适用于 Google Pay 的 Flutter 应用内购买工具

Question

我正在尝试使用 Flutter Dart 从 Android Java 更新 Google Play 商店上的现有应用程序。在我现有的应用程序中，我有一个使用 google pay 的应用内购买，它工作得很好（使用 android java 编码），但我正在寻找如何使用 flutter dart 实现 google pay 应用内购买。

Answer 1

我发现GooglePay不是支付网关，而是网关的阶梯，因此您必须将支付网关系统与google集成，从列表中我推荐STRIPE。我将在下面解释。

我遇到了两个。实现这一目标的选项。

1. Google Pay 插件 - 自动使用 STRIPE 支付网关。
2. Flutter Google Pay - 您可以使用多个自定义支付网关。

要求

确保您已设置 Stripe 帐户 - 如果您尚未访问 Stripe Payment Gateway 来设置您的帐户

第一个插件Google Pay插件 确保使用您的条带支付密钥初始化插件

GooglePay.initializeGooglePay("pk_test_H5CJvRiPfCrRS44bZJLu46fM00UjQ0vtRN");

这个插件的代码结构是这样的。

import 'package:flutter/material.dart';
import 'dart:async';
import 'package:flutter/services.dart';
import 'package:google_pay/google_pay.dart';

void main() => runApp(MyApp());


class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  String _platformVersion = 'Unknown';
  String _googlePayToken = 'Unknown';

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

  // Platform messages are asynchronous, so we initialize in an async method.
  Future<void> initPlatformState() async {
    String platformVersion;
    // Platform messages may fail, so we use a try/catch PlatformException.
    try {
      platformVersion = await GooglePay.platformVersion;
    } on PlatformException {
      platformVersion = 'Failed to get platform version.';
    }

    await GooglePay.initializeGooglePay("pk_test_H5CJvRiPfCrRS44bZJLu46fM00UjQ0vtRN");

    // If the widget was removed from the tree while the asynchronous platform
    // message was in flight, we want to discard the reply rather than calling
    // setState to update our non-existent appearance.
    if (!mounted) return;

    setState(() {
      _platformVersion = platformVersion;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Plugin example app'),
        ),
        body: Center(
          child: Column(
            children: <Widget>[
              Text('Running on: $_platformVersion\n'),
              Text('Google pay token: $_googlePayToken\n'),
              FlatButton(
                child: Text("Google Pay Button"),
                onPressed: onButtonPressed,
              )
          ]    
          ),
        ),
      ),
    );
  }

  void onButtonPressed() async{
    setState((){_googlePayToken = "Fetching";});
    try {
      await GooglePay.openGooglePaySetup(
          price: "5.0",
          onGooglePaySuccess: onSuccess,
          onGooglePayFailure: onFailure,
          onGooglePayCanceled: onCancelled);
      setState((){_googlePayToken = "Done Fetching";});
    } on PlatformException catch (ex) {
      setState((){_googlePayToken = "Failed Fetching";});
    }
    
  }

  void onSuccess(String token){ 
    setState((){_googlePayToken = token;});
  }

  void onFailure(){ 
    setState((){_googlePayToken = "Failure";});
  }

  void onCancelled(){ 
    setState((){_googlePayToken = "Cancelled";});
  }
}

第二个插件Flutter Google Pay利用其他支付网关

您可以在此处查看列表支付网关

这个插件有两种初始化方法 - 使用 stripe 或其他网关

对于 Stripe，请使用此方法并使用您的 Stripe 密钥进行初始化 _makeStripePayment() 异步 { var 环境 = '休息'; // 或“生产”

      if (!(await FlutterGooglePay.isAvailable(environment))) {
        _showToast(scaffoldContext, 'Google pay not available');
      } else {
        PaymentItem pm = PaymentItem(
            stripeToken: 'pk_test_1IV5H8NyhgGYOeK6vYV3Qw8f',// stripe public key
            stripeVersion: "2018-11-08",
            currencyCode: "usd",
            amount: "0.10",
            gateway: 'stripe');

        FlutterGooglePay.makePayment(pm).then((Result result) {
          if (result.status == ResultStatus.SUCCESS) {
            _showToast(scaffoldContext, 'Success');
          }
        }).catchError((dynamic error) {
          _showToast(scaffoldContext, error.toString());
        });
      }
    }

对于其他支付网关

 _makeCustomPayment() async {
      var environment = 'rest'; // or 'production'

      if (!(await FlutterGooglePay.isAvailable(environment))) {
        _showToast(scaffoldContext, 'Google pay not available');
      } else {
        ///docs https://developers.google.com/pay/api/android/guides/tutorial
        PaymentBuilder pb = PaymentBuilder()
          ..addGateway("example")
          ..addTransactionInfo("1.0", "USD")
          ..addAllowedCardAuthMethods(["PAN_ONLY", "CRYPTOGRAM_3DS"])
          ..addAllowedCardNetworks(
              ["AMEX", "DISCOVER", "JCB", "MASTERCARD", "VISA"])
          ..addBillingAddressRequired(true)
          ..addPhoneNumberRequired(true)
          ..addShippingAddressRequired(true)
          ..addShippingSupportedCountries(["US", "GB"])
          ..addMerchantInfo("Example");

        FlutterGooglePay.makeCustomPayment(pb.build()).then((Result result) {
          if (result.status == ResultStatus.SUCCESS) {
            _showToast(scaffoldContext, 'Success');
          } else if (result.error != null) {
            _showToast(context, result.error);
          }
        }).catchError((error) {
          //TODO
        });
      }
    }

Answer 2

您在应用程序内使用 g pay 应该没有问题。无需为此编写特定代码。您只需确保在 Google 结算平台中设置您的商家即可。查看本教程 https://medium.com/flutter-community/in-app-purchases-with-flutter-a-compressive-step-by-step-tutorial-b96065d79a21