We support many different ways to customize your WHMCS installation, all of which have their own troubleshooting needs.
While developing your own custom code, you may need to test and troubleshoot your implementation of the WHMCS hook system.
Troubleshooting system themes requires specific steps.
During the development process, you may need to verify whether your API code is working correctly.
Troubleshoot and resolve duplicate system themes appearing in the System Theme menu.
Troubleshoot and resolve LogicException: The template could not be found errors.
Troubleshoot and resolve issues with missing countries.json file customizations.