Custom fields in WHMCS allow you to add additional data fields to client profiles, services, and invoices.
WHMCS supports a robust hooks system that allows you to trigger custom actions based on certain events.
WHMCS provides a Module Development Kit (MDK) which includes documentation and tools necessary to create custom modules.
This includes customizing the client area with your branding, providing easy-to-use interfaces, and ensuring clients have access to the features they need.
Customizable modules can help you enhance security by implementing additional authentication methods, logging and monitoring tools, and automated security checks.
This includes applying patches, updates from module developers, and making sure custom code is compatible with new versions of WHMCS.