https://developers.whmcs.com/api/authentication/
Authentication - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerauthenticationdocumentation
https://developers.whmcs.com/hooks/
Hooks - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerhooksdocumentation
https://developers.whmcs.com/api/api-index/
API Index - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerapiindexdocumentation
https://developers.whmcs.com/themes/
Themes - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerthemesdocumentation
https://developers.whmcs.com/api/response-types/
Response Types - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerresponsetypesdocumentation
https://developers.whmcs.com/about/contribute/
Contribute - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developercontributedocumentation
https://developers.whmcs.com/about/quick-start/
Quick Start - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
quick startwhmcs developerdocumentation
https://developers.whmcs.com/hooks-reference/
Hooks Reference - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
whmcs developerhooksreferencedocumentation
https://developers.whmcs.com/about/faq/
Frequently Asked Questions - WHMCS Developer Documentation
WHMCS developer documentation - themes, modules, hooks, oauth, api and more...
frequently asked questionswhmcs developerdocumentation
https://whmcs.community/topic/353314-whmcs-90-%E2%80%93-upcoming-changes-to-module-requirements/
WHMCS 9.0 – Upcoming Changes to Module Requirements - Developer Corner - WHMCS.Community
Dec 23, 2025 - Hi WHMCS ecosystem developers! I am excited to share an early heads-up about the upcoming WHMCS 9.0 release by the end of 2025 - a major update that brings...
upcoming changeswhmcsmodulerequirementsdeveloper