/var/www/whmcs/modules/notificationsassuming the root folder of your WHMCS installation is
Here you go! :)
The best place to start if you need help with a specific product is to contact the developer. All WHMCS Marketplace developers have both a website and support URL listed.
A simplistic, free & open source hook allowing instant Discord notifications when an action is triggered.
Netgsm Sms addon provides you sending customized bulk sms and creating sms templates.
MSG91 WHMCS SMS plugin gives you the power and flexibility to stay connected with your customers by sending them an SMS and OTP's for 2FA at the crucial steps that matters the most.
More Advanced SMS System (Two-Factor Authentication)
Transactional email support for Sendgrid, Mailgun, Postmark, Sendinblue (Brevo), Mailjet, Sparkpost, Mandrill, AmazonSES, postalserver