Send SMS from WHMCS plugin of MsgClub
MsgClub WHMCS SMS plugin enables you to send SMS messages automatically to all clients' mobile numbers on certain activities like client login, message for new invoice, overdue invoice, password change etc. Our bulk sms addon also allows business owners to provide two-factor authentication to their customers and admins upon login and before accessing the client area where they need to enter the verification code sent on mobile number.