WebView KYC：モバイルでの本人確認の導入方法

curl -X POST https://verification.didit.me/v3/session/ \
  -H "x-api-key: YOUR_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "workflow_id": "your-workflow-id",
    "vendor_data": "user-123",
    "callback": "https://yourapp.com/callback"
  }'

{
  "session_id": "11111111-2222-3333-4444-555555555555",
  "session_number": 43762,
  "session_token": "3FaJ9wLqX2Mz",
  "url": "https://verify.didit.me/session/3FaJ9wLqX2Mz",
  "vendor_data": "user-123",
  "metadata": null,
  "status": "Not Started",
  "workflow_id": "11111111-2222-3333-4444-555555555555",
  "workflow_version": 3,
  "callback": "https://yourapp.com/callback"
}

npm install react-native-webview
# or with Expo
npx expo install react-native-webview

import React from 'react';
import { WebView } from 'react-native-webview';

const VerificationScreen = ({ sessionUrl, onComplete }) => {
  return (
    <WebView
      source={{ uri: sessionUrl }}
      // Required: generic mobile user agent
      userAgent="Mozilla/5.0 (Linux; Android 10; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36"
      // Required for camera/media
      mediaPlaybackRequiresUserAction={false}
      allowsInlineMediaPlayback={true}
      // Android-specific
      domStorageEnabled={true}
      // Performance
      androidHardwareAccelerationDisabled={false}
      androidLayerType="hardware"
      // Intercept callback
      onNavigationStateChange={(navState) => {
        if (navState.url.includes('yourapp.com/callback')) {
          const url = new URL(navState.url);
          const sessionId = url.searchParams.get('verificationSessionId');
          const status = url.searchParams.get('status');
          onComplete({ sessionId, status });
        }
      }}
    />
  );
};

export default VerificationScreen;

dependencies:
  webview_flutter: ^4.4.0
  webview_flutter_wkwebview: ^3.9.0
  webview_flutter_android: ^3.12.0

import 'package:flutter/material.dart';
import 'package:webview_flutter/webview_flutter.dart';
import 'package:webview_flutter_wkwebview/webview_flutter_wkwebview.dart';
import 'package:webview_flutter_android/webview_flutter_android.dart';

class VerificationScreen extends StatefulWidget {
  final String sessionUrl;
  
  const VerificationScreen({super.key, required this.sessionUrl});

  @override
  State<VerificationScreen> createState() => _VerificationScreenState();
}

class _VerificationScreenState extends State<VerificationScreen> {
  late final WebViewController _controller;

  @override
  void initState() {
    super.initState();
    _setupWebView();
  }

  void _setupWebView() {
    late final PlatformWebViewControllerCreationParams params;
    
    if (WebViewPlatform.instance is WebKitWebViewPlatform) {
      params = WebKitWebViewControllerCreationParams(
        allowsInlineMediaPlayback: true,
        mediaTypesRequiringUserAction: const {},
      );
    } else {
      params = const PlatformWebViewControllerCreationParams();
    }

    _controller = WebViewController.fromPlatformCreationParams(params)
      ..setJavaScriptMode(JavaScriptMode.unrestricted)
      ..setUserAgent(
        'Mozilla/5.0 (Linux; Android 10; Mobile) AppleWebKit/537.36 '
        '(KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36'
      )
      ..setNavigationDelegate(
        NavigationDelegate(
          onNavigationRequest: (NavigationRequest request) {
            if (request.url.contains('yourapp.com/callback')) {
              _handleResult(request.url);
              return NavigationDecision.prevent;
            }
            return NavigationDecision.navigate;
          },
        ),
      )
      ..loadRequest(Uri.parse(widget.sessionUrl));

    // Grant camera/microphone permissions
    final platform = _controller.platform;
    platform.setOnPlatformPermissionRequest((request) {
      request.grant();
    });

    // Android-specific
    if (platform is AndroidWebViewController) {
      platform.setMediaPlaybackRequiresUserGesture(false);
    }
  }

  void _handleResult(String callbackUrl) {
    final uri = Uri.parse(callbackUrl);
    final sessionId = uri.queryParameters['verificationSessionId'];
    final status = uri.queryParameters['status'];
    
    Navigator.of(context).pop({
      'sessionId': sessionId,
      'status': status,
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Identity Verification')),
      body: WebViewWidget(controller: _controller),
    );
  }
}

Mozilla/5.0 (Linux; Android 10; Mobile) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Mobile Safari/537.36

https://yourapp.com/callback?verificationSessionId=abc123&status=Approved