# Billing System
After enabling Background Billing in the Configuration section, you need to set up a billing system integration to connect your PanelAlpha installation with your billing platform.
# Available Integrations
Currently, PanelAlpha supports the following billing system integration:
# WHMCS Integration
To integrate with WHMCS:
- Select "WHMCS" from the integration type dropdown
- Enter your WHMCS URL (the full URL to your WHMCS installation)
- Enter your WHMCS API Token
Note: The WHMCS API Token must be configured properly in your WHMCS installation's Addon Modules section, where you need to generate a key. For detailed instructions on setting up the required API permissions, please refer to the WHMCS Integration Guide.
- Click "Test Connection" to verify that PanelAlpha can successfully communicate with your WHMCS installation
Once configured, PanelAlpha will be able to communicate with your WHMCS installation to handle billing operations in the background.