Browsing articles in "API"

How to check existing client in WHMCS by email

Native WHMCS API allows us to register clients, but not to check if certain email is already in use. So this tiny function will help you to determine do you already have this client in your DB.

Introduction to custom WHMCS API functions

Are you not satisfied with default WHMCS API functions? In this little note I introduce you a very basic template for a custom API function.