feat: add Newsletter Campaigns backend infrastructure

- Add CampaignManager.php with CPT registration, CRUD, batch sending
- Add CampaignsController.php with 8 REST endpoints (list, create, get, update, delete, send, test, preview)
- Register newsletter_campaign event in EventRegistry for email template
- Initialize CampaignManager in Bootstrap.php
- Register routes in Routes.php

includes/Api/CampaignsController.php

@@ -0,0 +1,320 @@
+<?php
+/**
+ * Campaigns REST Controller
+ * 
+ * REST API endpoints for newsletter campaigns
+ * 
+ * @package WooNooW\API
+ */
+
+namespace WooNooW\API;
+
+use WP_REST_Request;
+use WP_REST_Response;
+use WP_Error;
+use WooNooW\Core\Campaigns\CampaignManager;
+
+class CampaignsController {
+    
+    const API_NAMESPACE = 'woonoow/v1';
+    
+    /**
+     * Register REST routes
+     */
+    public static function register_routes() {
+        // List campaigns
+        register_rest_route(self::API_NAMESPACE, '/campaigns', [
+            'methods' => 'GET',
+            'callback' => [__CLASS__, 'get_campaigns'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Create campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns', [
+            'methods' => 'POST',
+            'callback' => [__CLASS__, 'create_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Get single campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)', [
+            'methods' => 'GET',
+            'callback' => [__CLASS__, 'get_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Update campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)', [
+            'methods' => 'PUT',
+            'callback' => [__CLASS__, 'update_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Delete campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)', [
+            'methods' => 'DELETE',
+            'callback' => [__CLASS__, 'delete_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Send campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)/send', [
+            'methods' => 'POST',
+            'callback' => [__CLASS__, 'send_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Send test email
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)/test', [
+            'methods' => 'POST',
+            'callback' => [__CLASS__, 'send_test_email'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+        
+        // Preview campaign
+        register_rest_route(self::API_NAMESPACE, '/campaigns/(?P<id>\d+)/preview', [
+            'methods' => 'GET',
+            'callback' => [__CLASS__, 'preview_campaign'],
+            'permission_callback' => [__CLASS__, 'check_admin_permission'],
+        ]);
+    }
+    
+    /**
+     * Check admin permission
+     */
+    public static function check_admin_permission() {
+        return current_user_can('manage_options');
+    }
+    
+    /**
+     * Get all campaigns
+     */
+    public static function get_campaigns(WP_REST_Request $request) {
+        $campaigns = CampaignManager::get_all();
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'data' => $campaigns,
+        ]);
+    }
+    
+    /**
+     * Create campaign
+     */
+    public static function create_campaign(WP_REST_Request $request) {
+        $data = [
+            'title' => $request->get_param('title'),
+            'subject' => $request->get_param('subject'),
+            'content' => $request->get_param('content'),
+            'status' => $request->get_param('status') ?: 'draft',
+            'scheduled_at' => $request->get_param('scheduled_at'),
+        ];
+        
+        $campaign_id = CampaignManager::create($data);
+        
+        if (is_wp_error($campaign_id)) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => $campaign_id->get_error_message(),
+            ], 400);
+        }
+        
+        $campaign = CampaignManager::get($campaign_id);
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'data' => $campaign,
+        ], 201);
+    }
+    
+    /**
+     * Get single campaign
+     */
+    public static function get_campaign(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        $campaign = CampaignManager::get($campaign_id);
+        
+        if (!$campaign) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => __('Campaign not found', 'woonoow'),
+            ], 404);
+        }
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'data' => $campaign,
+        ]);
+    }
+    
+    /**
+     * Update campaign
+     */
+    public static function update_campaign(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        
+        $data = [];
+        
+        if ($request->has_param('title')) {
+            $data['title'] = $request->get_param('title');
+        }
+        if ($request->has_param('subject')) {
+            $data['subject'] = $request->get_param('subject');
+        }
+        if ($request->has_param('content')) {
