Troubleshoot and resolve Legacy Smarty Tags errors.
To promote better security, we plan to move to Smarty 4, which is not compatible with SmartyBC, in the near future. If you use certain Smarty tags, you must remove them now.
We plan to permanently remove support for legacy Smarty tags in WHMCS 9.0. You must remove these tags from your customizations.
Troubleshoot and resolve Smarty Error: Not allowed by security policy errors.
Smarty Security Policies are security hardening measures that protect a system. WHMCS applies a Smarty Security Policy for system-wide use and a mail policy for stored and dynamic email-based templates.