WooCommerce Development

Chapter 5: Payment Gateway Integration

5.1 Payment Methods

Configure payment gateways for accepting payments.

Built-in Payment Methods:

• PayPal - Popular payment gateway
• Stripe - Credit card processing
• Bank transfer - Direct bank transfers
• Cash on delivery - Pay on delivery
• Check payments - Check payments
• BACS - Bank account transfers

5.2 Payment Gateway Setup

Set up payment gateways properly.

• Obtain API credentials from gateway provider
• Configure gateway settings in WooCommerce
• Test payment processing in sandbox mode
• Enable for production after testing
• Configure payment method restrictions
• Set up webhook endpoints

5.3 Custom Payment Gateways

Develop custom payment gateways when needed.

function init_custom_gateway() {
    if (!class_exists('WC_Payment_Gateway')) {
        return;
    }
    
    class WC_Custom_Gateway extends WC_Payment_Gateway {
        public function __construct() {
            $this->id = 'custom_gateway';
            $this->method_title = 'Custom Gateway';
            $this->method_description = 'Custom payment gateway';
            $this->init_form_fields();
            $this->init_settings();
        }
        
        public function process_payment($order_id) {
            // Process payment logic
            return array(
                'result' => 'success',
                'redirect' => $this->get_return_url($order)
            );
        }
    }
}
add_action('plugins_loaded', 'init_custom_gateway');

5.4 Payment Gateway Testing

Test payment gateways thoroughly before going live.

• Test in sandbox/test mode
• Test various payment scenarios
• Test error handling
• Test refund processing
• Verify webhook handling