如何使用Flutter Webview插件实现PayPal支付网关

dependencies:
  flutter_webview_plugin: ^0.4.0

import 'package:flutter/material.dart';
import 'package:flutter_webview_plugin/flutter_webview_plugin.dart';

class PayPalPaymentPage extends StatelessWidget {
  final String paypalPaymentUrl;

  PayPalPaymentPage({required this.paypalPaymentUrl});

  @override
  Widget build(BuildContext context) {
    return WebviewScaffold(
      url: paypalPaymentUrl,
      appBar: AppBar(
        title: Text('PayPal Payment'),
      ),
    );
  }
}

Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) => PayPalPaymentPage(
      paypalPaymentUrl: 'https://www.paypal.com/payment',
    ),
  ),
);