+            $data['content'] = $request->get_param('content');
+        }
+        if ($request->has_param('status')) {
+            $data['status'] = $request->get_param('status');
+        }
+        if ($request->has_param('scheduled_at')) {
+            $data['scheduled_at'] = $request->get_param('scheduled_at');
+        }
+        
+        $result = CampaignManager::update($campaign_id, $data);
+        
+        if (is_wp_error($result)) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => $result->get_error_message(),
+            ], 400);
+        }
+        
+        $campaign = CampaignManager::get($campaign_id);
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'data' => $campaign,
+        ]);
+    }
+    
+    /**
+     * Delete campaign
+     */
+    public static function delete_campaign(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        
+        $result = CampaignManager::delete($campaign_id);
+        
+        if (!$result) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => __('Failed to delete campaign', 'woonoow'),
+            ], 400);
+        }
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'message' => __('Campaign deleted', 'woonoow'),
+        ]);
+    }
+    
+    /**
+     * Send campaign
+     */
+    public static function send_campaign(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        
+        $result = CampaignManager::send($campaign_id);
+        
+        if (!$result['success']) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => $result['error'],
+            ], 400);
+        }
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'message' => sprintf(
+                __('Campaign sent to %d recipients (%d failed)', 'woonoow'),
+                $result['sent'],
+                $result['failed']
+            ),
+            'sent' => $result['sent'],
+            'failed' => $result['failed'],
+            'total' => $result['total'],
+        ]);
+    }
+    
+    /**
+     * Send test email
+     */
+    public static function send_test_email(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        $email = sanitize_email($request->get_param('email'));
+        
+        if (!is_email($email)) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => __('Invalid email address', 'woonoow'),
+            ], 400);
+        }
+        
+        $result = CampaignManager::send_test($campaign_id, $email);
+        
+        if (!$result) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => __('Failed to send test email', 'woonoow'),
+            ], 400);
+        }
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'message' => sprintf(__('Test email sent to %s', 'woonoow'), $email),
+        ]);
+    }
+    
+    /**
+     * Preview campaign
+     */
+    public static function preview_campaign(WP_REST_Request $request) {
+        $campaign_id = (int) $request->get_param('id');
+        $campaign = CampaignManager::get($campaign_id);
+        
+        if (!$campaign) {
+            return new WP_REST_Response([
+                'success' => false,
+                'error' => __('Campaign not found', 'woonoow'),
+            ], 404);
+        }
+        
+        // Use reflection to call private render method or make it public
+        // For now, return a simple preview
+        $renderer = \WooNooW\Core\Notifications\EmailRenderer::instance();
+        $template = $renderer->get_template_settings('newsletter_campaign', 'customer');
+        
+        $content = $campaign['content'];
+        $subject = $campaign['subject'] ?: $campaign['title'];
+        
+        if ($template) {
+            $content = str_replace('{content}', $campaign['content'], $template['body']);
+            $content = str_replace('{campaign_title}', $campaign['title'], $content);
+        }
+        
+        // Replace placeholders
+        $site_name = get_bloginfo('name');
+        $content = str_replace(['{site_name}', '{store_name}'], $site_name, $content);
+        $content = str_replace('{site_url}', home_url(), $content);
+        $content = str_replace('{subscriber_email}', 'subscriber@example.com', $content);
+        $content = str_replace('{unsubscribe_url}', '#unsubscribe', $content);
+        $content = str_replace('{current_date}', date_i18n(get_option('date_format')), $content);
+        $content = str_replace('{current_year}', date('Y'), $content);
+        
+        // Render with design template
+        $design_path = $renderer->get_design_template();
+        if (file_exists($design_path)) {
+            $content = $renderer->render_html($design_path, $content, $subject, [
+                'site_name' => $site_name,
+                'site_url' => home_url(),
+            ]);
+        }
+        
+        return new WP_REST_Response([
+            'success' => true,
+            'subject' => $subject,
+            'html' => $content,
+        ]);
+    }
+}

