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

@haavardmolland : You're correct that Android OS allows such linked app to handle URLs by default. (Little known fact: users can still change the URL handler app in settings.) Apps have access to read the SHA256 fingerprint of the payment app's signer cert as well. See [PackageInfo.signatures](http://developer.android.com/reference/android/content/pm/PackageInfo.html#signatures).

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https://github.com/w3c/webpayments/issues/42#issuecomment-185819211