payengine 2.1.0-alpha.1

The PayEngine Flutter SDK allows you to build delightful payment experiences in your native Android and iOS apps using Flutter

example/lib/main.dart

import 'dart:convert';

import 'package:flutter/material.dart';

import 'package:http/http.dart' as http;

import 'package:payengine/payengine.dart';
import 'package:payengine/payengine_provider.dart';
import 'package:payengine_example/config.dart';
import 'package:payengine_example/screens/credit_card_screen.dart';
import 'package:payengine_example/themes.dart';

void main() {
  runApp(
    PayEngineProvider(
      config: Config.config, 
      child: const MyApp()
    )
  );
}

class MyApp extends StatefulWidget {
  const MyApp({super.key});

  @override
  State<MyApp> createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> with TickerProviderStateMixin {
  Map<dynamic, dynamic> result = {};

  @override
  void initState() {
    super.initState();
    // Set the fetch access token callback in the Flutter plugin
    PayEngineNative.setFetchAccessTokenCallback(_fetchAccessToken);
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: MyAppThemes.lightTheme,
      darkTheme: MyAppThemes.darkTheme,
      themeMode: ThemeMode.light,
      home: const CreditCardScreen(),
    );
  }
}

// Function to fetch the access token
Future<PEAccessTokenJson> _fetchAccessToken() async {
  final String baseUrl = Config.config.baseURL;
  final String merchantId = Config.merchantId;
  final String apiKey = Config.privateKey;

  final Uri url = Uri.parse("$baseUrl/api/merchant/$merchantId/sessions");

  final Map<String, dynamic> requestBody = {
    "expires_in": 900, // Token valid for 15 minutes
  };

  final http.Response response;
  try {
    response = await http.post(
      url,
      headers: {
        "Content-Type": "application/json",
        "Authorization": "Basic $apiKey",
      },
      body: jsonEncode(requestBody),
    );
  } catch (e) {
    throw Exception("Network request failed: $e");
  }

  if (response.statusCode != 200) {
    throw Exception("HTTP Error: ${response.statusCode}");
  }

  final Map<String, dynamic> responseData = jsonDecode(response.body);

  if (responseData["error"] == true) {
    throw Exception("API Error: ${responseData["message"]}");
  }

  return AccessTokenImpl(
    accessToken: responseData["access_token"],
    expiresIn: responseData["expires_in"],
  );
}

class AccessTokenImpl extends PEAccessToken with PEAccessTokenJson {
  @override
  final String accessToken;
  @override
  final int expiresIn;

  AccessTokenImpl({required this.accessToken, required this.expiresIn});
}