includes/Api/Routes.php

@@ -23,6 +23,7 @@ use WooNooW\Api\CustomersController;
 use WooNooW\Api\NewsletterController;
 use WooNooW\Api\ModulesController;
 use WooNooW\Api\ModuleSettingsController;
+use WooNooW\Api\CampaignsController;
 use WooNooW\Frontend\ShopController;
 use WooNooW\Frontend\CartController as FrontendCartController;
 use WooNooW\Frontend\AccountController;
@@ -125,6 +126,9 @@ class Routes {
             // Newsletter controller
             NewsletterController::register_routes();
             
+            // Campaigns controller
+            CampaignsController::register_routes();
+            
             // Modules controller
             $modules_controller = new ModulesController();
             $modules_controller->register_routes();

includes/Core/Bootstrap.php

@@ -22,6 +22,7 @@ use WooNooW\Core\DataStores\OrderStore;
 use WooNooW\Core\MediaUpload;
 use WooNooW\Core\Notifications\PushNotificationHandler;
 use WooNooW\Core\Notifications\EmailManager;
+use WooNooW\Core\Campaigns\CampaignManager;
 use WooNooW\Core\ActivityLog\ActivityLogTable;
 use WooNooW\Branding;
 use WooNooW\Frontend\Assets as FrontendAssets;
@@ -40,6 +41,7 @@ class Bootstrap {
         MediaUpload::init();
         PushNotificationHandler::init();
         EmailManager::instance(); // Initialize custom email system
+        CampaignManager::init(); // Initialize campaigns CPT
         
         // Frontend (customer-spa)
         FrontendAssets::init();

