Developer Resources

Resources for developers including how-to guides, api documentation and code samples.

Modules

Extend WHMCS functionality by creating a module.

Create a module
Code Samples (Github)

Hooks

Tie into events as they occur inside WHMCS.

Hooks Overview
Hook Directory

API

Interact with WHMCS from custom code & third party applications.

API Overview Sample Code Function Directory Internal API

Templates

Design and develop custom themes.

Customising WHMCS Template Language/Syntax Reference Client Area Admin Area Order Forms PDF Invoice

OAuth/OpenID

APIs for Authenticating with WHMCS

WHMCS Single Sign-On OpenID Connect

Reference Docs

The following articles are available for reference.

Internal Functions Interacting with the Database Creating Your Own Pages Language Files

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