: A completely free, open-source module available on GitHub . It supports Meta Cloud API, Evolution API, and Baileys, allowing you to send notifications for overdue invoices, product orders, and more.
Many SMS providers (like Twilio, Vonage, or MessageBird) provide their own WHMCS modules for free. Since they make money on the message volume, they want you to use their software securely. Secure, supported, and professional. Cons: Requires a small budget for messaging credits. 3. Automation via Zapier or Pabbly whmcs whatsapp notification module nulled free