Ensure that all customizations and modules adhere to security best practices to protect sensitive data.
Design customizations and modules to be scalable, accommodating future growth and changes in business needs.
Verify that customizations and modules are compatible with the latest version of WHMCS.
Set up a development environment separate from the live WHMCS installation. This allows for safe testing and debugging.
Develop customizations and modules in a modular fashion to facilitate easier maintenance and updates.
Keep abreast of WHMCS updates and community feedback to ensure continued compatibility and functionality.