. Paymentman\",\n"
        + "  \"expMonth\":   \"12\",\n"
        + "  \"expYear\":    \"2016\",\n"
        + "  \"cvv2\":       \"123\"\n"
        +"}");
setResult(Activity.RESULT_OK, result);
finish();
````

We would need similar examples for the other platforms, but I am less familiar with them.

*Should we pass in a generic data structure like HashMap or the unparsed string to the payment app?*

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https://github.com/w3c/webpayments/issues/42#issuecomment-166386694