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CHANGELOG.md

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+# Changelog
+
+All notable changes to the TeaSpeak WHMCS Module will be documented in this file.
+
+## [3.0.0] - 2024 - Updated Edition
+
+**Updated by:** Kevin Feiler / AVVGO
+
+### Added
+- PHP 8.x compatibility (8.0, 8.1, 8.2, 8.3)
+- WHMCS API 1.2 support
+- Strict type declarations (`declare(strict_types=1)`)
+- Type hints for all function parameters and return types
+- Modern array syntax (`[]` instead of `array()`)
+- Bootstrap 5 template option (`overview_modern.tpl`)
+- Font Awesome 6 icon support
+- Comprehensive code documentation
+- Author credits and version information in file headers
+
+### Changed
+- Updated to modern PHP syntax throughout
+- Improved error handling and messages
+- Better input validation
+- Enhanced security practices
+- Optimized database queries
+- Removed hardcoded URLs
+- Improved code structure and readability
+- Updated README with detailed installation and upgrade instructions
+
+### Improved
+- Mobile responsiveness in templates
+- User experience with better UI design
+- Code maintainability
+- Performance optimizations
+- Error logging and debugging capabilities
+
+### Fixed
+- Various bugs and edge cases
+- Deprecated PHP syntax
+- Security vulnerabilities
+- Code consistency issues
+
+---
+
+## [2.1.4] - Previous Version
+
+**Original Author:** planetteaspeak.de
+
+### Features
+- TeamSpeak server provisioning
+- Client area management
+- Token/Privileges management
+- Ban management
+- Backup functionality
+- TSDNS integration
+- Bootstrap 3 design
+- PHP 7.x compatibility
+- WHMCS API 1.1
+
+---
+
+**Note:** This changelog covers the major update from version 2.1.4 to 3.0.0. The update focuses on modernization, compatibility, and code quality improvements while maintaining backward compatibility with existing installations.