- Updated WHMCS service methods to return normalized product types, enhancing type consistency across services.
- Refactored product retrieval logic in WhmcsPaymentService and WhmcsService to streamline data handling.
- Removed deprecated utility functions and optimized custom field handling in WHMCS-related services.
- Enhanced error handling in subscription processing to improve reliability and clarity.
- Cleaned up imports and improved overall code organization for better maintainability.
