Cookies maintain session state and store small amounts of data while users interact with WHMCS.
A custom countries.json file can add, change, or remove the countries that appear in menus within WHMCS and their calling codes.
The Credit tab in General Settings allows you to enable and configure the credit system. Credit allows you to receive money from a client, record it, and apply that balance to the client's purchases.
Custom fields collect additional information from or about your clients. You can set them as admin-only or make them visible to clients.
Modules in WHMCS use templates to define what users see. You can customize these module templates using WHMCS's overrides system.
Order form templates define the look and feel of the shopping cart when your customers view products, register domains, and place orders.
You can easily modify WHMCS's default reports or create your own custom new reports in the /modules/reports/ directory.