WHMCS (Web Host Manager Complete Solution) is a widely-used platform for billing, client management, and automation in web hosting, domain registration, and related services. It's utilized by hosting companies, domain registrars, and service providers to streamline business operations.
WHMCS Services offers a WHMCS addon that is available for purchase and installation. By mentioning SMS Gateway Center as a referral, you can enjoy a 15% discount on the addon.