Paystack Gateway Payment

A Flutter package that integrates the Paystack payment gateway to facilitate online transactions. It provides easy-to-use services for initializing and verifying payments, along with a customizable button widget for triggering payments in your Flutter app.

Features

Initialize payments securely using Paystack API.
Verify transaction status.
Customizable Paystack payment button.
WebView to handle Paystack payment flow.

Installation

Add the following dependency to your pubspec.yaml file:

dependencies:
  paystack_gateway_payment: ^1.0.0

Then run:

flutter pub get

Usage

1. Set up Paystack Service To initialize the Paystack service, you need to provide your Paystack secret key:

import 'package:paystack_gateway_payment/services/paystack_service.dart';

final paystackService = PaystackService(secretKey: 'your-paystack-secret-key');

1. Initialize Transaction To initialize a payment, call the initializeTransaction method with necessary parameters:

PaystackResponse response = await paystackService.initializeTransaction(
  email: 'user@example.com',
  amount: 1000,
  callbackUrl: 'https://your-callback-url.com',
);

This will return a PaystackResponse with the transaction details, including an authorization URL to complete the payment.

1. Payment Button Use the PaystackButton widget to provide a payment button in your app:

import 'package:paystack_gateway_payment/widgets/paystack_button.dart';

PaystackButton(
  paystackService: paystackService,
  email: 'user@example.com',
  amount: 1000,
  callbackUrl: 'https://your-callback-url.com',
  onSuccess: (reference) {
    print('Payment successful: $reference');
  },
  onError: (error) {
    print('Payment error: $error');
  },
)

1. WebView for Payment Flow The package includes a PaystackWebView that handles the Paystack payment process:

import 'package:paystack_gateway_payment/paystack_webview.dart';

// Navigate to the WebView page with the authorization URL
Navigator.push(
  context,
  MaterialPageRoute(
    builder: (context) => PaystackWebView(
      authorizationUrl: response.data['authorization_url'],
      onSuccess: () {
        print('Payment successful');
      },
      onError: (error) {
        print('Payment failed: $error');
      },
    ),
  ),
);

Error Handling

The package includes custom exceptions for error handling. If a transaction fails or there's an invalid parameter, it will throw a PaystackException with a relevant message.

Example:

try {
  // Some payment-related operation
} catch (e) {
  if (e is PaystackException) {
    print('Error: ${e.message}');
  }
}

License

This package is licensed under the MIT License. See the LICENSE file for more details.

Contributing

Feel free to fork the repository and submit issues or pull requests. Contributions are welcome!

Contact

For support or inquiries, please reach out to highverticaltechnologies@gmail.com.


### Key Sections:
1. **Overview**: A brief description of what the package does.
2. **Installation**: Instructions on how to add the package to a Flutter project.
3. **Usage**: Examples of how to use the package, including initializing transactions, using the `PaystackButton`, and handling the payment flow with `PaystackWebView`.
4. **Error Handling**: Explanation of how to catch and handle exceptions.
5. **License**: Information about the package’s license (you can adjust this based on your chosen license).

You can customize the "License" and "Contact" sections based on your needs.

9bb0b79 (Initial commit)