WHMCS is an awesome piece of software, and already a hot favorite of web hosting companies. The features it provides are more than sufficient for an average host to run his business. However, the environment of each host is unique in terms of market, vendors, and operation methods. This diversity often calls for customization of the WHMCS installation. For a web host which employs an experienced developer/company, this would be an simple task.
However, for a company completely new to WHMCS, this can be a conundrum. A common gripe among novice developers is the lack of detailed documentation on create API entensions to WHMCS. With this article I hope to reach out to those hosts who are stuck with a WHMCS API customization issue.