includes/Core/Campaigns/CampaignManager.php

@@ -0,0 +1,483 @@
+<?php
+/**
+ * Campaign Manager
+ * 
+ * Manages newsletter campaign CRUD operations and sending
+ * 
+ * @package WooNooW\Core\Campaigns
+ */
+
+namespace WooNooW\Core\Campaigns;
+
+if (!defined('ABSPATH')) exit;
+
+class CampaignManager {
+    
+    const POST_TYPE = 'wnw_campaign';
+    const CRON_HOOK = 'woonoow_process_scheduled_campaigns';
+    
+    private static $instance = null;
+    
+    /**
+     * Get instance
+     */
+    public static function instance() {
+        if (self::$instance === null) {
+            self::$instance = new self();
+        }
+        return self::$instance;
+    }
+    
+    /**
+     * Initialize
+     */
+    public static function init() {
+        add_action('init', [__CLASS__, 'register_post_type']);
+        add_action(self::CRON_HOOK, [__CLASS__, 'process_scheduled_campaigns']);
+    }
+    
+    /**
+     * Register campaign post type
+     */
+    public static function register_post_type() {
+        register_post_type(self::POST_TYPE, [
+            'labels' => [
+                'name' => __('Campaigns', 'woonoow'),
+                'singular_name' => __('Campaign', 'woonoow'),
+            ],
+            'public' => false,
+            'show_ui' => false,
+            'show_in_rest' => false,
+            'supports' => ['title'],
+            'capability_type' => 'post',
+            'map_meta_cap' => true,
+        ]);
+    }
+    
+    /**
+     * Create a new campaign
+     * 
+     * @param array $data Campaign data
+     * @return int|WP_Error Campaign ID or error
+     */
+    public static function create($data) {
+        $post_data = [
+            'post_type' => self::POST_TYPE,
+            'post_status' => 'publish',
+            'post_title' => sanitize_text_field($data['title'] ?? 'Untitled Campaign'),
+        ];
+        
+        $campaign_id = wp_insert_post($post_data, true);
+        
+        if (is_wp_error($campaign_id)) {
+            return $campaign_id;
+        }
+        
+        // Save meta fields
+        self::update_meta($campaign_id, $data);
+        
+        return $campaign_id;
+    }
+    
+    /**
+     * Update campaign
+     * 
+     * @param int $campaign_id Campaign ID
+     * @param array $data Campaign data
+     * @return bool|WP_Error
+     */
+    public static function update($campaign_id, $data) {
+        $post = get_post($campaign_id);
+        
+        if (!$post || $post->post_type !== self::POST_TYPE) {
+            return new \WP_Error('invalid_campaign', __('Campaign not found', 'woonoow'));
+        }
+        
+        // Update title if provided
+        if (isset($data['title'])) {
+            wp_update_post([
+                'ID' => $campaign_id,
+                'post_title' => sanitize_text_field($data['title']),
+            ]);
+        }
+        
+        // Update meta fields
+        self::update_meta($campaign_id, $data);
+        
+        return true;
+    }
+    
+    /**
+     * Update campaign meta
+     * 
+     * @param int $campaign_id
+     * @param array $data
+     */
+    private static function update_meta($campaign_id, $data) {
+        $meta_fields = [
+            'subject' => '_wnw_subject',
+            'content' => '_wnw_content',
+            'status' => '_wnw_status',
+            'scheduled_at' => '_wnw_scheduled_at',
+        ];
+        
+        foreach ($meta_fields as $key => $meta_key) {
+            if (isset($data[$key])) {
+                $value = $data[$key];
+                
+                // Sanitize based on field type
+                if ($key === 'content') {
+                    $value = wp_kses_post($value);
+                } elseif ($key === 'scheduled_at') {
+                    $value = sanitize_text_field($value);
+                } elseif ($key === 'status') {
+                    $allowed = ['draft', 'scheduled', 'sending', 'sent', 'failed'];
+                    $value = in_array($value, $allowed) ? $value : 'draft';
+                } else {
+                    $value = sanitize_text_field($value);
+                }
+                
+                update_post_meta($campaign_id, $meta_key, $value);
+            }
+        }
+        
+        // Set default status if not provided
+        if (!get_post_meta($campaign_id, '_wnw_status', true)) {
+            update_post_meta($campaign_id, '_wnw_status', 'draft');
+        }
+    }
+    
+    /**
+     * Get campaign by ID
+     * 
+     * @param int $campaign_id
+     * @return array|null
+     */
+    public static function get($campaign_id) {
+        $post = get_post($campaign_id);
+        
+        if (!$post || $post->post_type !== self::POST_TYPE) {
+            return null;
+        }
+        
+        return self::format_campaign($post);
+    }
+    
+    /**
+     * Get all campaigns
+     * 
+     * @param array $args Query args
+     * @return array
+     */
+    public static function get_all($args = []) {
+        $defaults = [
+            'post_type' => self::POST_TYPE,
+            'post_status' => 'any',
+            'posts_per_page' => -1,
+            'orderby' => 'date',
+            'order' => 'DESC',
+        ];
+        
+        $query_args = wp_parse_args($args, $defaults);
+        $query_args['post_type'] = self::POST_TYPE; // Force post type
+        
+        $posts = get_posts($query_args);
+        
+        return array_map([__CLASS__, 'format_campaign'], $posts);
