Copyright (C) 2026 iTechie 360

A custom M-Pesa STK Push payment gateway plugin for WooCommerce by iTechie 360.

Software Engineer | Jesse Jim

• GitHub (https://github.com/IAmJesseJim)
• Portfolio (https://iamjessejim.vercel.app)

Allows customers to make secure payments via Safaricom M-Pesa directly from WooCommerce checkout using STK Push.

Features

• WooCommerce payment gateway integration
• M-Pesa STK Push checkout
• Customer phone number collection
• Sandbox and Production support
• Automatic payment callback handling
• Automatic order status updates
• Secure Daraja API authentication
• Admin configuration dashboard
• Stock reduction after successful payment

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Requirements

Before installation, ensure your server has:

• WordPress 6.0+
• WooCommerce installed and activated
• PHP 7.4+
• SSL certificate (required for production)
• Safaricom Daraja API credentials

You must have:

• Consumer Key
• Consumer Secret
• Business Shortcode
• Passkey

Get credentials from:

https://developer.safaricom.co.ke

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Installation

Method 1: Upload ZIP

1. Compress plugin folder:

woocommerce-mpesa-stk-push-payment-gateway.zip

2. Login to WordPress Admin

3. Go to:

Plugins → Add New → Upload Plugin

4. Upload ZIP

5. Activate plugin

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Method 2: Manual Upload

Upload plugin folder to:

/wp-content/plugins/woocommerce-mpesa-stk-push-payment-gateway/

Then activate from:

WordPress Admin → Plugins

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IMPORTANT INSTALL ORDER

Install in this exact order:

Step 1

Install WordPress

Step 2

Install and activate WooCommerce

Step 3

Complete WooCommerce setup wizard

Step 4

Install and activate woocommerce-mpesa-stk-push-payment-gateway

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If Website Crashes After Activation

This usually means WooCommerce is missing or inactive.

Symptoms:

• White screen
• Admin dashboard inaccessible
• Frontend broken
• Fatal PHP errors

Fix:

Login to cPanel or File Manager

Delete:

/wp-content/plugins/woocommerce-mpesa-stk-push-payment-gateway/

Then:

1. Install WooCommerce
2. Activate WooCommerce
3. Reinstall woocommerce-mpesa-stk-push-payment-gateway

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Configuration

Go to:

WooCommerce → Settings → Payments → woocommerce-mpesa-stk-push-payment-gateway

Enable:

• Enable Gateway

Enter:

• Consumer Key
• Consumer Secret
• Business Shortcode
• Passkey

Choose environment:

• Sandbox
• Production

Save changes

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Sandbox Testing

Use Safaricom sandbox credentials.

Test number format:

2547XXXXXXXX

Example:

254712345678

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Production Setup

Before going live:

• Switch environment to Production
• Replace sandbox credentials
• Set valid callback URL
• Enable HTTPS

Callback URL:

https://yourdomain.com/wc-api/mpesa_callback/

Register callback with Safaricom.

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How Payments Work

1. Customer selects woocommerce-mpesa-stk-push-payment-gateway
2. Enters M-Pesa phone number
3. Clicks Place Order
4. STK Push sent to phone
5. Customer enters PIN
6. Safaricom confirms payment
7. WooCommerce marks order complete

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File Structure

woocommerce-mpesa-stk-push-payment-gateway/
│
├── woocommerce_mpesa.php
├── README.md
└── assets/
    └── mpesa-logo.png
    └── og-image.png

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Security Notes

This plugin:

• Sanitizes phone inputs
• Uses OAuth access tokens
• Uses secure API requests
• Stores checkout request IDs for verification

Never expose:

• Consumer Secret
• Passkey

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Troubleshooting

"Could not connect to M-Pesa"

Possible causes:

• Invalid credentials
• Safaricom API downtime
• Wrong environment selected

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STK Push not received

Check:

• Phone format is 2547XXXXXXXX
• Daraja app is approved
• Shortcode is active

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Payment succeeds but order not updated

Check callback URL accessibility.

Test:

https://yourdomain.com/wc-api/mpesa_callback/

Should return:

{"ResultCode":0,"ResultDesc":"Accepted"}

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Developer Fix (Critical)

Add this to avoid WooCommerce dependency crash:

if (!class_exists('WC_Payment_Gateway')) {
    return;
}

Inside:

init_my_mpesa_gateway()

This prevents fatal errors when WooCommerce is missing.

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Author

iTechie 360

Website:

https://www.itechie360.com

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License

MIT License

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Version

1.0.0

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Support

For support:

itechie360@gmail.com