By default, Nagios can send emails to registered contact. Fortunately, there is also a contact property names pager which can be used very conveniently. Two things have to be added to your nagios config in order to reveice the Nagios notifications via DAPNET.

Edit commands.cfg and add the following lines:

# 'notify-host-by-pager' command definition
define command{
        command_name    notify-host-by-pager
        command_line    /usr/bin/curl -H "Content-Type: application/json" -X POST -u $USER12$:$USER13$ -d '{ "text": "NAGIOS $NOTIFICATIONTYPE$: $HOSTNAME$ $$
        }

# 'notify-service-by-pager' command definition
define command{
        command_name    notify-service-by-pager
        command_line    /usr/bin/curl -H "Content-Type: application/json" -X POST -u $USER12$:$USER13$ -d '{ "text": "NAGIOS $NOTIFICATIONTYPE$: $HOSTNAME$ $$
        }

As you see, there are macros $USER12$ and $USER13$ used. They should contain your DAPNET username and password. Define them in the resource.cfg:

$USER12$=dl1abc
$USER13$=VERYSCECRETPASSWORD