+    }
+    
+    /**
+     * Format campaign post to array
+     * 
+     * @param WP_Post $post
+     * @return array
+     */
+    private static function format_campaign($post) {
+        return [
+            'id' => $post->ID,
+            'title' => $post->post_title,
+            'subject' => get_post_meta($post->ID, '_wnw_subject', true),
+            'content' => get_post_meta($post->ID, '_wnw_content', true),
+            'status' => get_post_meta($post->ID, '_wnw_status', true) ?: 'draft',
+            'scheduled_at' => get_post_meta($post->ID, '_wnw_scheduled_at', true),
+            'sent_at' => get_post_meta($post->ID, '_wnw_sent_at', true),
+            'recipient_count' => (int) get_post_meta($post->ID, '_wnw_recipient_count', true),
+            'sent_count' => (int) get_post_meta($post->ID, '_wnw_sent_count', true),
+            'failed_count' => (int) get_post_meta($post->ID, '_wnw_failed_count', true),
+            'created_at' => $post->post_date,
+            'updated_at' => $post->post_modified,
+        ];
+    }
+    
+    /**
+     * Delete campaign
+     * 
+     * @param int $campaign_id
+     * @return bool
+     */
+    public static function delete($campaign_id) {
+        $post = get_post($campaign_id);
+        
+        if (!$post || $post->post_type !== self::POST_TYPE) {
+            return false;
+        }
+        
+        return wp_delete_post($campaign_id, true) !== false;
+    }
+    
+    /**
+     * Send campaign
+     * 
+     * @param int $campaign_id
+     * @return array Result with sent/failed counts
+     */
+    public static function send($campaign_id) {
+        $campaign = self::get($campaign_id);
+        
+        if (!$campaign) {
+            return ['success' => false, 'error' => __('Campaign not found', 'woonoow')];
+        }
+        
+        if ($campaign['status'] === 'sent') {
+            return ['success' => false, 'error' => __('Campaign already sent', 'woonoow')];
+        }
+        
+        // Get subscribers
+        $subscribers = self::get_subscribers();
+        
+        if (empty($subscribers)) {
+            return ['success' => false, 'error' => __('No subscribers to send to', 'woonoow')];
+        }
+        
+        // Update status to sending
+        update_post_meta($campaign_id, '_wnw_status', 'sending');
+        update_post_meta($campaign_id, '_wnw_recipient_count', count($subscribers));
+        
+        $sent = 0;
+        $failed = 0;
+        
+        // Get email template
+        $template = self::render_campaign_email($campaign);
+        
+        // Send in batches
+        $batch_size = 50;
+        $batches = array_chunk($subscribers, $batch_size);
+        
+        foreach ($batches as $batch) {
+            foreach ($batch as $subscriber) {
+                $email = $subscriber['email'];
+                
+                // Replace subscriber-specific variables
+                $body = str_replace('{subscriber_email}', $email, $template['body']);
+                $body = str_replace('{unsubscribe_url}', self::get_unsubscribe_url($email), $body);
+                
+                // Send email
+                $result = wp_mail(
+                    $email,
+                    $template['subject'],
+                    $body,
+                    ['Content-Type: text/html; charset=UTF-8']
+                );
+                
+                if ($result) {
+                    $sent++;
+                } else {
+                    $failed++;
+                }
+            }
+            
+            // Small delay between batches
+            if (count($batches) > 1) {
+                sleep(2);
+            }
+        }
+        
+        // Update campaign stats
+        update_post_meta($campaign_id, '_wnw_sent_count', $sent);
+        update_post_meta($campaign_id, '_wnw_failed_count', $failed);
+        update_post_meta($campaign_id, '_wnw_sent_at', current_time('mysql'));
+        update_post_meta($campaign_id, '_wnw_status', $failed > 0 && $sent === 0 ? 'failed' : 'sent');
+        
+        return [
+            'success' => true,
+            'sent' => $sent,
+            'failed' => $failed,
+            'total' => count($subscribers),
+        ];
+    }
+    
+    /**
+     * Send test email
+     * 
+     * @param int $campaign_id
+     * @param string $email Test email address
+     * @return bool
+     */
+    public static function send_test($campaign_id, $email) {
+        $campaign = self::get($campaign_id);
+        
+        if (!$campaign) {
+            return false;
+        }
+        
+        $template = self::render_campaign_email($campaign);
+        
+        // Replace subscriber-specific variables
+        $body = str_replace('{subscriber_email}', $email, $template['body']);
+        $body = str_replace('{unsubscribe_url}', '#', $body);
+        
+        return wp_mail(
+            $email,
+            '[TEST] ' . $template['subject'],
+            $body,
+            ['Content-Type: text/html; charset=UTF-8']
+        );
+    }
+    
+    /**
+     * Render campaign email using EmailRenderer
+     * 
+     * @param array $campaign
+     * @return array ['subject' => string, 'body' => string]
+     */
+    private static function render_campaign_email($campaign) {
+        $renderer = \WooNooW\Core\Notifications\EmailRenderer::instance();
+        
+        // Get the campaign email template
