# USMS-GH WC SMS Notification - Upgrade to Version 2.1.0

## Overview
This document outlines all the changes made to upgrade the plugin to version 2.1.0, ensuring full compatibility with the latest WordPress and WooCommerce versions.

## Version Information
- **Previous Version:** 2.0.1
- **New Version:** 2.1.0
- **Release Date:** December 2024

## Compatibility Updates

### WordPress
- **Previous:** Tested up to 6.3.1
- **Current:** Tested up to 6.7
- **Minimum Required:** 5.8 (updated from 3.8)

### WooCommerce
- **Previous:** Tested up to 8.2
- **Current:** Tested up to 9.5
- **Minimum Required:** 7.0 (updated from 2.6)

### PHP
- **Previous:** 5.6
- **Current:** 7.4 minimum requirement
- **Reason:** PHP 5.6 reached end-of-life in 2019. PHP 7.4+ provides better performance and security.

## Major Changes

### 1. HPOS (High-Performance Order Storage) Support ✅
**What is HPOS?**
WooCommerce introduced Custom Order Tables (HPOS) to improve order data storage performance and scalability.

**Changes Made:**
- Added HPOS compatibility declaration in main plugin file
- Updated order meta data retrieval to use `$order->get_meta()` instead of `get_post_meta()`
- Ensured all order data access uses WooCommerce getter methods

**Files Modified:**
- `usmsgh-woocommerce.php` - Added HPOS declaration
- `includes/class-usmsgh-woocommerce-notification.php` - Updated meta data access
- `includes/multivendor/class-usmsgh-multivendor-notification.php` - Updated meta data access

**Code Example:**
```php
// Before (not HPOS compatible)
$post_data = get_post_meta( $order_details->get_order_number(), $field, true );

// After (HPOS compatible)
$post_data = $order_details->get_meta( $field, true );
```

### 2. Security Enhancements 🔒

#### Nonce Verification
Added proper nonce verification to prevent CSRF attacks:

**Files Modified:**
- `admin/sendsms.php` - Added nonce verification to SMS sending and profile updates

**Changes:**
- SMS send form now verifies nonce before processing
- User profile updates verify nonces before saving
- All POST data access now uses `wp_unslash()` and proper sanitization

#### Input Sanitization
Improved input sanitization throughout the plugin:

**Key Changes:**
- All `$_POST` and `$_GET` access now wrapped with `sanitize_text_field()` and `wp_unslash()`
- Pagination parameters validated using `absint()` for integer validation
- Added capability checks before processing sensitive operations

**Files Modified:**
- `admin/sendsms.php` - Multiple security improvements
- `admin/smsoutbox.php` - Improved pagination security

### 3. Order Data Access Improvements

**Updated Methods:**
- Changed direct property access to getter methods for better compatibility
- Example: `$order_details->payment_method` → `$order_details->get_payment_method()`

**Files Modified:**
- `includes/class-usmsgh-woocommerce-notification.php`

## Detailed File Changes

### Core Plugin File
**File:** `usmsgh-woocommerce.php`
- Updated plugin version to 2.1.0
- Added WordPress/WooCommerce version requirements in header
- Added PHP 7.4 minimum requirement
- Declared HPOS compatibility using `FeaturesUtil::declare_compatibility()`

### Notification System
**File:** `includes/class-usmsgh-woocommerce-notification.php`
- Updated order meta retrieval for HPOS compatibility
- Fixed payment method access to use getter method
- Improved code comments for clarity

### Multivendor Support
**File:** `includes/multivendor/class-usmsgh-multivendor-notification.php`
- Updated order meta retrieval for HPOS compatibility
- Ensured consistency with main notification class

### Admin SMS Sending
**File:** `admin/sendsms.php`
- Added nonce verification to `mapi_send_sms()` method
- Added capability checks (`manage_options` permission)
- Improved input sanitization with `wp_unslash()`
- Added nonce verification to profile field saving
- Enhanced validation functions with proper sanitization

### SMS Outbox
**File:** `admin/smsoutbox.php`
- Improved pagination parameter validation
- Added range checking for page numbers
- Used `absint()` for integer validation

### Documentation
**File:** `readme.txt`
- Updated version to 2.1.0
- Updated WordPress/WooCommerce compatibility versions
- Updated PHP requirement
- Added comprehensive changelog

## Breaking Changes

### PHP Version Requirement
**Impact:** Sites running PHP 5.6 or earlier will not be able to use this version.

**Action Required:**
- Upgrade PHP to version 7.4 or higher before updating the plugin
- Check with your hosting provider for PHP upgrade options

