flutter_google_pay 0.1.4

Porting of Google Pay (a digital wallet platform and online payment system) to Flutter.

example/lib/main.dart

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

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

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

class _MyAppState extends State<MyApp> {
  BuildContext scaffoldContext;

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

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

    if (!(await FlutterGooglePay.isAvailable(environment))) {
      _showToast(scaffoldContext, 'Google pay not available');
    } else {
      PaymentItem pm = PaymentItem(
          stripeToken: 'pk_test_1IV5H8NyhgGYOeK6vYV3Qw8f',
          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());
      });
    }
  }

  _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
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
          appBar: AppBar(
            title: const Text('Plugin example app'),
          ),
          body: Builder(builder: (context) {
            scaffoldContext = context;
            return Center(
                child: Column(
              children: <Widget>[
                FlatButton(
                  onPressed: _makeStripePayment,
                  child: Text('Stripe pay'),
                ),
                FlatButton(
                  onPressed: _makeCustomPayment,
                  child: Text('Custom pay'),
                ),
              ],
            ));
          })),
    );
  }

  void _showToast(BuildContext context, String message) {
    final scaffold = Scaffold.of(context);
    scaffold.showSnackBar(SnackBar(
      content: Text(message),
      action: SnackBarAction(
        label: 'UNDO',
        onPressed: () {},
      ),
    ));
  }
}