+        $template = $renderer->get_template_settings('newsletter_campaign', 'customer');
+        
+        // Fallback if no template configured
+        if (!$template) {
+            $subject = $campaign['subject'] ?: $campaign['title'];
+            $body = $campaign['content'];
+        } else {
+            $subject = $template['subject'] ?: $campaign['subject'];
+            
+            // Replace {content} with campaign content
+            $body = str_replace('{content}', $campaign['content'], $template['body']);
+            
+            // Replace {campaign_title}
+            $body = str_replace('{campaign_title}', $campaign['title'], $body);
+        }
+        
+        // Replace common variables
+        $site_name = get_bloginfo('name');
+        $site_url = home_url();
+        
+        $subject = str_replace(['{site_name}', '{store_name}'], $site_name, $subject);
+        $body = str_replace(['{site_name}', '{store_name}'], $site_name, $body);
+        $body = str_replace('{site_url}', $site_url, $body);
+        $body = str_replace('{current_date}', date_i18n(get_option('date_format')), $body);
+        $body = str_replace('{current_year}', date('Y'), $body);
+        
+        // Render through email design template
+        $design_path = $renderer->get_design_template();
+        if (file_exists($design_path)) {
+            $body = $renderer->render_html($design_path, $body, $subject, [
+                'site_name' => $site_name,
+                'site_url' => $site_url,
+            ]);
+        }
+        
+        return [
+            'subject' => $subject,
+            'body' => $body,
+        ];
+    }
+    
+    /**
+     * Get subscribers
+     * 
+     * @return array
+     */
+    private static function get_subscribers() {
+        // Check if using custom table
+        $use_table = !get_option('woonoow_newsletter_limit_enabled', true);
+        
+        if ($use_table && self::has_subscribers_table()) {
+            global $wpdb;
+            $table = $wpdb->prefix . 'woonoow_subscribers';
+            return $wpdb->get_results(
+                "SELECT email, user_id FROM {$table} WHERE status = 'active'",
+                ARRAY_A
+            );
+        }
+        
+        // Use wp_options storage
+        $subscribers = get_option('woonoow_newsletter_subscribers', []);
+        return array_filter($subscribers, function($sub) {
+            return ($sub['status'] ?? 'active') === 'active';
+        });
+    }
+    
+    /**
+     * Check if subscribers table exists
+     * 
+     * @return bool
+     */
+    private static function has_subscribers_table() {
+        global $wpdb;
+        $table = $wpdb->prefix . 'woonoow_subscribers';
+        return $wpdb->get_var("SHOW TABLES LIKE '{$table}'") === $table;
+    }
+    
+    /**
+     * Get unsubscribe URL
+     * 
+     * @param string $email
+     * @return string
+     */
+    private static function get_unsubscribe_url($email) {
+        $token = wp_hash($email . 'woonoow_unsubscribe');
+        return add_query_arg([
+            'woonoow_unsubscribe' => 1,
+            'email' => urlencode($email),
+            'token' => $token,
+        ], home_url());
+    }
+    
+    /**
+     * Process scheduled campaigns (WP-Cron)
+     */
+    public static function process_scheduled_campaigns() {
+        // Only if scheduling is enabled
+        if (!get_option('woonoow_campaign_scheduling_enabled', false)) {
+            return;
+        }
+        
+        $campaigns = self::get_all([
+            'meta_query' => [
+                [
+                    'key' => '_wnw_status',
+                    'value' => 'scheduled',
+                ],
+                [
+                    'key' => '_wnw_scheduled_at',
+                    'value' => current_time('mysql'),
+                    'compare' => '<=',
+                    'type' => 'DATETIME',
+                ],
+            ],
+        ]);
+        
+        foreach ($campaigns as $campaign) {
+            self::send($campaign['id']);
+        }
+    }
+    
+    /**
+     * Enable scheduling (registers cron)
+     */
+    public static function enable_scheduling() {
+        if (!wp_next_scheduled(self::CRON_HOOK)) {
+            wp_schedule_event(time(), 'hourly', self::CRON_HOOK);
+        }
+    }
+    
+    /**
+     * Disable scheduling (clears cron)
+     */
+    public static function disable_scheduling() {
+        wp_clear_scheduled_hook(self::CRON_HOOK);
+    }
+}

includes/Core/Notifications/EventRegistry.php

@@ -63,6 +63,21 @@ class EventRegistry {
             'wc_email' => '',
             'enabled' => true,
         ],
+        'newsletter_campaign' => [
+            'id' => 'newsletter_campaign',
+            'label' => __('Newsletter Campaign', 'woonoow'),
+            'description' => __('Master email design template for newsletter campaigns', 'woonoow'),
+            'category' => 'marketing',
+            'recipient_type' => 'customer',
+            'wc_email' => '',
+            'enabled' => true,
+            'variables' => [
+                '{content}' => __('Campaign content', 'woonoow'),
+                '{campaign_title}' => __('Campaign title', 'woonoow'),
+                '{subscriber_email}' => __('Subscriber email', 'woonoow'),
+                '{unsubscribe_url}' => __('Unsubscribe link', 'woonoow'),
+            ],
+        ],
 
         // ===== ORDER INITIATION =====
         'order_placed' => [