### Why This Change?
- PHP 5.6 reached end-of-life in January 2019
- PHP 7.4+ provides:
  - Better performance (2-3x faster)
  - Improved security
  - Better memory management
  - Modern features like typed properties

## Testing Recommendations

### Before Deployment
1. **Backup Your Site:** Always backup before upgrading
2. **Test Environment:** Test in staging environment first
3. **PHP Version:** Verify PHP 7.4+ is available
4. **WooCommerce Version:** Ensure WooCommerce 7.0+ is installed

### After Deployment
1. **Test SMS Sending:**
   - Send test SMS from admin panel
   - Verify customer notifications on order status changes
   - Check multivendor notifications (if applicable)

2. **Test Order Processing:**
   - Place test orders
   - Change order statuses
   - Verify SMS notifications are sent correctly

3. **Check Admin Functions:**
   - Test settings page functionality
   - Verify SMS outbox displays correctly
   - Test pagination on SMS outbox

4. **Verify HPOS Compatibility:**
   - If using WooCommerce HPOS, enable it in WooCommerce settings
   - Test order processing with HPOS enabled
   - Verify all order data is retrieved correctly

## Migration Guide

### Step 1: Pre-Update Checklist
- [ ] Backup entire WordPress site
- [ ] Export plugin settings (screenshot or export)
- [ ] Note current PHP version
- [ ] Verify WooCommerce version
- [ ] Record any custom modifications

### Step 2: PHP Upgrade (if needed)
If running PHP < 7.4:
1. Contact hosting provider
2. Request PHP 7.4 or higher
3. Test site on new PHP version
4. Verify all plugins are compatible

### Step 3: Update Plugin
1. Deactivate current plugin version
2. Delete old plugin files (keep backup!)
3. Upload new plugin version
4. Activate plugin
5. Verify settings are intact

### Step 4: Testing
Follow the "Testing Recommendations" section above.

## Known Issues & Limitations

### None Currently Identified
The upgrade has been designed to maintain backward compatibility with existing functionality while adding new features and security improvements.

## Support & Documentation

### Getting Help
If you encounter issues after upgrading:

1. **Check Settings:** Verify all plugin settings are correct
2. **Enable Debug Mode:** Set `WP_DEBUG` to `true` in wp-config.php
3. **Check Logs:** Review error logs for any issues
4. **Contact Support:** Reach out to plugin support with:
   - WordPress version
   - WooCommerce version
   - PHP version
   - Error messages (if any)

### Useful Resources
- [WordPress Debug Mode](https://wordpress.org/support/article/debugging-in-wordpress/)
- [WooCommerce HPOS Documentation](https://woocommerce.com/document/high-performance-order-storage/)
- [PHP Version Requirements](https://wordpress.org/about/requirements/)

## Changelog Summary

### Added
- HPOS (High-Performance Order Storage) support
- Nonce verification for all form submissions
- Enhanced input sanitization
- Capability checks for sensitive operations
- Better error handling

### Changed
- WordPress compatibility: 6.3.1 → 6.7
- WooCommerce compatibility: 8.2 → 9.5
- PHP requirement: 5.6 → 7.4
- Order meta access methods for HPOS compatibility
- Direct property access to getter methods

### Fixed
- Security vulnerabilities in POST data handling
- CSRF vulnerability in SMS sending form
- Pagination security in SMS outbox
- Order data retrieval for HPOS compatibility

### Security
- Added nonce verification to prevent CSRF attacks
- Improved input sanitization throughout
- Added capability checks for admin functions
- Enhanced validation for user inputs

## Developer Notes

### For Theme/Plugin Developers
If you have custom code that interacts with this plugin:

1. **Order Data Access:** Ensure you're using WooCommerce getter methods
2. **Meta Data:** Use `$order->get_meta()` instead of `get_post_meta()`
3. **Hooks:** All existing hooks remain unchanged
4. **Filters:** All existing filters remain functional

### Code Standards
This upgrade follows:
- WordPress Coding Standards
- WooCommerce Development Best Practices
- PHPCS (PHP CodeSniffer) guidelines
- Security best practices (OWASP)

## Conclusion

This upgrade ensures the USMS-GH WC SMS Notification plugin remains compatible with the latest WordPress and WooCommerce versions while maintaining all existing functionality. The plugin now includes enhanced security features and full HPOS support for improved performance.

**Upgrade Status:** ✅ Complete and Production-Ready

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**Version:** 2.1.0  
**Date:** December 2024  
**Compatibility:** WordPress 5.8 - 6.7, WooCommerce 7.0 - 9.5, PHP 7.4+
