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:

.wpdd-product-card {
    /* Your custom styles */
}

Adding Payment Methods

Extend payment options by hooking into:

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.

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Note: This plugin handles financial transactions. Always test thoroughly in a development environment before deploying to production.