- Created a new `user_roles.php` file for managing user roles and permissions.
- Implemented pagination, filtering, and sorting for user roles.
- Updated `users.php` to use the new authorization structure for permissions.
- Changed API version from v1 to v2 in `users.php` for user data retrieval.
- Modified `webhook_mollie.php` to include account hierarchy in license creation.
- Refactored invoice generation and email sending logic in `webhook_mollie.php`.
- Introduced a new `webhook_paypal.php` file to handle PayPal webhook notifications.
- Implemented payment status updates and license creation logic in `webhook_paypal.php`.
- Added helper functions for PayPal webhook signature verification and access token retrieval.
- Added invoice generation logic using DomPDF.
- Integrated invoice data retrieval from the API.
- Implemented language determination for invoices based on customer data.
- Added options to email invoices to customers and admin.
- Included HTML output option for direct viewing in the browser.
- Ensured proper redirection and error handling throughout the process.
- Added software.php for managing software versions, including download and purchase actions.
- Created upgrade_paths.php for handling upgrade paths management.
- Developed user_licenses.php for managing user licenses.
- Introduced version_access_rules.php for managing access rules for software versions.
- Implemented frontend functions in functions.js for interacting with the software upgrade API.
- Added version_access.php for user access validation and license management.
- Created upgrades.php for displaying available upgrades and handling user interactions.
- Enhanced UI with responsive design and progress indicators for downloads and purchases.
