Paystack PHP SDK

A modern, developer-friendly PHP SDK for the Paystack API. This library provides convenient access to Paystack's payment infrastructure from applications written in PHP. It includes a comprehensive set of classes for all API resources with full type safety and automatic parameter validation.

Features

• ✅ Complete API Coverage - All Paystack API endpoints supported
• ✅ Type Safety - Full PHP 8.2+ type declarations
• ✅ Parameter Validation - Automatic validation of API parameters
• ✅ PSR-18 HTTP Client - Compatible with any PSR-18 HTTP client
• ✅ Comprehensive Examples - Detailed usage examples for all features
• ✅ Exception Handling - Detailed error responses and exception handling
• ✅ Modern PHP - Built for PHP 8.2+ with modern coding standards

Quick Links

• Getting Started Guide
• API Reference
• Examples
• Advanced Usage
• Troubleshooting
• Upgrade Guide (v1.x → v2.x)

Table of Contents

• Requirements
• Installation
• Authentication
• Quick Start
• Available Resources
• Usage Examples
  • Transactions
  • Customers
  • Payment Requests
  • Subscriptions
• Error Handling
• Testing
• Contributing
• Support

Requirements

• PHP 8.2 or higher
• PSR-18 HTTP Client (any implementation)
• Composer for dependency management

Installation

Using Composer

Install the SDK using Composer:

composer require starfolksoftware/paystack-php

Install HTTP Client

This package requires a PSR-18 HTTP client. If you don't have one installed, we recommend Guzzle:

composer require php-http/guzzle7-adapter

Alternatively, you can use any PSR-18 compatible client:

# Symfony HTTP Client
composer require symfony/http-client

# cURL client
composer require php-http/curl-client

# Mock client (for testing)
composer require php-http/mock-client

Autoloading

Include Composer's autoloader in your project:

<?php
require_once 'vendor/autoload.php';

Authentication

Get your API keys from your Paystack Dashboard:

• Test Secret Key: sk_test_... (for development)
• Live Secret Key: sk_live_... (for production)

⚠️ Important: Never expose your secret key in client-side code or public repositories.

Quick Start

<?php
require_once 'vendor/autoload.php';

use StarfolkSoftware\Paystack\Client as PaystackClient;

// Initialize the client
$paystack = new PaystackClient([
    'secretKey' => 'sk_test_your_secret_key_here',
]);

// List all transactions
$transactions = $paystack->transactions->all([
    'perPage' => 50,
    'page' => 1
]);

echo "Total transactions: " . $transactions['meta']['total'] . "\n";

// Create a customer
$customer = $paystack->customers->create([
    'email' => 'customer@example.com',
    'first_name' => 'John',
    'last_name' => 'Doe',
    'phone' => '+2348123456789'
]);

echo "Customer created: " . $customer['data']['customer_code'] . "\n";

Payment Requests

// Create a payment request
$paymentRequest = $paystack->paymentRequests->create([
    'description' => 'Website Development Invoice',
    'line_items' => [
        ['name' => 'Frontend Development', 'amount' => 50000, 'quantity' => 1],
        ['name' => 'Backend Development', 'amount' => 75000, 'quantity' => 1],
        ['name' => 'UI/UX Design', 'amount' => 25000, 'quantity' => 1]
    ],
    'tax' => [
        ['name' => 'VAT', 'amount' => 11250] // 7.5% of total
    ],
    'customer' => 'customer@example.com',
    'due_date' => date('Y-m-d', strtotime('+30 days')),
    'send_notification' => true
]);

// List payment requests
$paymentRequests = $paystack->paymentRequests->all([
    'perPage' => 20,
    'page' => 1,
    'status' => 'pending'
]);

// Fetch specific payment request
$paymentRequest = $paystack->paymentRequests->fetch('PRQ_1weqqsn2wwzgft8');

// Update payment request
$updated = $paystack->paymentRequests->update('PRQ_1weqqsn2wwzgft8', [
    'description' => 'Updated Website Development Invoice',
    'due_date' => date('Y-m-d', strtotime('+45 days'))
]);

// Send reminder notification
$notification = $paystack->paymentRequests->sendNotification('PRQ_1weqqsn2wwzgft8');

Subscriptions

// Create a plan
$plan = $paystack->plans->create([
    'name' => 'Premium Monthly',
    'interval' => 'monthly',
    'amount' => 5000, // ₦50.00 per month
    'currency' => 'NGN',
    'description' => 'Premium subscription with all features'
]);

