Notes from real client work
Hard-won lessons from shipping WHMCS modules, securing servers, and automating hosting businesses - written so you can apply them today.
WHMCS already creates cPanel accounts. The hook that adds DNS auto-config, CRM push, Slack notifications, fraud screening — all the cross-cutting work the module doesn't do.
Every WHMCS theme tutorial shows the file tree and stops there. This one shows the decisions that determine whether your theme survives the next WHMCS update — inheritance, Smarty essentials, when to use hooks instead of templates.
The five WHMCS module types — provisioning, addon, gateway, registrar, reports — and a decision tree for picking the right one. With boilerplate for each.
WHMCS client area looks like a billing system. The customization that pays back: faster paths to common tasks, a dashboard that surfaces what matters, mobile-ready UI.
Stop editing WHMCS core files. After 10+ years building WHMCS systems, here is the working model for hooks — the 7 you will actually use, a real walkthrough, and the pitfalls that have cost me nights of sleep.
The WHMCS API turns a billing app into a platform. The 15 commands I actually use, authentication done right, real signup-from-external-site example, and the pagination/error patterns for production code.
The complete model for building production-quality WHMCS provisioning modules. The contract, the params array, idempotency rules, and the patterns that prevent 90% of incidents I have seen in 200+ modules.
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