Products set details like pricing, billing cycles, recommendations, provisioning modules, and other options for each item you sell.
Problems with your system email can prevent you from sending email to clients or connecting to your mail provider.
Product addons let you offer additional items for sale alongside a specific parent product but bill for them on a separate billing cycle.
The Products/Services tab in the Client Profile lets you view and manage client services.
The Auto Release module can automate tasks for products without an associated module.
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.
Troubleshoot and resolve No recipients provided for message errors.