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The Proof widget runs inside a browser container on mobile. Different containers have different compatibility with Apple Pay, Google Pay, and the verification camera.

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iOS

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Camera permission (verification)

The identity-verification liveness check requires camera access. Add to your Info.plist: 
<key>NSCameraUsageDescription</key>
<string>Required for identity verification</string>

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WKWebView setup

If embedding the widget inside a WKWebView: 
let configuration = WKWebViewConfiguration()
configuration.allowsInlineMediaPlayback = true

let webView = WKWebView(frame: .zero, configuration: configuration)

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Apple Pay compatibility

ContainerApple Pay
Safari✅ Works
WKWebView✅ Works
Chromium-based in-app browser❌ Does not work
If Apple Pay matters for your users, make sure the widget opens in Safari or WKWebView — not in a Chromium-based in-app browser.

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Android

Use Chrome Custom Tabs for the best compatibility. Google Pay works, the camera works, and no extra configuration is needed.
CustomTabsIntent.Builder builder = new CustomTabsIntent.Builder();
CustomTabsIntent customTabsIntent = builder.build();
customTabsIntent.launchUrl(context, Uri.parse(widgetUrl));

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WebView setup

If you use WebView instead of Chrome Custom Tabs: AndroidManifest.xml: 
<uses-permission android:name="android.permission.CAMERA" />
WebView settings: 
webView.getSettings().setJavaScriptEnabled(true);
webView.getSettings().setMediaPlaybackRequiresUserGesture(false);
webView.setWebChromeClient(new WebChromeClient() {
    @Override
    public void onPermissionRequest(PermissionRequest request) {
        request.grant(request.getResources());
    }
});

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Google Pay compatibility

ContainerGoogle Pay
Chrome Custom Tabs✅ Works
WebView❌ Does not work
Google Pay does not work in Android WebView. If your users need Google Pay, use Chrome Custom Tabs.

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Compatibility summary

FeatureiOS SafariiOS WKWebViewAndroid Custom TabsAndroid WebView
Verification camera✅✅✅✅ (with config)
Apple Pay✅✅❌❌
Google Pay❌❌✅❌