// Create subscription
$subscription = $paystack->subscriptions->create([
    'customer' => 'CUS_xwaj0txjryg393b',
    'plan' => $plan['data']['plan_code'],
    'authorization' => 'AUTH_authorization_code'
]);

// List subscriptions
$subscriptions = $paystack->subscriptions->all([
    'perPage' => 50,
    'plan' => $plan['data']['plan_code']
]);

// Disable subscription
$disabled = $paystack->subscriptions->disable('SUB_subscription_code', [
    'code' => 'SUB_subscription_code',
    'token' => 'subscription_email_token'
]);

Error Handling

The SDK provides comprehensive error handling with detailed error messages:

use StarfolkSoftware\Paystack\Client as PaystackClient;

try {
    $paystack = new PaystackClient([
        'secretKey' => 'sk_test_your_secret_key_here',
    ]);
    
    $transaction = $paystack->transactions->initialize([
        'email' => 'invalid-email', // This will cause an error
        'amount' => 20000
    ]);
    
} catch (\Psr\Http\Client\ClientExceptionInterface $e) {
    // Network or HTTP-related errors
    echo "HTTP Error: " . $e->getMessage() . "\n";
    
} catch (\Exception $e) {
    // General errors
    echo "Error: " . $e->getMessage() . "\n";
}

// Handle API response errors
$response = $paystack->transactions->verify('invalid_reference');
if (!$response['status']) {
    echo "API Error: " . $response['message'] . "\n";
    // Handle the error appropriately
}

Configuration Options

You can customize the client behavior with various configuration options:

$paystack = new PaystackClient([
    'secretKey' => 'sk_test_your_secret_key_here',
    'apiVersion' => 'v1', // API version (default: v1)
    'baseUri' => 'https://api.paystack.co', // Custom base URI
]);

// Access the underlying HTTP client if needed
$httpClient = $paystack->getHttpClient();

Webhook Handling

// In your webhook endpoint
$payload = file_get_contents('php://input');
$signature = $_SERVER['HTTP_X_PAYSTACK_SIGNATURE'] ?? '';

// Verify webhook signature
$secretKey = 'sk_test_your_secret_key_here';
$computedSignature = hash_hmac('sha512', $payload, $secretKey);

if (hash_equals($signature, $computedSignature)) {
    $event = json_decode($payload, true);
    
    switch ($event['event']) {
        case 'charge.success':
            // Handle successful payment
            $reference = $event['data']['reference'];
            echo "Payment successful: {$reference}\n";
            break;
            
        case 'subscription.create':
            // Handle new subscription
            $subscriptionCode = $event['data']['subscription_code'];
            echo "New subscription: {$subscriptionCode}\n";
            break;
            
        default:
            echo "Unhandled event: {$event['event']}\n";
    }
} else {
    echo "Invalid signature\n";
    http_response_code(400);
}

Testing

Run the test suite using PHPUnit:

# Install development dependencies
composer install --dev

# Run all tests
composer test

# Run tests with coverage
./vendor/bin/phpunit --coverage-html coverage

# Run specific test class
./vendor/bin/phpunit tests/TransactionTest.php

# Run tests with verbose output
./vendor/bin/phpunit --testdox

Testing Your Integration

Use Paystack's test mode to test your integration:

// Use test secret key
$paystack = new PaystackClient([
    'secretKey' => 'sk_test_your_test_secret_key_here',
]);

// Test card numbers for different scenarios
$testCards = [
    'success' => '4084084084084081',
    'insufficient_funds' => '4084084084084107',
    'invalid_pin' => '4084084084084099'
];

Contributing

We welcome contributions! Please see our Contributing Guide for details.

Development Setup

# Clone the repository
git clone https://github.com/starfolksoftware/paystack-php.git
cd paystack-php

# Install dependencies
composer install

# Run tests
composer test

Coding Standards

This project follows PSR-12 coding standards. Please ensure your code adheres to these standards:

# Check code style (if you have PHP_CodeSniffer installed)
phpcs src/ --standard=PSR12

# Fix code style automatically
phpcbf src/ --standard=PSR12

Support

• Documentation: API Reference | Getting Started
• Examples: Check the examples directory
• Issues: GitHub Issues
• Email: contact@starfolksoftware.com
• Paystack Documentation: Official API Docs

Changelog

Please see CHANGELOG for more information on what has changed recently.

Security Vulnerabilities

If you discover a security vulnerability, please send an email to contact@starfolksoftware.com. All security vulnerabilities will be promptly addressed.

License

The MIT License (MIT). Please see License File for more information.

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Made with ❤️ by Starfolk Software