WooCommerce Integration

// Add to wp-config.php (before "That's all, stop editing!")
define('VOUCHERTRACK_API_KEY', 'your_api_key_here');

<?php
/**
 * VoucherTrack Integration for WooCommerce
 * Validates voucher codes at checkout and records redemptions on order completion
 */

// Validate VoucherTrack codes when coupon is applied
add_filter('woocommerce_coupon_is_valid', 'vouchertrack_validate_coupon', 10, 2);
function vouchertrack_validate_coupon($valid, $coupon) {
    $code = strtoupper($coupon->get_code());
    
    // Skip if it's a regular WooCommerce coupon (check if it exists in WC)
    $wc_coupon = new WC_Coupon($code);
    if ($wc_coupon->get_id() > 0) {
        return $valid; // Let WooCommerce handle its own coupons
    }
    
    // Call VoucherTrack validation
    $response = wp_remote_get(
        "https://www.vouchertrack.io/api/webhook/validate/{$code}",
        array(
            'headers' => array(
                'X-API-Key' => VOUCHERTRACK_API_KEY
            ),
            'timeout' => 10
        )
    );
    
    if (is_wp_error($response)) {
        throw new Exception(__('Could not validate voucher. Please try again.', 'woocommerce'));
    }
    
    $data = json_decode(wp_remote_retrieve_body($response), true);
    
    if (!$data['valid']) {
        $error = isset($data['error']) ? $data['error'] : 'Invalid voucher code';
        throw new Exception($error);
    }
    
    // Store voucher data in session for later use
    WC()->session->set('vouchertrack_voucher_' . $code, $data);
    
    return true;
}

// Apply VoucherTrack discount to cart
add_action('woocommerce_cart_calculate_fees', 'vouchertrack_apply_discount');
function vouchertrack_apply_discount($cart) {
    if (is_admin() && !defined('DOING_AJAX')) return;
    
    foreach ($cart->get_applied_coupons() as $code) {
        $voucher_data = WC()->session->get('vouchertrack_voucher_' . strtoupper($code));
        
        if ($voucher_data && $voucher_data['valid']) {
            $cart_total = $cart->get_subtotal();
            
            // Check minimum spend
            if (!empty($voucher_data['minimum_spend']) && $cart_total < $voucher_data['minimum_spend']) {
                continue; // Don't apply if minimum not met
            }
            
            // Calculate discount based on type
            $discount = 0;
            if ($voucher_data['discount_type'] === 'percentage') {
                $discount = $cart_total * ($voucher_data['discount_value'] / 100);
            } elseif ($voucher_data['discount_type'] === 'fixed') {
                $discount = min($voucher_data['discount_value'], $cart_total);
            }
            
            if ($discount > 0) {
                $cart->add_fee(
                    sprintf('VoucherTrack: %s', $voucher_data['discount_description']),
                    -$discount,
                    false // Not taxable
                );
            }
        }
    }
}

// Record redemption when order is completed
add_action('woocommerce_order_status_completed', 'vouchertrack_record_redemption');
add_action('woocommerce_order_status_processing', 'vouchertrack_record_redemption');
function vouchertrack_record_redemption($order_id) {
    $order = wc_get_order($order_id);
    
    // Check if we've already processed this order
    if ($order->get_meta('_vouchertrack_recorded')) {
        return;
    }
    
    foreach ($order->get_coupon_codes() as $code) {
        $code = strtoupper($code);
        
        // Call VoucherTrack redemption endpoint
        $response = wp_remote_post(
            'https://www.vouchertrack.io/api/webhook/redemption',
            array(
                'headers' => array(
                    'X-API-Key' => VOUCHERTRACK_API_KEY,
                    'Content-Type' => 'application/json'
                ),
                'body' => json_encode(array(
                    'code' => $code,
                    'transaction_amount' => (float) $order->get_total(),
                    'order_reference' => $order->get_order_number(),
                    'redeemed_at' => current_time('c')
                )),
                'timeout' => 10
            )
        );
        
        if (!is_wp_error($response)) {
            $data = json_decode(wp_remote_retrieve_body($response), true);
            if (!empty($data['success'])) {
                $order->add_order_note(
                    sprintf('VoucherTrack: Code %s redeemed successfully', $code)
                );
            }
        }
    }
    
    // Mark as processed
    $order->update_meta_data('_vouchertrack_recorded', 'yes');
    $order->save();
}

// Allow VoucherTrack codes to be entered as coupons (even if not in WC database)
add_filter('woocommerce_coupon_code_is_valid', 'vouchertrack_allow_external_coupons', 10, 3);
function vouchertrack_allow_external_coupons($valid, $coupon_code, $coupon) {
    // If WooCommerce says invalid and it might be a VoucherTrack code, let it through
    if (!$valid) {
        // Check if it looks like a VoucherTrack code (contains hyphen typically)
        if (strpos($coupon_code, '-') !== false) {
            return true; // Allow validation to proceed
        }
    }
    return $valid;
}