Gold Certificate Verifier - WordPress Plugin

A professional WordPress plugin for managing and displaying gold bar product certificates with verification capabilities.

Features

• Professional Certificate Display: Beautiful, responsive certificate pages matching industry standards
• Custom URL Routing: Access certificates via clean URLs like /cert/U0302258
• Admin Dashboard: Manage certificates with an intuitive admin interface
• Bulk Import: Import certificates from CSV files
• Product Gallery: Display multiple product images with zoom functionality
• QR Code Generation: Automatic QR codes linking to certificate verification
• Print & PDF: Print or download certificates as PDF
• Responsive Design: Fully responsive on desktop, tablet, and mobile devices
• Security: Built-in validation and sanitization
• Contact Information: Display company contact details on certificates

Installation

1. Upload Plugin Files

1. Download the gold-certificate-verifier folder
2. Upload it to /wp-content/plugins/ directory via FTP or file manager
3. Alternatively, use WordPress plugin uploader:
   • Go to Plugins > Add New > Upload Plugin
   • Select the plugin ZIP file
   • Click "Install Now"

2. Activate Plugin

1. Go to Plugins in WordPress admin
2. Find "Gold Certificate Verifier"
3. Click "Activate"

3. Configure Settings

1. Go to Gold Certificates > Settings in the admin menu
2. Enter your company information:
   • Phone number
   • Email address
   • Website URL
3. Click "Save Settings"

Usage

Adding Certificates

Method 1: Manual Entry

1. Go to Gold Certificates > Add Certificate
2. Fill in the certificate details:
   • Certificate No. - Unique identifier (e.g., U0302258)
   • Item Code - Internal product code (e.g., GCB460)
   • Product Name - Product title (e.g., 999.9 - Gold Cast Bar)
   • Metal - Type of metal (default: Gold)
   • Weight (Gram) - Product weight in grams
   • Fineness - Purity level (e.g., 999.9)
   • Certification Date - Date of certification
   • Origin - Country of origin (default: Malaysia)
   • Certified Assayer - Company name and registration
   • Product Image - Upload primary product image
3. Click "Add Certificate"

Method 2: CSV Bulk Import

1. Prepare a CSV file with the following columns:

   certificate_no,item_code,product_name,metal,weight,fineness,cert_date,origin,assayer,image_url
   U0302258,GCB460,999.9 - Gold Cast Bar,Gold,100,999.9,2026-03-26,Malaysia,Refine Au Sdn Bhd (1246791-K),https://example.com/image.jpg

2. Go to Gold Certificates > All Certificates

3. Use the import function (if available) or manually add certificates

Viewing Certificates

Customers can view certificates using:

1. Pretty URL: https://yourdomain.com/cert/U0302258
2. Query Parameter: https://yourdomain.com/verify/?q=U0302258

Both URLs will display the professional certificate page with:

• Product image and gallery
• Complete certificate details
• QR code for verification
• Print and PDF download options
• Company contact information

Managing Certificates

1. Go to Gold Certificates > All Certificates
2. View all certificates in a table format
3. Click "View" to see the public certificate page
4. Click "Delete" to remove a certificate

Database Schema

The plugin creates a custom table wp_gold_certificates with the following fields:

URL Routing

The plugin implements custom WordPress rewrite rules:

Rewrite Rule 1: /cert/{code}

• Pattern: ^cert/([a-zA-Z0-9_-]+)/?$
• Maps to: index.php?gcv_cert=$matches[1]

Rewrite Rule 2: /verify/?q={code}

• Pattern: ^verify/?$
• Maps to: index.php?gcv_verify=1

Note: After activating the plugin, go to Settings > Permalinks and click "Save Changes" to flush rewrite rules.

Customization

Styling

The plugin uses CSS custom properties for easy theming:

:root {
    --gold-primary: #d4af37;
    --gold-dark: #b8941f;
    --charcoal: #2c2c2c;
    --dark-bg: #1a1a1a;
    --light-bg: #f5f5f5;
    --border-color: #ddd;
    --text-color: #333;
}

Edit /assets/css/public.css to customize colors and styling.

Adding Custom Fields

To add custom fields to certificates:

1. Modify the database table in includes/class-db.php
2. Update the form in includes/class-admin.php
3. Update the display template in includes/class-renderer.php

Security Features

• Input Sanitization: All user inputs are sanitized using WordPress functions
• SQL Injection Prevention: Uses prepared statements with $wpdb->prepare()
• XSS Protection: All outputs are escaped using esc_html(), esc_url(), etc.
• Nonce Verification: Admin actions are protected with WordPress nonces
• Capability Checks: Only administrators can access certificate management

Troubleshooting

Certificates Not Showing

1. Check Permalink Settings:

   • Go to Settings > Permalinks
   • Ensure "Post name" or custom structure is selected
   • Click "Save Changes" to flush rewrite rules

2. Verify Database Table:

   • Ensure the plugin was properly activated
   • Check that wp_gold_certificates table exists in the database

3. Check Certificate Status:

   • Ensure certificate status is set to "active"

404 Error on Certificate Page

1. Verify the certificate number exists in the database
2. Check that the URL format is correct: /cert/CERTIFICATE_NO
3. Flush rewrite rules: Settings > Permalinks > Save Changes

Images Not Displaying

1. Verify image URLs are correct and accessible
2. Check server file permissions
3. Ensure the image URL is properly formatted (starts with http:// or https://)

Support & Development

For support, feature requests, or bug reports, please contact the plugin developer.

License

This plugin is licensed under the GPL-2.0+ License. See LICENSE file for details.

Changelog

Version 1.0.0

• Initial release
• Core certificate management functionality
• Professional certificate display
• Admin dashboard
• CSV import support
• QR code generation
• Print and PDF support