Troubleshooting Installation

When you install WHMCS on a server, make sure to watch for errors both during and after the installation process.


Troubleshooting Invoices

Issues with invoices and invoice generation can be due to many causes, some of which may not be obvious at first.


Two-Factor Authentication

Two-Factor Authentication (2FA) enhances security by requiring both a password and a second step like a login code from a mobile device.


Users and Client Accounts

The user management system can grant access for a single client's services, billing, and support to multiple users with separate logins.


Accepting PayPal

WHMCS includes several supported payment gateway modules for accepting payments through PayPal®, including the new PayPal Payments gateway.


Billable Items and Time Billing

Billable items charge clients for custom services, time on projects, or one-time costs, or they can apply custom billing configurations.


Disputes

Disputes, including chargebacks, inquiries, or retrievals, occur when a client contests charges that you collected from their card issuer.