How do you manage Mac offboarding?

I've added this to my script to accomplish exactly what you are trying to do with an erase-install script. You will need to create a service account in your JSS that has permission to update users and computer objects.

#Use Jamfs encrypted parameter tool to log in to JSS
#This is found at https://github.com/jamf/Encrypted-Script-Parameters
function DecryptString() {
    # Usage: ~$ DecryptString "Encrypted String" "Salt" "Passphrase"
    echo "${1}" | /usr/bin/openssl enc -aes256 -d -a -A -S "${2}" -k "${3}"
}

jsspw=$(DecryptString $stringtodecrypt $salt $k)

# Get JSS ID for current computer. 
#get serial number and look up JSS ID  
serial=$(system_profiler SPHardwareDataType | awk '/Serial Number/{print $NF}')
echo "the computers serial is $serial"
computerID=$(curl -sku $jssapiuser:$jsspw $jssurl/JSSResource/computers/serialnumber/$serial -H "Accept: text/xml" -X GET | xmllint --xpath '/computer/general/id/text()' -)
echo "the computers JSS ID is $computerID"


#Unmanage device in JSS
/usr/bin/curl -sku $jssapiuser:$jsspw $jssurl/JSSResource/computers/id/$computerID -H "Content-Type: text/xml" -X PUT -d "<computer><general><remote_management><managed>false</managed></remote_management></general></computer>"
/usr/bin/curl -sku $jssapiuser:$jsspw $jssurl/JSSResource/computercommands/command/UnmanageDevice/id/$computerID -X POST

#Flush All Logs
/usr/local/jamf/bin/jamf flushPolicyHistory

Thanks for your reply! It looks interesting but I will like to avoid to use user API

@yann.palacios If you don't want to use the API you'll need to manually edit the computer record in your Jamf Pro console to mark the machine as unmanaged.