flutter_paydemo/lib/service/pay_service.dart

import 'package:fluwx/fluwx.dart' as fluwx;
// import 'package:flutter_alipay/flutter_alipay.dart';
// import 'package:stripe_payment/stripe_payment.dart';

import 'package:flutter_paydemo/models/payment.dart';

class PayService {
  PayService._();

  /// 发起微信支付
  Future<WechatPaymentCreatedResponse> createWechatPayment({
    required String productId,
    String? source,
  }) async {
    return sendPostRequest(
      '/v1/payment/wechatpay/',
      (resp) {
        return WechatPaymentCreatedResponse.fromJson(resp.data);
      },
      formData: {
        'product_id': productId,
        'source': source,
      },
    );
  }

  void wechatPay(PaymentProduct product) async {
    bool isInstalled = await fluwx.isWeChatAppInstalled();
    try {
      final created = await APIServer().createWechatPayment(
        productId: product.id,
        source: paymentSource(),
      );
      paymentId = created.paymentId;

      if (PlatformTool.isAndroid() || PlatformTool.isIOS()) {
        await fluwx.payWithWeChat(
          appId: created.appId!,
          partnerId: created.partnerId!,
          prepayId: created.prepayId!,
          packageValue: created.package!,
          nonceStr: created.noncestr!,
          timeStamp: int.parse(created.timestamp!),
          sign: created.sign!,
        );
      } else {
        openDialog(
          // ignore: use_build_context_synchronously
          context,
          builder: Builder(builder: (context) {
            return Container(
              alignment: Alignment.center,
              height: 250,
              width: 220,
              margin: const EdgeInsets.only(top: 20),
              child: Column(
                children: [
                  ClipRRect(
                    borderRadius: BorderRadius.circular(8),
                    child: QrImageView(
                      data: created.codeUrl!,
                      version: QrVersions.auto,
                      size: 200,
                      backgroundColor: Colors.white,
                    ),
                  ),
                  const SizedBox(height: 10),
                  const Text(
                    '请使用微信扫码支付',
                    style: TextStyle(
                      fontSize: 14,
                    ),
                  ),
                ],
              ),
            );
          }),
          onSubmit: () {
            _startPaymentLoading();
            APIServer().queryPaymentStatus(created.paymentId).then((resp) {
              if (resp.success) {
                showSuccessMessage(resp.note ?? '支付成功');
                _closePaymentLoading();
              } else {
                // 支付失败，延迟 5s 再次查询支付状态
                Future.delayed(const Duration(seconds: 5), () async {
                  try {
                    final value =
                        await APIServer().queryPaymentStatus(created.paymentId);

                    if (value.success) {
                      showSuccessMessage(value.note ?? '支付成功');
                    } else {
                      showErrorMessage('支付未完成，我们接收到的状态为：${value.note}');
                    }
                  } catch (e) {
                    // ignore: use_build_context_synchronously
                    showErrorMessage(resolveError(context, e));
                  } finally {
                    _closePaymentLoading();
                  }
                });
              }
            });

            return true;
          },
          confirmText: '已完成支付',
          barrierDismissible: false,
        );
      }
    } on Exception catch (e) {
      // ignore: use_build_context_synchronously
      showErrorMessageEnhanced(context, e);
    } finally {
      _closePaymentLoading();
    }
  }

  void alipay() async {
    String orderString = 'your_order_string'; // 从服务器获取
    // var result = await FlutterAlipay.pay(orderString);
  }

  void stripe() async {
    // var token = await StripePayment.paymentRequestWithCardForm(
    //     CardFormPaymentRequest());
    // 发送 token 到服务器进行支付处理
  }

  Future<WechatPaymentCreatedResponse> sendPostRequest(
      String s, WechatPaymentCreatedResponse Function(dynamic resp) param1,
      {required Map<String, String?> formData}) {}
}