在Flutter应用中集成Paypal支付

dependencies:
  paypal_sdk: ^2.0.0

import 'package:paypal_sdk/paypal_sdk.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('PayPal Integration')),
        body: PayPalScreen(),
      ),
    );
  }
}

import 'package:paypal_sdk/paypal_sdk.dart';

class PayPalScreen extends StatefulWidget {
  @override
  _PayPalScreenState createState() => _PayPalScreenState();
}

class _PayPalScreenState extends State<PayPalScreen> {
  final PayPalConfiguration _config = PayPalConfiguration(
    clientId: 'YOUR_CLIENT_ID',
    environment: PayPalEnvironment.sandbox,
  );

  void _pay() async {
    PayPalPayment payment = PayPalPayment(
      amount: PayPalAmount(
        currencyCode: 'USD',
        value: '10.00',
      ),
      shortDescription: 'Test Payment',
      intent: PayPalPaymentIntent.sale,
    );

    PayPalPaymentConfirmation confirmation = await PayPalSDK.instance.initiatePayment(payment, _config);
    if (confirmation.isSuccessful) {
      // Handle successful payment
    } else {
      // Handle failed payment
    }
  }

  @override
  Widget build(BuildContext context) {
    return Center(
      child: ElevatedButton(
        onPressed: _pay,
        child: Text('Pay with PayPal'),
      ),
    );
  }
}