ExpressPay Payment Module

Express Pay Payment Module is a WordPress plugin that integrates your website with Express Pay service, allowing you to accept payments through ERIP, bank cards, and E-POS methods.

The plugin adds a payment form to your site using a shortcode and provides payment method settings and invoice management through the WordPress admin panel in the Express Payments menu.

Features

• Add multiple payment methods in admin panel (ERIP, card, E-POS types)
• Display payment form on site using shortcode with customizable amount and payment description
• Generate invoice parameters and signatures (HMAC-SHA1) for Express Pay API v1
• Test mode support using sandbox environment and test credentials
• Incoming notification signature verification
• Allow customers to modify name, address, and amount during payment (optional)
• Send notifications to customers via email/SMS (optional)
• Display QR code for ERIP/E-POS payments
• Invoice list and payment status management in admin panel
• Support for multiple payment methods on one site

Database Tables

The plugin creates and uses the following WordPress database tables:
* {$wpdb->prefix}expresspay_options — payment methods and their parameters
* {$wpdb->prefix}expresspay_invoices — created invoices and their statuses

Notification Endpoint

For receiving payment notifications, the plugin uses WordPress AJAX endpoint:
/wp-admin/admin-ajax.php?action=receive_notification&type_id=

Configuration

1. Go to WordPress admin panel → Express Payments → Settings
2. Add a new payment method by clicking “Add Payment Method”
3. Configure the following parameters:

General Settings

• Name — Display name of payment method (e.g., “ExpressPay (ERIP)”)
• Type — Payment method type: erip, card, or epos
• Token — API access token from Express Pay service
• Service ID — Service number in Express Pay system
• Secret Word — Secret key for signing payment requests
• Secret Word for Notification — Secret key for verifying incoming notifications

API URLs

• API URL — Production API base URL (e.g., https://api.express-pay.by/v1/)
• Sandbox URL — Sandbox API base URL (e.g., https://sandbox-api.express-pay.by/v1/)
• Test Mode — Enable/disable sandbox mode for testing

Payment Options

• ERIP Path — Path in ERIP tree shown to users
• Show QR Code — Display QR code for ERIP/E-POS payments
• Use Signature for Notification — Verify incoming notification signatures
• Can Change Name — Allow customers to modify name during payment
• Can Change Address — Allow customers to modify address during payment
• Can Change Amount — Allow customers to modify amount during payment
• Send Email — Send payment notifications via email
• Send SMS — Send payment notifications via SMS

E-POS Settings

• Service Provider Code — E-POS provider code
• Service E-POS Code — E-POS service code

Usage

Adding Payment Form to Page

Create or edit a page and add the payment form shortcode:

[expresspay_payment amount=25.5 edit_amount=true info="Payment description"]

Shortcode Parameters

• amount — Payment amount (e.g., 25.5)
• edit_amount — Allow customer to change amount (e.g., true or false)
• info — Payment description/purpose
• method_id — Specific payment method ID (optional, shows all if not specified)

Payment Flow

1. Customer visits page with payment form
2. Customer selects payment method and enters details
3. Customer submits payment
4. Plugin generates invoice parameters and signature
5. Customer is redirected to Express Pay service for payment
6. After successful payment, customer is returned to the page
7. Plugin verifies payment signature and marks invoice as paid
8. Express Pay server sends additional notification webhook

Testing in Sandbox Mode

1. Enable Test Mode in payment method settings
2. Verify that Sandbox URL is being used
3. Complete test payment through Express Pay sandbox environment

Requirements

• WordPress 4.0 or higher
• PHP 5.6 or higher
• Outgoing HTTPS access to Express Pay API:
  • Production: https://api.express-pay.by/v1/
  • Sandbox: https://sandbox-api.express-pay.by/v1/
• Public URL accessibility for receiving webhooks (if site is behind firewall or requires authentication, webhooks will not be delivered)

Support

For installation and configuration instructions, visit:
Express Pay CMS Extensions

Watch video tutorials on our YouTube channel:
Express Pay YouTube

License

This plugin code and documentation is proprietary and provided by Express Pay service.
All rights reserved. Please refer to LICENSE file in plugin directory for details.

Third-Party Services

This plugin connects to Express Pay service for payment processing:
* Service URL: https://express-pay.by/
* API Documentation: https://express-pay.by/docs/api/v1
* Privacy Policy: https://express-pay.by/docs

By using this plugin, you agree to Express Pay Terms of Service.