HWSConfig.xml

<?xml version="1.0" encoding="utf-8" ?>
<ProxySetting>
  <Context InitContext="[WSCONTEXT]" />
  <PACFile URL="[PACFILE]" />
  <UPDATE URL="http://download.global.blackspider.com/epud/" />
</ProxySetting>

IPXYClientConfiguration.xml

<?xml version="1.0" encoding="UTF-8"?>
<IPXYClientConfiguration SchemaVersion="16777216" SN="0" Name="Default Profile" UpdateDate="" RefId="">
  <ProxySetting>
    <PACFile URL=[PACFILE]"/>
  </ProxySetting>
  <ClientSetting EnableAntiTampering="1" AdminPasswordHash="11a3e229084349bc25d97e29393ced1d">
    <UserInterface UISilentMode="0"/>
    <Update Frequency="0">
      <Download NewVersion="http://download.global.blackspider.com/epud/" SendPII="0"/>
    </Update>
  </ClientSetting>
</IPXYClientConfiguration>

postflight.sh

#!/bin/bash


# test_command
# Found on http://stackoverflow.com/questions/5195607/checking-bash-exit-status-of-several-commands-efficiently
function test_command {
    "$@"
    local status=$?
    echo "Executing '$@'… "
    if [ $status -ne 0 ]; then
        echo "ERROR ($status): $@" >&2
        exit $status
    fi
    echo "OK"
    
}

BASEPATH="/Library/Deploy/EndpointInstaller"

test_command installer -target / -pkg $BASEPATH/WebsenseEndpoint.pkg &> $BASEPATH/websenseinstall.log

# Should have exited with $status before if something failed
#exit 0