To install backend notification processes you need to add
cron_email_notification.php and cron_sms_notification.php in system crontab to run
every hour.

 To set the sms/email engine use the frontend Admin->Batchcom->Sms/email
notifications settings and adjust interface/globals.php accordingly.

 Also need to comment out the exit command from the beginning of the scripts.

 2022-04-03 Luis Note: It only works to send email.