Icall script argument

Hello!

How I can translate to icall script argument from APM via iRule? Example. I want generate user certificate SSL via APM. I wrote bash script, but it should be called with two argument - UserName and UserDomain.

Thank you!

sys icall script gcc_script {

app-service none
definition {
    exec /home/root/scripts/certificates.sh $UserDN $DomainDN
    exec istats remove "GCC generate for UserDN"
}
description none
events none

}