Custom Post Types & Metadata

• Implements event and registration custom post types with full admin CRUD capabilities.
• Events include metadata: start/end datetime, venue, address, coordinates (latitude/longitude), and capacity.
• Registrations track user-provided data, requested seats, and approval status.
• Admin interface supports bulk approval, meta editing, and list view customization.

Frontend Calendar & Dynamic Interaction

• FullCalendar integration for responsive month/week/day views with dynamic event rendering.
• AJAX-based registration form submits user data asynchronously without page reloads.
• Event modals display detailed metadata including Google Maps location.
• Frontend scripts and styles dynamically enqueued only when needed.

Email & Notification System

• Configurable multi-provider email system (Mailgun, SendGrid, or fallback to wp_mail).
• Sends notifications for new registration submissions and admin-approved registrations.
• Supports API-based integration with external email providers using secure keys.

REST API & AJAX Endpoints

• Exposes REST API endpoint for fetching event data in JSON for frontend rendering.
• AJAX endpoints handle registration submission and admin approval actions securely.
• Nonces and capability checks prevent unauthorized access.

Security & Data Validation

• Sanitization and validation applied to all user inputs from frontend and admin.
• Role-based access control for sensitive operations like approval and configuration.
• Secure handling of API keys and sensitive metadata.

Plugin Architecture & Extensibility

• Modular design separates core logic, admin interface, frontend rendering, email handling, and activation routines.
• Uses WordPress hooks, actions, and filters for extensibility.
• Activation routine initializes default data and flushes rewrite rules.
• Fully compatible with WordPress REST API and modern themes.