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+# WP Digital Download
+
+A comprehensive WordPress plugin for creating a digital download marketplace where creators can sell digital products with PayPal integration.
+
+## Features
+
+### Core Functionality
+- **Custom Post Type**: Products with rich metadata
+- **User Roles**: Separate roles for customers and creators
+- **File Management**: Secure file upload and protection
+- **PayPal Integration**: Complete payment processing
+- **Download Protection**: Secure, time-limited downloads
+- **Watermarking**: Automatic watermarking for images and PDFs
+- **Purchase History**: Customer account management
+- **Admin Dashboard**: Complete order and sales management
+
+### Key Components
+
+#### Custom Post Types
+- **wpdd_product**: Digital products with pricing, files, and settings
+- **Product Categories & Tags**: Organization and filtering
+- **Creator Attribution**: Products linked to their creators
+
+#### User Management
+- **Digital Customer Role**: Purchase and download permissions
+- **Digital Creator Role**: Product management permissions
+- **Admin Capabilities**: Full system management
+
+#### Payment Processing
+- **PayPal Integration**: Sandbox and live modes
+- **Free Products**: No-payment downloads
+- **Guest Checkout**: Optional account creation
+- **Order Management**: Complete transaction tracking
+
+#### File Protection
+- **Protected Directory**: Files stored outside web root access
+- **Secure Downloads**: Token-based download links
+- **Download Limits**: Configurable per product
+- **Expiry Dates**: Time-limited access
+
+#### Watermarking
+- **Image Watermarking**: PNG, JPG, GIF support
+- **PDF Watermarking**: Text overlay on PDF files
+- **Dynamic Content**: Customer info in watermarks
+- **Configurable Settings**: Per-product control
+
+## Installation
+
+1. Upload the plugin files to `/wp-content/plugins/wp-digital-download/`
+2. Activate the plugin through the WordPress admin
+3. Configure PayPal settings in Digital Products > Settings
+4. Create your first product
+5. Add the shop shortcode `[wpdd_shop]` to a page
+
+## Configuration
+
+### PayPal Setup
+1. Create a PayPal Developer account
+2. Create a new application
+3. Get Client ID and Secret
+4. Configure in Settings > PayPal Settings
+
+### Pages Setup
+The plugin automatically creates these pages:
+- **Shop**: `[wpdd_shop]` - Product listing
+- **Checkout**: `[wpdd_checkout]` - Payment processing
+- **My Purchases**: `[wpdd_customer_purchases]` - Customer downloads
+- **Thank You**: `[wpdd_thank_you]` - Order confirmation
+
+## Shortcodes
+
+### Main Shortcodes
+- `[wpdd_shop]` - Display product storefront
+- `[wpdd_customer_purchases]` - Customer purchase history
+- `[wpdd_checkout]` - Checkout form
+- `[wpdd_thank_you]` - Thank you page
+- `[wpdd_product id="123"]` - Single product display
+
+### Shop Shortcode Options
+```
+[wpdd_shop columns="3" per_page="12" category="design" orderby="date" order="DESC" show_filters="yes"]
+```
+
+## Database Structure
+
+### Tables Created
+- `wp_wpdd_orders` - Purchase records
+- `wp_wpdd_downloads` - Download tracking
+- `wp_wpdd_download_links` - Secure download tokens
+
+### Key Meta Fields
+- `_wpdd_price` - Product price
+- `_wpdd_sale_price` - Sale price
+- `_wpdd_is_free` - Free product flag
+- `_wpdd_files` - Associated files
+- `_wpdd_download_limit` - Download restrictions
+- `_wpdd_download_expiry` - Access duration
+- `_wpdd_enable_watermark` - Watermark settings
+- `_wpdd_sales_count` - Sales tracking
+
+## File Structure
+
+```
+wp-digital-download/
+├── wp-digital-download.php          # Main plugin file
+├── includes/                        # Core functionality
+│   ├── class-wpdd-install.php      # Installation routines
+│   ├── class-wpdd-post-types.php   # Custom post types
+│   ├── class-wpdd-roles.php        # User roles
+│   ├── class-wpdd-metaboxes.php    # Product editing
+│   ├── class-wpdd-shortcodes.php   # Frontend display
+│   ├── class-wpdd-paypal.php       # Payment processing
+│   ├── class-wpdd-download-handler.php # File delivery
+│   ├── class-wpdd-customer.php     # Customer management
+│   ├── class-wpdd-orders.php       # Order processing
+│   ├── class-wpdd-file-protection.php # Security
+│   ├── class-wpdd-watermark.php    # Image processing
+│   └── class-wpdd-ajax.php         # AJAX handlers
+├── admin/                          # Admin interface
+│   ├── class-wpdd-admin.php       # Admin pages
+│   └── class-wpdd-settings.php    # Configuration
+└── assets/                         # Frontend resources
+    ├── css/
+    │   ├── frontend.css           # Public styling
+    │   └── admin.css              # Admin styling
+    └── js/
+        ├── frontend.js            # Public scripts
+        ├── admin.js               # Admin scripts
+        └── paypal.js              # Payment integration
+```
+
+## Hooks & Filters
+
+### Actions
+- `wpdd_order_completed` - Fired when order is completed
+- `wpdd_download_started` - Before file delivery
+- `wpdd_customer_registered` - New customer account
+
+### Filters
+- `wpdd_product_price` - Modify displayed price
+- `wpdd_download_url` - Customize download URLs
+- `wpdd_watermark_text` - Modify watermark content
+- `wpdd_email_content` - Customize email templates
+
+## Security Features
+
+### File Protection
+- Files stored in protected directory with .htaccess rules
+- Token-based download authentication
+- Time-limited access links
+- IP and user agent logging
+
+### Input Validation
+- All user inputs sanitized
+- Nonce verification on forms
+- Capability checks for admin functions
+- SQL injection prevention
+
+### Payment Security
+- PayPal webhook verification
+- Transaction ID tracking
+- Duplicate payment prevention
+- Secure credential storage
+
+## Customization
+
+### Template Override
+Create templates in your theme:
+```
+your-theme/
+└── wpdd-templates/
+    ├── single-product.php
+    ├── shop.php
+    └── checkout.php
+```
+
+### CSS Customization
+Override default styles:
+```css
+.wpdd-product-card {
+    /* Your custom styles */
+}
+```
+
+### Adding Payment Methods
+Extend payment options by hooking into:
+```php
+add_action('wpdd_payment_methods', 'add_stripe_payment');
+```
+
+## Requirements
+
+- WordPress 5.0+
+- PHP 7.4+
+- MySQL 5.6+
+- cURL extension
+- GD library (for watermarking)
+
+## Changelog
+
+### Version 1.0.0
+- Initial release
+- PayPal integration
+- File protection system
+- Watermarking capabilities
+- Customer management
+- Admin dashboard
+
+## Support
+
+For support and feature requests, please create an issue in the GitHub repository.
+
+## License
+
+This plugin is licensed under the GPL v2 or later.
+
+---
+
+**Note**: This plugin handles financial transactions. Always test thoroughly in a development environment before deploying to production.