Invoice and quote PDF files use a template file system. If you use a self-hosted WHMCS installation, you can use this templated system to customize your PDF invoices and quotes.
WHMCS's email templates determine the contents of the email messages that your WHMCS installation sends to your customers. You can customize all of WHMCS's included email templates or create your own Smarty email template files.
You can translate the name, description, and other text for your products. This allows you to provide custom localization and display your product information in your customer's chosen language.