M-Pesa PHP Library

This library provides a simple and flexible way to integrate M-Pesa API services into your PHP application. It supports STK Push, C2B, B2C, transaction status queries, and reversals.

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Features

• STK Push: Initiate Lipa Na M-Pesa Online payments.
• C2B: Handle customer-to-business transactions.
• B2C: Process business-to-customer payments.
• Transaction Status: Query the status of transactions.
• Reversal: Reverse transactions.

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Installation

Install the library via Composer:

composer require apelimpesa/mpesa

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Configuration

Step 1: Copy the Example Environment File

The library includes an .env.example file with all required configuration variables. Copy this file to your project root as .env:

cp vendor/apelimpesa/mpesa/.env.example .env

Step 2: Configure Your Environment Variables

Edit the .env file with your M-Pesa API credentials and settings:

# ==============================================
# M-PESA API CONFIGURATION
# ==============================================

# Application Environment (development/production)
APP_ENV=development

# M-Pesa API Credentials
MPESA_CONSUMER_KEY=your_consumer_key
MPESA_CONSUMER_SECRET=your_consumer_secret
MPESA_SHORTCODE=your_shortcode
MPESA_PASSKEY=your_passkey

# Security Credentials
MPESA_INITIATOR_NAME=your_initiator_name
MPESA_INITIATOR_PASSWORD=your_initiator_password
MPESA_CERTIFICATE_PATH=path/to/your/cert.pem

# ==============================================
# CALLBACK URLS
# ==============================================

# C2B URLs
MPESA_C2B_VALIDATION_URL=https://yourdomain.com/api/c2b/validate
MPESA_C2B_CONFIRMATION_URL=https://yourdomain.com/api/c2b/confirm

# B2C URLs
MPESA_B2C_RESULT_URL=https://yourdomain.com/api/b2c/result
MPESA_B2C_TIMEOUT_URL=https://yourdomain.com/api/b2c/timeout

# Transaction Status URLs
MPESA_TRANSACTION_STATUS_RESULT_URL=https://yourdomain.com/api/status/result
MPESA_TRANSACTION_STATUS_TIMEOUT_URL=https://yourdomain.com/api/status/timeout

# Reversal URLs
MPESA_REVERSAL_RESULT_URL=https://yourdomain.com/api/reversal/result
MPESA_REVERSAL_TIMEOUT_URL=https://yourdomain.com/api/reversal/timeout

Step 3: Required Variables

Variable	Description	Required For
APP_ENV	Application environment (development/production)	All operations
MPESA_CONSUMER_KEY	Your M-Pesa API consumer key	All operations
MPESA_CONSUMER_SECRET	Your M-Pesa API consumer secret	All operations
MPESA_SHORTCODE	Your business shortcode	All operations
MPESA_PASSKEY	Your Lipa Na M-Pesa Online passkey	STK Push
MPESA_INITIATOR_NAME	B2C/B2B transaction initiator name	B2C/B2B
MPESA_INITIATOR_PASSWORD	Encrypted initiator password	B2C/B2B
MPESA_CERTIFICATE_PATH	Path to your M-Pesa certificate (if required)	Optional for security

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Usage

Step 1: Load Environment Variables

Ensure your application loads the .env file. For non-Laravel projects, use vlucas/phpdotenv:

require_once __DIR__.'/vendor/autoload.php';

$dotenv = Dotenv\Dotenv::createImmutable(__DIR__);
$dotenv->load();

Step 2: Initialize the Library

Create an instance of the M-Pesa service:

use ApeliMpesa\Mpesa\Mpesa;

$mpesa = new Mpesa([
    'consumer_key' => getenv('MPESA_CONSUMER_KEY'),
    'consumer_secret' => getenv('MPESA_CONSUMER_SECRET'),
    'shortcode' => getenv('MPESA_SHORTCODE'),
    'passkey' => getenv('MPESA_PASSKEY'),
    'environment' => getenv('APP_ENV'), // 'development' or 'production'
]);

Step 3: Perform Transactions

1. STK Push (Lipa Na M-Pesa Online)

$response = $mpesa->stkPush([
    'amount' => 100,
    'phone' => '+254712345678',
    'reference' => 'Order123',
    'description' => 'Payment for Order123',
    'callback_url' => 'https://yourdomain.com/api/stk/callback',
]);

if ($response->isSuccessful()) {
    echo "STK Push initiated successfully. CheckoutRequestID: " . $response->getCheckoutRequestID();
} else {
    echo "Error: " . $response->getErrorMessage();
}

2. Query Transaction Status

$response = $mpesa->queryTransactionStatus('CheckoutRequestID123');

if ($response->isSuccessful()) {
    echo "Transaction completed successfully.";
} else {
    echo "Error: " . $response->getErrorMessage();
}

3. Reverse a Transaction

$response = $mpesa->reverseTransaction([
    'transaction_id' => 'TransactionID123',
    'amount' => 100,
    'receiver' => '600000',
    'receiver_type' => 'Paybill',
    'callback_url' => 'https://yourdomain.com/api/reversal/callback',
]);

if ($response->isSuccessful()) {
    echo "Transaction reversed successfully.";
} else {
    echo "Error: " . $response->getErrorMessage();
}

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Testing with Sandbox

When APP_ENV=development, the library uses M-Pesa's sandbox environment. No real money is transferred during testing.

For production, set:

APP_ENV=production

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Security Notes

• Use different credentials for development and production environments.
• Keep your .env file secure and avoid committing it to version control.

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Requirements

• PHP 7.4 or higher
• Composer
• cURL extension enabled

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License

This library is open-source and available under the MIT License.